src/: Replace GPL boilerplate with SPDX headers

Used commands:
perl -i -p0e 's|\/\*[\s*]*.*is free software[:;][\s*]*you[\s*]*can[\s*]*redistribute[\s*]*it[\s*]*and\/or[\s*]*modify[\s*]*it[\s*]*under[\s*]*the[\s*]*terms[\s*]*of[\s*]*the[\s*]*GNU[\s*]*General[\s*]*Public[\s*]*License[\s*]*as[\s*]*published[\s*]*by[\s*]*the[\s*]*Free[\s*]*Software[\s*]*Foundation[;,][\s*]*version[\s*]*2[\s*]*of[\s*]*the[\s*]*License.[\s*]*This[\s*]*program[\s*]*is[\s*]*distributed[\s*]*in[\s*]*the[\s*]*hope[\s*]*that[\s*]*it[\s*]*will[\s*]*be[\s*]*useful,[\s*]*but[\s*]*WITHOUT[\s*]*ANY[\s*]*WARRANTY;[\s*]*without[\s*]*even[\s*]*the[\s*]*implied[\s*]*warranty[\s*]*of[\s*]*MERCHANTABILITY[\s*]*or[\s*]*FITNESS[\s*]*FOR[\s*]*A[\s*]*PARTICULAR[\s*]*PURPOSE.[\s*]*See[\s*]*the[\s*]*GNU[\s*]*General[\s*]*Public[\s*]*License[\s*]*for[\s*]*more[\s*]*details.[\s*]*\*\/|/* SPDX-License-Identifier: GPL-2.0-only */|' $(cat filelist)

perl -i -p0e 's|\/\*[\s*]*.*is[\s*]*free[\s*]*software[:;][\s*]*you[\s*]*can[\s*]*redistribute[\s*]*it[\s*]*and/or[\s*]*modify[\s*]*it[\s*]*under[\s*]*the[\s*]*terms[\s*]*of[\s*]*the[\s*]*GNU[\s*]*General[\s*]*Public[\s*]*License[\s*]*as[\s*]*published[\s*]*by[\s*]*the[\s*]*Free[\s*]*Software[\s*]*Foundation[;,][\s*]*either[\s*]*version[\s*]*2[\s*]*of[\s*]*the[\s*]*License,[\s*]*or[\s*]*.at[\s*]*your[\s*]*option.[\s*]*any[\s*]*later[\s*]*version.[\s*]*This[\s*]*program[\s*]*is[\s*]*distributed[\s*]*in[\s*]*the[\s*]*hope[\s*]*that[\s*]*it[\s*]*will[\s*]*be[\s*]*useful,[\s*]*but[\s*]*WITHOUT[\s*]*ANY[\s*]*WARRANTY;[\s*]*without[\s*]*even[\s*]*the[\s*]*implied[\s*]*warranty[\s*]*of[\s*]*MERCHANTABILITY[\s*]*or[\s*]*FITNESS[\s*]*FOR[\s*]*A[\s*]*PARTICULAR[\s*]*PURPOSE.[\s*]*See[\s*]*the[\s*]*GNU[\s*]*General[\s*]*Public[\s*]*License[\s*]*for[\s*]*more[\s*]*details.[\s*]*\*\/|/* SPDX-License-Identifier: GPL-2.0-or-later */|' $(cat filelist)

perl -i -p0e 's|\/\*[\s*]*.*is[\s*#]*free[\s*#]*software[;:,][\s*#]*you[\s*#]*can[\s*#]*redistribute[\s*#]*it[\s*#]*and/or[\s*#]*modify[\s*#]*it[\s*#]*under[\s*#]*the[\s*#]*terms[\s*#]*of[\s*#]*the[\s*#]*GNU[\s*#]*General[\s*#]*Public[\s*#]*License[\s*#]*as[\s*#]*published[\s*#]*by[\s*#]*the[\s*#]*Free[\s*#]*Software[\s*#]*Foundation[;:,][\s*#]*either[\s*#]*version[\s*#]*3[\s*#]*of[\s*#]*the[\s*#]*License[;:,][\s*#]*or[\s*#]*.at[\s*#]*your[\s*#]*option.[\s*#]*any[\s*#]*later[\s*#]*version.[\s*#]*This[\s*#]*program[\s*#]*is[\s*#]*distributed[\s*#]*in[\s*#]*the[\s*#]*hope[\s*#]*that[\s*#]*it[\s*#]*will[\s*#]*be[\s*#]*useful[;:,][\s*#]*but[\s*#]*WITHOUT[\s*#]*ANY[\s*#]*WARRANTY[;:,][\s*#]*without[\s*#]*even[\s*#]*the[\s*#]*implied[\s*#]*warranty[\s*#]*of[\s*#]*MERCHANTABILITY[\s*#]*or[\s*#]*FITNESS[\s*#]*FOR[\s*#]*A[\s*#]*PARTICULAR[\s*#]*PURPOSE.[\s*#]*See[\s*#]*the[\s*#]*GNU[\s*#]*General[\s*#]*Public[\s*#]*License[\s*#]*for[\s*#]*more[\s*#]*details.[\s*]*\*\/|/* SPDX-License-Identifier: GPL-3.0-or-later */|' $(cat filelist)

perl -i -p0e 's|(\#\#*)[\w]*.*is free software[:;][\#\s]*you[\#\s]*can[\#\s]*redistribute[\#\s]*it[\#\s]*and\/or[\#\s]*modify[\#\s]*it[\s\#]*under[\s \#]*the[\s\#]*terms[\s\#]*of[\s\#]*the[\s\#]*GNU[\s\#]*General[\s\#]*Public[\s\#]*License[\s\#]*as[\s\#]*published[\s\#]*by[\s\#]*the[\s\#]*Free[\s\#]*Software[\s\#]*Foundation[;,][\s\#]*version[\s\#]*2[\s\#]*of[\s\#]*the[\s\#]*License.*[\s\#]*This[\s\#]*program[\s\#]*is[\s\#]*distributed[\s\#]*in[\s\#]*the[\s\#]*hope[\s\#]*that[\s\#]*it[\s\#]*will[\#\s]*be[\#\s]*useful,[\#\s]*but[\#\s]*WITHOUT[\#\s]*ANY[\#\s]*WARRANTY;[\#\s]*without[\#\s]*even[\#\s]*the[\#\s]*implied[\#\s]*warranty[\#\s]*of[\#\s]*MERCHANTABILITY[\#\s]*or[\#\s]*FITNESS[\#\s]*FOR[\#\s]*A[\#\s]*PARTICULAR[\#\s]*PURPOSE.[\#\s]*See[\#\s]*the[\#\s]*GNU[\#\s]*General[\#\s]*Public[\#\s]*License[\#\s]*for[\#\s]*more[\#\s]*details.\s(#* *\n)*|\1 SPDX-License-Identifier: GPL-2.0-only\n\n|' $(cat filelist)

perl -i -p0e 's|(\#\#*)[\w*]*.*is free software[:;][\s*]*you[\s*]*can[\s*]*redistribute[\s*]*it[\s*]*and\/or[\s*]*modify[\s*]*it[\s*]*under[\s*]*the[\s*]*terms[\s*]*of[\s*]*the[\s*]*GNU[\s*]*General[\s*]*Public[\s*]*License[\s*]*as[\s*]*published[\s*]*by[\s*]*the[\s*]*Free[\s*]*Software[\s*]*Foundation[;,][\s*]*version[\s*]*2[\s*]*of[\s*]*the[\s*]*License.[\s*]*This[\s*]*program[\s*]*is[\s*]*distributed[\s*]*in[\s*]*the[\s*]*hope[\s*]*that[\s*]*it[\s*]*will[\s*]*be[\s*]*useful,[\s*]*but[\s*]*WITHOUT[\s*]*ANY[\s*]*WARRANTY;[\s*]*without[\s*]*even[\s*]*the[\s*]*implied[\s*]*warranty[\s*]*of[\s*]*MERCHANTABILITY[\s*]*or[\s*]*FITNESS[\s*]*FOR[\s*]*A[\s*]*PARTICULAR[\s*]*PURPOSE.[\s*]*See[\s*]*the[\s*]*GNU[\s*]*General[\s*]*Public[\s*]*License[\s*]*for[\s*]*more[\s*]*details.\s(#* *\n)*|\1 SPDX-License-Identifier: GPL-2.0-only\n\n|' $(cat filelist)

Change-Id: Ia01908544f4b92a2e06ea621eca548e582728280
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41178
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

175 files changed, 184 insertions, 1572 deletions

diff --git a/src/mainboard/google/Kconfig b/src/mainboard/google/Kconfig
index 475668d428..d5345a45f1 100644
--- a/src/mainboard/google/Kconfig
+++ b/src/mainboard/google/Kconfig
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 if VENDOR_GOOGLE
 
diff --git a/src/mainboard/google/auron/Makefile.inc b/src/mainboard/google/auron/Makefile.inc
index 2fbfe30789..93e20a3da5 100644
--- a/src/mainboard/google/auron/Makefile.inc
+++ b/src/mainboard/google/auron/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 ramstage-$(CONFIG_EC_GOOGLE_CHROMEEC) += ec.c
 
diff --git a/src/mainboard/google/auron/cmos.layout b/src/mainboard/google/auron/cmos.layout
index 014f442651..6e04c5b225 100644
--- a/src/mainboard/google/auron/cmos.layout
+++ b/src/mainboard/google/auron/cmos.layout
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 # -----------------------------------------------------------------
 entries
diff --git a/src/mainboard/google/auron/variants/auron_paine/spd/Makefile.inc b/src/mainboard/google/auron/variants/auron_paine/spd/Makefile.inc
index 9e2c76af8f..c797c58840 100644
--- a/src/mainboard/google/auron/variants/auron_paine/spd/Makefile.inc
+++ b/src/mainboard/google/auron/variants/auron_paine/spd/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += spd.c
 
diff --git a/src/mainboard/google/auron/variants/auron_yuna/spd/Makefile.inc b/src/mainboard/google/auron/variants/auron_yuna/spd/Makefile.inc
index 9e2c76af8f..c797c58840 100644
--- a/src/mainboard/google/auron/variants/auron_yuna/spd/Makefile.inc
+++ b/src/mainboard/google/auron/variants/auron_yuna/spd/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += spd.c
 
diff --git a/src/mainboard/google/auron/variants/buddy/spd/Makefile.inc b/src/mainboard/google/auron/variants/buddy/spd/Makefile.inc
index cc9726f5fb..e3b4cfdfc2 100644
--- a/src/mainboard/google/auron/variants/buddy/spd/Makefile.inc
+++ b/src/mainboard/google/auron/variants/buddy/spd/Makefile.inc
@@ -2,14 +2,6 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += spd.c
diff --git a/src/mainboard/google/auron/variants/gandof/spd/Makefile.inc b/src/mainboard/google/auron/variants/gandof/spd/Makefile.inc
index 8b387816bb..2bfc42f50b 100644
--- a/src/mainboard/google/auron/variants/gandof/spd/Makefile.inc
+++ b/src/mainboard/google/auron/variants/gandof/spd/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += spd.c
 
diff --git a/src/mainboard/google/auron/variants/lulu/spd/Makefile.inc b/src/mainboard/google/auron/variants/lulu/spd/Makefile.inc
index b29e8766aa..9c824e67ba 100644
--- a/src/mainboard/google/auron/variants/lulu/spd/Makefile.inc
+++ b/src/mainboard/google/auron/variants/lulu/spd/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += spd.c
 
diff --git a/src/mainboard/google/auron/variants/samus/Makefile.inc b/src/mainboard/google/auron/variants/samus/Makefile.inc
index 6e776fff65..6704fe349e 100644
--- a/src/mainboard/google/auron/variants/samus/Makefile.inc
+++ b/src/mainboard/google/auron/variants/samus/Makefile.inc
@@ -1,15 +1,7 @@
 ##
 ## This file is part of the coreboot project.
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += board_version.c
 ramstage-y += board_version.c
diff --git a/src/mainboard/google/auron/variants/samus/spd/Makefile.inc b/src/mainboard/google/auron/variants/samus/spd/Makefile.inc
index f57e9e7688..60c822baee 100644
--- a/src/mainboard/google/auron/variants/samus/spd/Makefile.inc
+++ b/src/mainboard/google/auron/variants/samus/spd/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += spd.c
 
diff --git a/src/mainboard/google/beltino/Makefile.inc b/src/mainboard/google/beltino/Makefile.inc
index bb9bf7f19f..190840e780 100644
--- a/src/mainboard/google/beltino/Makefile.inc
+++ b/src/mainboard/google/beltino/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-$(CONFIG_CHROMEOS) += chromeos.c
 ramstage-$(CONFIG_CHROMEOS) += chromeos.c
diff --git a/src/mainboard/google/beltino/cmos.layout b/src/mainboard/google/beltino/cmos.layout
index 014f442651..6e04c5b225 100644
--- a/src/mainboard/google/beltino/cmos.layout
+++ b/src/mainboard/google/beltino/cmos.layout
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 # -----------------------------------------------------------------
 entries
diff --git a/src/mainboard/google/butterfly/Makefile.inc b/src/mainboard/google/butterfly/Makefile.inc
index 202cb38cfd..a34a7153de 100644
--- a/src/mainboard/google/butterfly/Makefile.inc
+++ b/src/mainboard/google/butterfly/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 ramstage-y += ec.c
 
diff --git a/src/mainboard/google/butterfly/cmos.layout b/src/mainboard/google/butterfly/cmos.layout
index 8bafde2b35..99844b3a59 100644
--- a/src/mainboard/google/butterfly/cmos.layout
+++ b/src/mainboard/google/butterfly/cmos.layout
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 # -----------------------------------------------------------------
 entries
diff --git a/src/mainboard/google/cheza/Makefile.inc b/src/mainboard/google/cheza/Makefile.inc
index 8c621a1f74..e1f6aea5d8 100644
--- a/src/mainboard/google/cheza/Makefile.inc
+++ b/src/mainboard/google/cheza/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += boardid.c
 bootblock-y += memlayout.ld
diff --git a/src/mainboard/google/cyan/Makefile.inc b/src/mainboard/google/cyan/Makefile.inc
index d9b15c78d5..014b422a49 100644
--- a/src/mainboard/google/cyan/Makefile.inc
+++ b/src/mainboard/google/cyan/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-$(CONFIG_ENABLE_BUILTIN_COM1) += com_init.c
 
diff --git a/src/mainboard/google/cyan/cmos.layout b/src/mainboard/google/cyan/cmos.layout
index a0edabdccb..1e3aa17b82 100644
--- a/src/mainboard/google/cyan/cmos.layout
+++ b/src/mainboard/google/cyan/cmos.layout
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 # -----------------------------------------------------------------
 entries
diff --git a/src/mainboard/google/cyan/variants/banon/Makefile.inc b/src/mainboard/google/cyan/variants/banon/Makefile.inc
index 273895f5a5..1d62f5305e 100644
--- a/src/mainboard/google/cyan/variants/banon/Makefile.inc
+++ b/src/mainboard/google/cyan/variants/banon/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += romstage.c
 romstage-y += spd_util.c
diff --git a/src/mainboard/google/cyan/variants/celes/Makefile.inc b/src/mainboard/google/cyan/variants/celes/Makefile.inc
index 839647463a..ab337db505 100644
--- a/src/mainboard/google/cyan/variants/celes/Makefile.inc
+++ b/src/mainboard/google/cyan/variants/celes/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += spd_util.c
 
diff --git a/src/mainboard/google/cyan/variants/cyan/Makefile.inc b/src/mainboard/google/cyan/variants/cyan/Makefile.inc
index da6f751fc9..f6beccca96 100644
--- a/src/mainboard/google/cyan/variants/cyan/Makefile.inc
+++ b/src/mainboard/google/cyan/variants/cyan/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += spd_util.c
 
diff --git a/src/mainboard/google/cyan/variants/edgar/Makefile.inc b/src/mainboard/google/cyan/variants/edgar/Makefile.inc
index 5c80941095..aea356668b 100644
--- a/src/mainboard/google/cyan/variants/edgar/Makefile.inc
+++ b/src/mainboard/google/cyan/variants/edgar/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += romstage.c
 romstage-y += spd_util.c
diff --git a/src/mainboard/google/cyan/variants/kefka/Makefile.inc b/src/mainboard/google/cyan/variants/kefka/Makefile.inc
index 9153eb43f2..7de96cfedd 100644
--- a/src/mainboard/google/cyan/variants/kefka/Makefile.inc
+++ b/src/mainboard/google/cyan/variants/kefka/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += romstage.c
 romstage-y += spd_util.c
diff --git a/src/mainboard/google/cyan/variants/reks/Makefile.inc b/src/mainboard/google/cyan/variants/reks/Makefile.inc
index 42097b0acc..3f07ef6038 100644
--- a/src/mainboard/google/cyan/variants/reks/Makefile.inc
+++ b/src/mainboard/google/cyan/variants/reks/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += romstage.c
 romstage-y += spd_util.c
diff --git a/src/mainboard/google/cyan/variants/relm/Makefile.inc b/src/mainboard/google/cyan/variants/relm/Makefile.inc
index 199295d4d8..52dbe952b9 100644
--- a/src/mainboard/google/cyan/variants/relm/Makefile.inc
+++ b/src/mainboard/google/cyan/variants/relm/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += romstage.c
 romstage-y += spd_util.c
diff --git a/src/mainboard/google/cyan/variants/setzer/Makefile.inc b/src/mainboard/google/cyan/variants/setzer/Makefile.inc
index 66b666cdea..cc95d87d7f 100644
--- a/src/mainboard/google/cyan/variants/setzer/Makefile.inc
+++ b/src/mainboard/google/cyan/variants/setzer/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += romstage.c
 romstage-y += spd_util.c
diff --git a/src/mainboard/google/cyan/variants/terra/Makefile.inc b/src/mainboard/google/cyan/variants/terra/Makefile.inc
index 23a7c4166a..f00a49574e 100644
--- a/src/mainboard/google/cyan/variants/terra/Makefile.inc
+++ b/src/mainboard/google/cyan/variants/terra/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += romstage.c
 romstage-y += spd_util.c
diff --git a/src/mainboard/google/cyan/variants/ultima/Makefile.inc b/src/mainboard/google/cyan/variants/ultima/Makefile.inc
index 19acf48e47..4ba464bf77 100644
--- a/src/mainboard/google/cyan/variants/ultima/Makefile.inc
+++ b/src/mainboard/google/cyan/variants/ultima/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += spd_util.c
 
diff --git a/src/mainboard/google/cyan/variants/wizpig/Makefile.inc b/src/mainboard/google/cyan/variants/wizpig/Makefile.inc
index 5ba9b840d9..f7c614bf71 100644
--- a/src/mainboard/google/cyan/variants/wizpig/Makefile.inc
+++ b/src/mainboard/google/cyan/variants/wizpig/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += spd_util.c
 
diff --git a/src/mainboard/google/daisy/Kconfig b/src/mainboard/google/daisy/Kconfig
index dc54f916b4..2b81959a45 100644
--- a/src/mainboard/google/daisy/Kconfig
+++ b/src/mainboard/google/daisy/Kconfig
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 if BOARD_GOOGLE_DAISY
 
diff --git a/src/mainboard/google/daisy/Makefile.inc b/src/mainboard/google/daisy/Makefile.inc
index fd76686e40..32046b1d4a 100644
--- a/src/mainboard/google/daisy/Makefile.inc
+++ b/src/mainboard/google/daisy/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += wakeup.c
 
diff --git a/src/mainboard/google/daisy/devicetree.cb b/src/mainboard/google/daisy/devicetree.cb
index aeb2fc8f2f..90b0764c1d 100644
--- a/src/mainboard/google/daisy/devicetree.cb
+++ b/src/mainboard/google/daisy/devicetree.cb
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 chip soc/samsung/exynos5250
 	device cpu_cluster 0 on end
diff --git a/src/mainboard/google/dragonegg/Makefile.inc b/src/mainboard/google/dragonegg/Makefile.inc
index 7773477da1..da0ea062f1 100644
--- a/src/mainboard/google/dragonegg/Makefile.inc
+++ b/src/mainboard/google/dragonegg/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += bootblock.c
 bootblock-$(CONFIG_CHROMEOS) += chromeos.c
diff --git a/src/mainboard/google/dragonegg/spd/Makefile.inc b/src/mainboard/google/dragonegg/spd/Makefile.inc
index 7aaf00da40..22382378f9 100644
--- a/src/mainboard/google/dragonegg/spd/Makefile.inc
+++ b/src/mainboard/google/dragonegg/spd/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_BIN = $(obj)/spd.bin
 
diff --git a/src/mainboard/google/dragonegg/variants/baseboard/Makefile.inc b/src/mainboard/google/dragonegg/variants/baseboard/Makefile.inc
index 7a3ce63467..c0fea914d8 100644
--- a/src/mainboard/google/dragonegg/variants/baseboard/Makefile.inc
+++ b/src/mainboard/google/dragonegg/variants/baseboard/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += gpio.c
 
diff --git a/src/mainboard/google/drallion/Makefile.inc b/src/mainboard/google/drallion/Makefile.inc
index d45b53a8cc..3b76abd5be 100644
--- a/src/mainboard/google/drallion/Makefile.inc
+++ b/src/mainboard/google/drallion/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += bootblock.c
 
diff --git a/src/mainboard/google/drallion/spd/Makefile.inc b/src/mainboard/google/drallion/spd/Makefile.inc
index 4b400761f3..b901fa54cf 100644
--- a/src/mainboard/google/drallion/spd/Makefile.inc
+++ b/src/mainboard/google/drallion/spd/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_BIN = $(obj)/spd.bin
 
diff --git a/src/mainboard/google/drallion/variants/drallion/Makefile.inc b/src/mainboard/google/drallion/variants/drallion/Makefile.inc
index 8c9fc57e58..4716a6f12f 100644
--- a/src/mainboard/google/drallion/variants/drallion/Makefile.inc
+++ b/src/mainboard/google/drallion/variants/drallion/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 ## GPP_F12-F16 indicates mem_id to match specific spd file
 SPD_SOURCES = empty_ddr4	# 0b00000
diff --git a/src/mainboard/google/eve/Makefile.inc b/src/mainboard/google/eve/Makefile.inc
index f9be75a94e..b3a874b93e 100644
--- a/src/mainboard/google/eve/Makefile.inc
+++ b/src/mainboard/google/eve/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 subdirs-y += spd
 
diff --git a/src/mainboard/google/eve/spd/Makefile.inc b/src/mainboard/google/eve/spd/Makefile.inc
index de94ad1a9f..d681652445 100644
--- a/src/mainboard/google/eve/spd/Makefile.inc
+++ b/src/mainboard/google/eve/spd/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += spd.c
 
diff --git a/src/mainboard/google/fizz/Makefile.inc b/src/mainboard/google/fizz/Makefile.inc
index 05557a602c..97b4109539 100644
--- a/src/mainboard/google/fizz/Makefile.inc
+++ b/src/mainboard/google/fizz/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += bootblock.c
 bootblock-$(CONFIG_CHROMEOS) += chromeos.c
diff --git a/src/mainboard/google/foster/Kconfig b/src/mainboard/google/foster/Kconfig
index efa9a4b82e..ebd38996fe 100644
--- a/src/mainboard/google/foster/Kconfig
+++ b/src/mainboard/google/foster/Kconfig
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 if BOARD_GOOGLE_FOSTER
 
diff --git a/src/mainboard/google/foster/Makefile.inc b/src/mainboard/google/foster/Makefile.inc
index 342cd17556..a7eebc92a6 100644
--- a/src/mainboard/google/foster/Makefile.inc
+++ b/src/mainboard/google/foster/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 # Add a handler for BCT config files
 $(call add-special-class,bct-cfg)
diff --git a/src/mainboard/google/foster/bct/Makefile.inc b/src/mainboard/google/foster/bct/Makefile.inc
index 463eece617..176999d52b 100644
--- a/src/mainboard/google/foster/bct/Makefile.inc
+++ b/src/mainboard/google/foster/bct/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bct-cfg-$(CONFIG_FOSTER_BCT_CFG_EMMC) += emmc.cfg
 bct-cfg-$(CONFIG_FOSTER_BCT_CFG_SPI) += spi.cfg
diff --git a/src/mainboard/google/foster/bct/cfg2inc.sh b/src/mainboard/google/foster/bct/cfg2inc.sh
index d7b6c46495..30e24c0060 100644
--- a/src/mainboard/google/foster/bct/cfg2inc.sh
+++ b/src/mainboard/google/foster/bct/cfg2inc.sh
@@ -3,14 +3,7 @@
 # This file is part of the coreboot project.
 #
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
+# SPDX-License-Identifier: GPL-2.0-only
 
 bct_cfg2inc() {
 	local in_file="$1"
diff --git a/src/mainboard/google/foster/devicetree.cb b/src/mainboard/google/foster/devicetree.cb
index 33088dcba2..6dcef65588 100644
--- a/src/mainboard/google/foster/devicetree.cb
+++ b/src/mainboard/google/foster/devicetree.cb
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 chip soc/nvidia/tegra210
 	device cpu_cluster 0 on
diff --git a/src/mainboard/google/gale/Kconfig b/src/mainboard/google/gale/Kconfig
index 4f0d1ff125..e0100ca4fd 100644
--- a/src/mainboard/google/gale/Kconfig
+++ b/src/mainboard/google/gale/Kconfig
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 if BOARD_GOOGLE_GALE
 
diff --git a/src/mainboard/google/gale/Makefile.inc b/src/mainboard/google/gale/Makefile.inc
index fea77d2064..5e6f33cafc 100644
--- a/src/mainboard/google/gale/Makefile.inc
+++ b/src/mainboard/google/gale/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += bootblock.c
 bootblock-y += cdp.c
diff --git a/src/mainboard/google/gale/devicetree.cb b/src/mainboard/google/gale/devicetree.cb
index 92fdb4d11d..b20d8dc20d 100644
--- a/src/mainboard/google/gale/devicetree.cb
+++ b/src/mainboard/google/gale/devicetree.cb
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 chip soc/qualcomm/ipq40xx
 	device cpu_cluster 0 on end
diff --git a/src/mainboard/google/glados/Makefile.inc b/src/mainboard/google/glados/Makefile.inc
index 371efaff95..054217eaf9 100644
--- a/src/mainboard/google/glados/Makefile.inc
+++ b/src/mainboard/google/glados/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 subdirs-y += spd
 
diff --git a/src/mainboard/google/glados/cmos.layout b/src/mainboard/google/glados/cmos.layout
index a0edabdccb..1e3aa17b82 100644
--- a/src/mainboard/google/glados/cmos.layout
+++ b/src/mainboard/google/glados/cmos.layout
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 # -----------------------------------------------------------------
 entries
diff --git a/src/mainboard/google/glados/variants/asuka/Makefile.inc b/src/mainboard/google/glados/variants/asuka/Makefile.inc
index a88ed7df53..3f15bda8b8 100644
--- a/src/mainboard/google/glados/variants/asuka/Makefile.inc
+++ b/src/mainboard/google/glados/variants/asuka/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += variant.c
 ramstage-y += variant.c
diff --git a/src/mainboard/google/glados/variants/caroline/Makefile.inc b/src/mainboard/google/glados/variants/caroline/Makefile.inc
index eaa316e410..fa2aa30ba2 100644
--- a/src/mainboard/google/glados/variants/caroline/Makefile.inc
+++ b/src/mainboard/google/glados/variants/caroline/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += variant.c
 ramstage-y += variant.c
diff --git a/src/mainboard/google/glados/variants/cave/Makefile.inc b/src/mainboard/google/glados/variants/cave/Makefile.inc
index 65ae1b7d7f..87a85cd10b 100644
--- a/src/mainboard/google/glados/variants/cave/Makefile.inc
+++ b/src/mainboard/google/glados/variants/cave/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += variant.c
 ramstage-y += variant.c
diff --git a/src/mainboard/google/glados/variants/chell/Makefile.inc b/src/mainboard/google/glados/variants/chell/Makefile.inc
index 1f3fadefb7..71623bcc56 100644
--- a/src/mainboard/google/glados/variants/chell/Makefile.inc
+++ b/src/mainboard/google/glados/variants/chell/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += variant.c
 ramstage-y += variant.c
diff --git a/src/mainboard/google/glados/variants/glados/Makefile.inc b/src/mainboard/google/glados/variants/glados/Makefile.inc
index 8d7111d77e..5f84742acf 100644
--- a/src/mainboard/google/glados/variants/glados/Makefile.inc
+++ b/src/mainboard/google/glados/variants/glados/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += variant.c
 ramstage-y += variant.c
diff --git a/src/mainboard/google/glados/variants/lars/Makefile.inc b/src/mainboard/google/glados/variants/lars/Makefile.inc
index 2772dd0c75..421d0685e7 100644
--- a/src/mainboard/google/glados/variants/lars/Makefile.inc
+++ b/src/mainboard/google/glados/variants/lars/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += variant.c
 ramstage-y += variant.c
diff --git a/src/mainboard/google/glados/variants/sentry/Makefile.inc b/src/mainboard/google/glados/variants/sentry/Makefile.inc
index 778143f9ec..4bfdd9ab60 100644
--- a/src/mainboard/google/glados/variants/sentry/Makefile.inc
+++ b/src/mainboard/google/glados/variants/sentry/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += variant.c
 ramstage-y += variant.c
diff --git a/src/mainboard/google/gru/Kconfig b/src/mainboard/google/gru/Kconfig
index 819c448f15..98eaa02dee 100644
--- a/src/mainboard/google/gru/Kconfig
+++ b/src/mainboard/google/gru/Kconfig
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 config BOARD_GOOGLE_GRU_COMMON  # Umbrella option to be selected by variant boards.
 	def_bool n
diff --git a/src/mainboard/google/gru/Makefile.inc b/src/mainboard/google/gru/Makefile.inc
index 2526445d9b..173459784a 100644
--- a/src/mainboard/google/gru/Makefile.inc
+++ b/src/mainboard/google/gru/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 subdirs-y += sdram_params/
 
diff --git a/src/mainboard/google/gru/devicetree.cb b/src/mainboard/google/gru/devicetree.cb
index 8da218e70f..7142ebd820 100644
--- a/src/mainboard/google/gru/devicetree.cb
+++ b/src/mainboard/google/gru/devicetree.cb
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 chip soc/rockchip/rk3399
 	device cpu_cluster 0 on end
diff --git a/src/mainboard/google/gru/devicetree.scarlet.cb b/src/mainboard/google/gru/devicetree.scarlet.cb
index 601af69161..3910a08842 100644
--- a/src/mainboard/google/gru/devicetree.scarlet.cb
+++ b/src/mainboard/google/gru/devicetree.scarlet.cb
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 chip soc/rockchip/rk3399
 	device cpu_cluster 0 on end
diff --git a/src/mainboard/google/gru/sdram_params/Makefile.inc b/src/mainboard/google/gru/sdram_params/Makefile.inc
index f01f354a26..43fa7dd705 100644
--- a/src/mainboard/google/gru/sdram_params/Makefile.inc
+++ b/src/mainboard/google/gru/sdram_params/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 sdram-params :=
 sdram-params += sdram-lpddr3-generic-4GB-928
diff --git a/src/mainboard/google/hatch/Makefile.inc b/src/mainboard/google/hatch/Makefile.inc
index b430fa7c80..36ddea3e54 100644
--- a/src/mainboard/google/hatch/Makefile.inc
+++ b/src/mainboard/google/hatch/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += bootblock.c
 bootblock-$(CONFIG_CHROMEOS) += chromeos.c
diff --git a/src/mainboard/google/hatch/spd/Makefile.inc b/src/mainboard/google/hatch/spd/Makefile.inc
index b67438b1e6..4d7bd8ed2e 100644
--- a/src/mainboard/google/hatch/spd/Makefile.inc
+++ b/src/mainboard/google/hatch/spd/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 ifneq ($(SPD_SOURCES),)
 SPD_BIN = $(obj)/spd.bin
diff --git a/src/mainboard/google/hatch/variants/akemi/Makefile.inc b/src/mainboard/google/hatch/variants/akemi/Makefile.inc
index 103d9e1990..9677982a67 100644
--- a/src/mainboard/google/hatch/variants/akemi/Makefile.inc
+++ b/src/mainboard/google/hatch/variants/akemi/Makefile.inc
@@ -1,15 +1,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_SOURCES = 4G_2400		# 0b000
 SPD_SOURCES += empty_ddr4	# 0b001
diff --git a/src/mainboard/google/hatch/variants/baseboard/Makefile.inc b/src/mainboard/google/hatch/variants/baseboard/Makefile.inc
index 13c45cbf45..0a81fecb20 100644
--- a/src/mainboard/google/hatch/variants/baseboard/Makefile.inc
+++ b/src/mainboard/google/hatch/variants/baseboard/Makefile.inc
@@ -1,15 +1,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += gpio.c
 
diff --git a/src/mainboard/google/hatch/variants/dratini/Makefile.inc b/src/mainboard/google/hatch/variants/dratini/Makefile.inc
index ada9a960c9..8b9fa28091 100644
--- a/src/mainboard/google/hatch/variants/dratini/Makefile.inc
+++ b/src/mainboard/google/hatch/variants/dratini/Makefile.inc
@@ -1,15 +1,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_SOURCES = 4G_2400         # 0b0000
 SPD_SOURCES += empty_ddr4     # 0b0001
diff --git a/src/mainboard/google/hatch/variants/duffy/Makefile.inc b/src/mainboard/google/hatch/variants/duffy/Makefile.inc
index 8cbad31648..c17467caa3 100644
--- a/src/mainboard/google/hatch/variants/duffy/Makefile.inc
+++ b/src/mainboard/google/hatch/variants/duffy/Makefile.inc
@@ -1,15 +1,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 ramstage-y += gpio.c
 ramstage-y += mainboard.c
diff --git a/src/mainboard/google/hatch/variants/hatch/Makefile.inc b/src/mainboard/google/hatch/variants/hatch/Makefile.inc
index 77cb535095..61d3614e6b 100644
--- a/src/mainboard/google/hatch/variants/hatch/Makefile.inc
+++ b/src/mainboard/google/hatch/variants/hatch/Makefile.inc
@@ -1,15 +1,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_SOURCES = 4G_2400		# 0b000
 SPD_SOURCES += empty_ddr4	# 0b001
diff --git a/src/mainboard/google/hatch/variants/helios/Makefile.inc b/src/mainboard/google/hatch/variants/helios/Makefile.inc
index acf6a751d6..40e7a7ab4c 100644
--- a/src/mainboard/google/hatch/variants/helios/Makefile.inc
+++ b/src/mainboard/google/hatch/variants/helios/Makefile.inc
@@ -1,15 +1,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_SOURCES = LP_8G_2133		# 0b0000
 SPD_SOURCES += LP_16G_2133		# 0b0001
diff --git a/src/mainboard/google/hatch/variants/jinlon/Makefile.inc b/src/mainboard/google/hatch/variants/jinlon/Makefile.inc
index 0803710802..fc606215ad 100644
--- a/src/mainboard/google/hatch/variants/jinlon/Makefile.inc
+++ b/src/mainboard/google/hatch/variants/jinlon/Makefile.inc
@@ -1,15 +1,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_SOURCES = 4G_2400         # 0b000
 SPD_SOURCES += empty_ddr4     # 0b001
diff --git a/src/mainboard/google/hatch/variants/kaisa/Makefile.inc b/src/mainboard/google/hatch/variants/kaisa/Makefile.inc
index 8cbad31648..c17467caa3 100644
--- a/src/mainboard/google/hatch/variants/kaisa/Makefile.inc
+++ b/src/mainboard/google/hatch/variants/kaisa/Makefile.inc
@@ -1,15 +1,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 ramstage-y += gpio.c
 ramstage-y += mainboard.c
diff --git a/src/mainboard/google/hatch/variants/kindred/Makefile.inc b/src/mainboard/google/hatch/variants/kindred/Makefile.inc
index 6f8d94be3f..1dea9defc0 100644
--- a/src/mainboard/google/hatch/variants/kindred/Makefile.inc
+++ b/src/mainboard/google/hatch/variants/kindred/Makefile.inc
@@ -1,15 +1,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_SOURCES = 4G_2400   # 0b000
 SPD_SOURCES += empty_ddr4 # 0b001
diff --git a/src/mainboard/google/hatch/variants/kohaku/Makefile.inc b/src/mainboard/google/hatch/variants/kohaku/Makefile.inc
index ea2a901f68..0f8b72b88e 100644
--- a/src/mainboard/google/hatch/variants/kohaku/Makefile.inc
+++ b/src/mainboard/google/hatch/variants/kohaku/Makefile.inc
@@ -1,15 +1,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_SOURCES = LP_8G_2133		# 0b000
 SPD_SOURCES += LP_16G_2133		# 0b001
diff --git a/src/mainboard/google/hatch/variants/mushu/Makefile.inc b/src/mainboard/google/hatch/variants/mushu/Makefile.inc
index 77cb535095..61d3614e6b 100644
--- a/src/mainboard/google/hatch/variants/mushu/Makefile.inc
+++ b/src/mainboard/google/hatch/variants/mushu/Makefile.inc
@@ -1,15 +1,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_SOURCES = 4G_2400		# 0b000
 SPD_SOURCES += empty_ddr4	# 0b001
diff --git a/src/mainboard/google/hatch/variants/nightfury/Makefile.inc b/src/mainboard/google/hatch/variants/nightfury/Makefile.inc
index f44654a8f6..f8ee7bc306 100644
--- a/src/mainboard/google/hatch/variants/nightfury/Makefile.inc
+++ b/src/mainboard/google/hatch/variants/nightfury/Makefile.inc
@@ -1,15 +1,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_SOURCES = LP_8G_2133	# 0b000
 SPD_SOURCES += empty_ddr4	# 0b001
diff --git a/src/mainboard/google/hatch/variants/puff/Makefile.inc b/src/mainboard/google/hatch/variants/puff/Makefile.inc
index 8cbad31648..c17467caa3 100644
--- a/src/mainboard/google/hatch/variants/puff/Makefile.inc
+++ b/src/mainboard/google/hatch/variants/puff/Makefile.inc
@@ -1,15 +1,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 ramstage-y += gpio.c
 ramstage-y += mainboard.c
diff --git a/src/mainboard/google/hatch/variants/stryke/Makefile.inc b/src/mainboard/google/hatch/variants/stryke/Makefile.inc
index ab779a9bce..53885127f2 100644
--- a/src/mainboard/google/hatch/variants/stryke/Makefile.inc
+++ b/src/mainboard/google/hatch/variants/stryke/Makefile.inc
@@ -1,14 +1,6 @@
 ## This file is part of the coreboot project.
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_SOURCES = 4G_2400         # 0b000
 SPD_SOURCES += empty_ddr4     # 0b001
diff --git a/src/mainboard/google/hatch/variants/sushi/Makefile.inc b/src/mainboard/google/hatch/variants/sushi/Makefile.inc
index 38cf728d8f..c4442094e4 100644
--- a/src/mainboard/google/hatch/variants/sushi/Makefile.inc
+++ b/src/mainboard/google/hatch/variants/sushi/Makefile.inc
@@ -1,13 +1,5 @@
 ## This file is part of the coreboot project.
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_SOURCES =
diff --git a/src/mainboard/google/jecht/Makefile.inc b/src/mainboard/google/jecht/Makefile.inc
index 777974cee6..32ac1c8852 100644
--- a/src/mainboard/google/jecht/Makefile.inc
+++ b/src/mainboard/google/jecht/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 subdirs-y += spd
 romstage-$(CONFIG_CHROMEOS) += chromeos.c
diff --git a/src/mainboard/google/jecht/cmos.layout b/src/mainboard/google/jecht/cmos.layout
index a0edabdccb..1e3aa17b82 100644
--- a/src/mainboard/google/jecht/cmos.layout
+++ b/src/mainboard/google/jecht/cmos.layout
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 # -----------------------------------------------------------------
 entries
diff --git a/src/mainboard/google/jecht/spd/Makefile.inc b/src/mainboard/google/jecht/spd/Makefile.inc
index cc9726f5fb..e3b4cfdfc2 100644
--- a/src/mainboard/google/jecht/spd/Makefile.inc
+++ b/src/mainboard/google/jecht/spd/Makefile.inc
@@ -2,14 +2,6 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-y += spd.c
diff --git a/src/mainboard/google/kahlee/Kconfig b/src/mainboard/google/kahlee/Kconfig
index 85384dc019..29cc3c72c2 100644
--- a/src/mainboard/google/kahlee/Kconfig
+++ b/src/mainboard/google/kahlee/Kconfig
@@ -2,15 +2,7 @@
 # This file is part of the coreboot project.
 #
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
+# SPDX-License-Identifier: GPL-2.0-only
 
 config BOARD_GOOGLE_BASEBOARD_KAHLEE
 	bool
diff --git a/src/mainboard/google/kahlee/Makefile.inc b/src/mainboard/google/kahlee/Makefile.inc
index 097566c1e5..2a770b6195 100644
--- a/src/mainboard/google/kahlee/Makefile.inc
+++ b/src/mainboard/google/kahlee/Makefile.inc
@@ -2,15 +2,7 @@
 # This file is part of the coreboot project.
 #
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
+# SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += bootblock/bootblock.c
 bootblock-y += BiosCallOuts.c
diff --git a/src/mainboard/google/kahlee/variants/aleena/Makefile.inc b/src/mainboard/google/kahlee/variants/aleena/Makefile.inc
index ba3228d6c3..c93956bab3 100644
--- a/src/mainboard/google/kahlee/variants/aleena/Makefile.inc
+++ b/src/mainboard/google/kahlee/variants/aleena/Makefile.inc
@@ -2,15 +2,7 @@
 # This file is part of the coreboot project.
 #
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
+# SPDX-License-Identifier: GPL-2.0-only
 
 subdirs-y += ../baseboard/spd
 
diff --git a/src/mainboard/google/kahlee/variants/aleena/devicetree.cb b/src/mainboard/google/kahlee/variants/aleena/devicetree.cb
index 864e0cd92a..2cac8472d0 100644
--- a/src/mainboard/google/kahlee/variants/aleena/devicetree.cb
+++ b/src/mainboard/google/kahlee/variants/aleena/devicetree.cb
@@ -2,15 +2,8 @@
 # This file is part of the coreboot project.
 #
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/amd/stoneyridge
 	register "spd_addr_lookup" = "
 	{
diff --git a/src/mainboard/google/kahlee/variants/baseboard/Makefile.inc b/src/mainboard/google/kahlee/variants/baseboard/Makefile.inc
index efcf35de0f..6e46166765 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/Makefile.inc
+++ b/src/mainboard/google/kahlee/variants/baseboard/Makefile.inc
@@ -2,15 +2,7 @@
 # This file is part of the coreboot project.
 #
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
+# SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += gpio.c
 bootblock-y += OemCustomize.c
diff --git a/src/mainboard/google/kahlee/variants/baseboard/spd/Makefile.inc b/src/mainboard/google/kahlee/variants/baseboard/spd/Makefile.inc
index bc3f6b6879..82930beaf3 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/spd/Makefile.inc
+++ b/src/mainboard/google/kahlee/variants/baseboard/spd/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 LIB_SPD_DEPS = $(foreach f, $(SPD_SOURCES), src/mainboard/$(MAINBOARDDIR)/spd/$(f).spd.hex)
 
diff --git a/src/mainboard/google/kahlee/variants/careena/Makefile.inc b/src/mainboard/google/kahlee/variants/careena/Makefile.inc
index dd9ff4eded..dcd7d302a4 100644
--- a/src/mainboard/google/kahlee/variants/careena/Makefile.inc
+++ b/src/mainboard/google/kahlee/variants/careena/Makefile.inc
@@ -2,15 +2,7 @@
 # This file is part of the coreboot project.
 #
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
+# SPDX-License-Identifier: GPL-2.0-only
 
 subdirs-y += ./spd
 
diff --git a/src/mainboard/google/kahlee/variants/careena/devicetree.cb b/src/mainboard/google/kahlee/variants/careena/devicetree.cb
index 6c28d0ffc0..b2e1d659d0 100644
--- a/src/mainboard/google/kahlee/variants/careena/devicetree.cb
+++ b/src/mainboard/google/kahlee/variants/careena/devicetree.cb
@@ -2,15 +2,8 @@
 # This file is part of the coreboot project.
 #
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/amd/stoneyridge
 	register "spd_addr_lookup" = "
 	{
diff --git a/src/mainboard/google/kahlee/variants/careena/spd/Makefile.inc b/src/mainboard/google/kahlee/variants/careena/spd/Makefile.inc
index 8deec06321..250ffcb4e2 100644
--- a/src/mainboard/google/kahlee/variants/careena/spd/Makefile.inc
+++ b/src/mainboard/google/kahlee/variants/careena/spd/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 LIB_SPD_DEPS = $(foreach f, $(SPD_SOURCES), src/mainboard/$(MAINBOARDDIR)/spd/$(f).spd.hex)
 
diff --git a/src/mainboard/google/kahlee/variants/grunt/Makefile.inc b/src/mainboard/google/kahlee/variants/grunt/Makefile.inc
index ba3228d6c3..c93956bab3 100644
--- a/src/mainboard/google/kahlee/variants/grunt/Makefile.inc
+++ b/src/mainboard/google/kahlee/variants/grunt/Makefile.inc
@@ -2,15 +2,7 @@
 # This file is part of the coreboot project.
 #
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
+# SPDX-License-Identifier: GPL-2.0-only
 
 subdirs-y += ../baseboard/spd
 
diff --git a/src/mainboard/google/kahlee/variants/grunt/devicetree.cb b/src/mainboard/google/kahlee/variants/grunt/devicetree.cb
index efa4066346..3fdd3e0b6b 100644
--- a/src/mainboard/google/kahlee/variants/grunt/devicetree.cb
+++ b/src/mainboard/google/kahlee/variants/grunt/devicetree.cb
@@ -2,15 +2,8 @@
 # This file is part of the coreboot project.
 #
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/amd/stoneyridge
 	register "spd_addr_lookup" = "
 	{
diff --git a/src/mainboard/google/kahlee/variants/liara/Makefile.inc b/src/mainboard/google/kahlee/variants/liara/Makefile.inc
index ba3228d6c3..c93956bab3 100644
--- a/src/mainboard/google/kahlee/variants/liara/Makefile.inc
+++ b/src/mainboard/google/kahlee/variants/liara/Makefile.inc
@@ -2,15 +2,7 @@
 # This file is part of the coreboot project.
 #
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
+# SPDX-License-Identifier: GPL-2.0-only
 
 subdirs-y += ../baseboard/spd
 
diff --git a/src/mainboard/google/kahlee/variants/liara/devicetree.cb b/src/mainboard/google/kahlee/variants/liara/devicetree.cb
index 0983f7955e..133cc977ba 100644
--- a/src/mainboard/google/kahlee/variants/liara/devicetree.cb
+++ b/src/mainboard/google/kahlee/variants/liara/devicetree.cb
@@ -2,15 +2,8 @@
 # This file is part of the coreboot project.
 #
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/amd/stoneyridge
 	register "spd_addr_lookup" = "
 	{
diff --git a/src/mainboard/google/kahlee/variants/nuwani/Makefile.inc b/src/mainboard/google/kahlee/variants/nuwani/Makefile.inc
index 89458dec87..33fb542079 100644
--- a/src/mainboard/google/kahlee/variants/nuwani/Makefile.inc
+++ b/src/mainboard/google/kahlee/variants/nuwani/Makefile.inc
@@ -2,15 +2,7 @@
 # This file is part of the coreboot project.
 #
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
+# SPDX-License-Identifier: GPL-2.0-only
 
 subdirs-y += ./spd
 
diff --git a/src/mainboard/google/kahlee/variants/nuwani/devicetree.cb b/src/mainboard/google/kahlee/variants/nuwani/devicetree.cb
index efe92f723e..cb27f75b58 100644
--- a/src/mainboard/google/kahlee/variants/nuwani/devicetree.cb
+++ b/src/mainboard/google/kahlee/variants/nuwani/devicetree.cb
@@ -2,15 +2,8 @@
 # This file is part of the coreboot project.
 #
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/amd/stoneyridge
 	register "spd_addr_lookup" = "
 	{
diff --git a/src/mainboard/google/kahlee/variants/nuwani/spd/Makefile.inc b/src/mainboard/google/kahlee/variants/nuwani/spd/Makefile.inc
index 307b499b50..45487cbac1 100644
--- a/src/mainboard/google/kahlee/variants/nuwani/spd/Makefile.inc
+++ b/src/mainboard/google/kahlee/variants/nuwani/spd/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 LIB_SPD_DEPS = $(foreach f, $(SPD_SOURCES), src/mainboard/$(MAINBOARDDIR)/spd/$(f).spd.hex)
 
diff --git a/src/mainboard/google/kahlee/variants/treeya/Makefile.inc b/src/mainboard/google/kahlee/variants/treeya/Makefile.inc
index 89458dec87..33fb542079 100644
--- a/src/mainboard/google/kahlee/variants/treeya/Makefile.inc
+++ b/src/mainboard/google/kahlee/variants/treeya/Makefile.inc
@@ -2,15 +2,7 @@
 # This file is part of the coreboot project.
 #
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
+# SPDX-License-Identifier: GPL-2.0-only
 
 subdirs-y += ./spd
 
diff --git a/src/mainboard/google/kahlee/variants/treeya/devicetree.cb b/src/mainboard/google/kahlee/variants/treeya/devicetree.cb
index efc384fea9..a4d44c54b8 100644
--- a/src/mainboard/google/kahlee/variants/treeya/devicetree.cb
+++ b/src/mainboard/google/kahlee/variants/treeya/devicetree.cb
@@ -2,15 +2,8 @@
 # This file is part of the coreboot project.
 #
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/amd/stoneyridge
 	register "spd_addr_lookup" = "
 	{
diff --git a/src/mainboard/google/kahlee/variants/treeya/spd/Makefile.inc b/src/mainboard/google/kahlee/variants/treeya/spd/Makefile.inc
index 307b499b50..45487cbac1 100644
--- a/src/mainboard/google/kahlee/variants/treeya/spd/Makefile.inc
+++ b/src/mainboard/google/kahlee/variants/treeya/spd/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 LIB_SPD_DEPS = $(foreach f, $(SPD_SOURCES), src/mainboard/$(MAINBOARDDIR)/spd/$(f).spd.hex)
 
diff --git a/src/mainboard/google/kukui/Kconfig b/src/mainboard/google/kukui/Kconfig
index 69c0374e14..44af8bd8ba 100644
--- a/src/mainboard/google/kukui/Kconfig
+++ b/src/mainboard/google/kukui/Kconfig
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 # Umbrella option to be selected by variant boards.
 config BOARD_GOOGLE_KUKUI_COMMON
diff --git a/src/mainboard/google/kukui/devicetree.cb b/src/mainboard/google/kukui/devicetree.cb
index f11ca45a0e..96be830116 100644
--- a/src/mainboard/google/kukui/devicetree.cb
+++ b/src/mainboard/google/kukui/devicetree.cb
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 chip soc/mediatek/mt8183
 	device cpu_cluster 0 on
diff --git a/src/mainboard/google/link/Makefile.inc b/src/mainboard/google/link/Makefile.inc
index 0e720e90ab..196e362fa3 100644
--- a/src/mainboard/google/link/Makefile.inc
+++ b/src/mainboard/google/link/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 ramstage-y += ec.c
 
diff --git a/src/mainboard/google/link/cmos.layout b/src/mainboard/google/link/cmos.layout
index 615ff29dce..1131406a90 100644
--- a/src/mainboard/google/link/cmos.layout
+++ b/src/mainboard/google/link/cmos.layout
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 # -----------------------------------------------------------------
 entries
diff --git a/src/mainboard/google/nyan/Kconfig b/src/mainboard/google/nyan/Kconfig
index 82577e9eea..e9d4bbfca6 100644
--- a/src/mainboard/google/nyan/Kconfig
+++ b/src/mainboard/google/nyan/Kconfig
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 if BOARD_GOOGLE_NYAN
 
diff --git a/src/mainboard/google/nyan/Makefile.inc b/src/mainboard/google/nyan/Makefile.inc
index 463747d9c4..5f5da2438b 100644
--- a/src/mainboard/google/nyan/Makefile.inc
+++ b/src/mainboard/google/nyan/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 # Add a handler for BCT config files
 $(call add-special-class,bct-cfg)
diff --git a/src/mainboard/google/nyan/bct/Makefile.inc b/src/mainboard/google/nyan/bct/Makefile.inc
index 311f34c7ef..8c9cf73858 100644
--- a/src/mainboard/google/nyan/bct/Makefile.inc
+++ b/src/mainboard/google/nyan/bct/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bct-cfg-$(CONFIG_NYAN_BCT_CFG_EMMC) += emmc.cfg
 bct-cfg-$(CONFIG_NYAN_BCT_CFG_SPI) += spi.cfg
diff --git a/src/mainboard/google/nyan/bct/cfg2inc.sh b/src/mainboard/google/nyan/bct/cfg2inc.sh
index d7b6c46495..30e24c0060 100755
--- a/src/mainboard/google/nyan/bct/cfg2inc.sh
+++ b/src/mainboard/google/nyan/bct/cfg2inc.sh
@@ -3,14 +3,7 @@
 # This file is part of the coreboot project.
 #
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
+# SPDX-License-Identifier: GPL-2.0-only
 
 bct_cfg2inc() {
 	local in_file="$1"
diff --git a/src/mainboard/google/nyan/devicetree.cb b/src/mainboard/google/nyan/devicetree.cb
index 015a84c779..4a1b02324a 100644
--- a/src/mainboard/google/nyan/devicetree.cb
+++ b/src/mainboard/google/nyan/devicetree.cb
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 chip soc/nvidia/tegra124
 	device cpu_cluster 0 on end
diff --git a/src/mainboard/google/nyan_big/Kconfig b/src/mainboard/google/nyan_big/Kconfig
index 099ff7f92d..0bb96e7588 100644
--- a/src/mainboard/google/nyan_big/Kconfig
+++ b/src/mainboard/google/nyan_big/Kconfig
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 if BOARD_GOOGLE_NYAN_BIG
 
diff --git a/src/mainboard/google/nyan_big/Makefile.inc b/src/mainboard/google/nyan_big/Makefile.inc
index d6729a108b..4bf9e9c21f 100644
--- a/src/mainboard/google/nyan_big/Makefile.inc
+++ b/src/mainboard/google/nyan_big/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 # Add a handler for BCT config files
 $(call add-special-class,bct-cfg)
diff --git a/src/mainboard/google/nyan_big/bct/Makefile.inc b/src/mainboard/google/nyan_big/bct/Makefile.inc
index b918e15fc5..fe29446d49 100644
--- a/src/mainboard/google/nyan_big/bct/Makefile.inc
+++ b/src/mainboard/google/nyan_big/bct/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bct-cfg-$(CONFIG_NYAN_BIG_BCT_CFG_EMMC) += emmc.cfg
 bct-cfg-$(CONFIG_NYAN_BIG_BCT_CFG_SPI) += spi.cfg
diff --git a/src/mainboard/google/nyan_big/devicetree.cb b/src/mainboard/google/nyan_big/devicetree.cb
index 015a84c779..4a1b02324a 100644
--- a/src/mainboard/google/nyan_big/devicetree.cb
+++ b/src/mainboard/google/nyan_big/devicetree.cb
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 chip soc/nvidia/tegra124
 	device cpu_cluster 0 on end
diff --git a/src/mainboard/google/nyan_blaze/Kconfig b/src/mainboard/google/nyan_blaze/Kconfig
index 4c611b986e..6f77f4bc3e 100644
--- a/src/mainboard/google/nyan_blaze/Kconfig
+++ b/src/mainboard/google/nyan_blaze/Kconfig
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 if BOARD_GOOGLE_NYAN_BLAZE
 
diff --git a/src/mainboard/google/nyan_blaze/Makefile.inc b/src/mainboard/google/nyan_blaze/Makefile.inc
index c5d6a10a6f..fe1859e3ba 100644
--- a/src/mainboard/google/nyan_blaze/Makefile.inc
+++ b/src/mainboard/google/nyan_blaze/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 # Add a handler for BCT config files
 $(call add-special-class,bct-cfg)
diff --git a/src/mainboard/google/nyan_blaze/bct/Makefile.inc b/src/mainboard/google/nyan_blaze/bct/Makefile.inc
index d098a6ed75..00b66d73bb 100644
--- a/src/mainboard/google/nyan_blaze/bct/Makefile.inc
+++ b/src/mainboard/google/nyan_blaze/bct/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bct-cfg-$(CONFIG_NYAN_BLAZE_BCT_CFG_EMMC) += emmc.cfg
 bct-cfg-$(CONFIG_NYAN_BLAZE_BCT_CFG_SPI) += spi.cfg
diff --git a/src/mainboard/google/nyan_blaze/devicetree.cb b/src/mainboard/google/nyan_blaze/devicetree.cb
index 015a84c779..4a1b02324a 100644
--- a/src/mainboard/google/nyan_blaze/devicetree.cb
+++ b/src/mainboard/google/nyan_blaze/devicetree.cb
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 chip soc/nvidia/tegra124
 	device cpu_cluster 0 on end
diff --git a/src/mainboard/google/oak/Kconfig b/src/mainboard/google/oak/Kconfig
index d1c5a9e211..62e089d283 100644
--- a/src/mainboard/google/oak/Kconfig
+++ b/src/mainboard/google/oak/Kconfig
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 config BOARD_GOOGLE_OAK_COMMON
 	def_bool n
diff --git a/src/mainboard/google/oak/Makefile.inc b/src/mainboard/google/oak/Makefile.inc
index b6998528a7..dc99fdd430 100644
--- a/src/mainboard/google/oak/Makefile.inc
+++ b/src/mainboard/google/oak/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += bootblock.c
 bootblock-y += memlayout.ld
diff --git a/src/mainboard/google/oak/devicetree.cb b/src/mainboard/google/oak/devicetree.cb
index be8698996f..9922e5e067 100644
--- a/src/mainboard/google/oak/devicetree.cb
+++ b/src/mainboard/google/oak/devicetree.cb
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 chip soc/mediatek/mt8173
 	device cpu_cluster 0 on
diff --git a/src/mainboard/google/parrot/Makefile.inc b/src/mainboard/google/parrot/Makefile.inc
index 15adb811fa..61fb2d2d42 100644
--- a/src/mainboard/google/parrot/Makefile.inc
+++ b/src/mainboard/google/parrot/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 ramstage-y += ec.c
 
diff --git a/src/mainboard/google/parrot/cmos.layout b/src/mainboard/google/parrot/cmos.layout
index 615ff29dce..1131406a90 100644
--- a/src/mainboard/google/parrot/cmos.layout
+++ b/src/mainboard/google/parrot/cmos.layout
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 # -----------------------------------------------------------------
 entries
diff --git a/src/mainboard/google/peach_pit/Kconfig b/src/mainboard/google/peach_pit/Kconfig
index 13c44f29a8..91d69e82d0 100644
--- a/src/mainboard/google/peach_pit/Kconfig
+++ b/src/mainboard/google/peach_pit/Kconfig
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 if BOARD_GOOGLE_PEACH_PIT
 
diff --git a/src/mainboard/google/peach_pit/Makefile.inc b/src/mainboard/google/peach_pit/Makefile.inc
index fd76686e40..32046b1d4a 100644
--- a/src/mainboard/google/peach_pit/Makefile.inc
+++ b/src/mainboard/google/peach_pit/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += wakeup.c
 
diff --git a/src/mainboard/google/peach_pit/devicetree.cb b/src/mainboard/google/peach_pit/devicetree.cb
index a86fb22695..995c7c876b 100644
--- a/src/mainboard/google/peach_pit/devicetree.cb
+++ b/src/mainboard/google/peach_pit/devicetree.cb
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 chip soc/samsung/exynos5420
 	device cpu_cluster 0 on end
diff --git a/src/mainboard/google/poppy/Makefile.inc b/src/mainboard/google/poppy/Makefile.inc
index 69cfe29400..ab584d4773 100644
--- a/src/mainboard/google/poppy/Makefile.inc
+++ b/src/mainboard/google/poppy/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += bootblock.c
 bootblock-$(CONFIG_CHROMEOS) += chromeos.c
diff --git a/src/mainboard/google/rambi/Makefile.inc b/src/mainboard/google/rambi/Makefile.inc
index f9b0d7992d..d309647092 100644
--- a/src/mainboard/google/rambi/Makefile.inc
+++ b/src/mainboard/google/rambi/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 romstage-$(CONFIG_CHROMEOS) += chromeos.c
 ramstage-$(CONFIG_CHROMEOS) += chromeos.c
diff --git a/src/mainboard/google/rambi/cmos.layout b/src/mainboard/google/rambi/cmos.layout
index 014f442651..6e04c5b225 100644
--- a/src/mainboard/google/rambi/cmos.layout
+++ b/src/mainboard/google/rambi/cmos.layout
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 # -----------------------------------------------------------------
 entries
diff --git a/src/mainboard/google/rambi/variants/banjo/Makefile.inc b/src/mainboard/google/rambi/variants/banjo/Makefile.inc
index 379f85cd3f..44a01e9cdd 100644
--- a/src/mainboard/google/rambi/variants/banjo/Makefile.inc
+++ b/src/mainboard/google/rambi/variants/banjo/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_BIN = $(obj)/spd.bin
 
diff --git a/src/mainboard/google/rambi/variants/candy/Makefile.inc b/src/mainboard/google/rambi/variants/candy/Makefile.inc
index d69b72c2a6..105d83bbe0 100644
--- a/src/mainboard/google/rambi/variants/candy/Makefile.inc
+++ b/src/mainboard/google/rambi/variants/candy/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_BIN = $(obj)/spd.bin
 
diff --git a/src/mainboard/google/rambi/variants/clapper/Makefile.inc b/src/mainboard/google/rambi/variants/clapper/Makefile.inc
index 1d09e1ef3b..9bed767189 100644
--- a/src/mainboard/google/rambi/variants/clapper/Makefile.inc
+++ b/src/mainboard/google/rambi/variants/clapper/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_BIN = $(obj)/spd.bin
 
diff --git a/src/mainboard/google/rambi/variants/enguarde/Makefile.inc b/src/mainboard/google/rambi/variants/enguarde/Makefile.inc
index 98a7e3d087..9beb8ffaa2 100644
--- a/src/mainboard/google/rambi/variants/enguarde/Makefile.inc
+++ b/src/mainboard/google/rambi/variants/enguarde/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_BIN = $(obj)/spd.bin
 
diff --git a/src/mainboard/google/rambi/variants/glimmer/Makefile.inc b/src/mainboard/google/rambi/variants/glimmer/Makefile.inc
index 5fcea881bc..4a4810f5f7 100644
--- a/src/mainboard/google/rambi/variants/glimmer/Makefile.inc
+++ b/src/mainboard/google/rambi/variants/glimmer/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_BIN = $(obj)/spd.bin
 
diff --git a/src/mainboard/google/rambi/variants/gnawty/Makefile.inc b/src/mainboard/google/rambi/variants/gnawty/Makefile.inc
index d21bd46b06..cb0918918c 100644
--- a/src/mainboard/google/rambi/variants/gnawty/Makefile.inc
+++ b/src/mainboard/google/rambi/variants/gnawty/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_BIN = $(obj)/spd.bin
 
diff --git a/src/mainboard/google/rambi/variants/heli/Makefile.inc b/src/mainboard/google/rambi/variants/heli/Makefile.inc
index e2f7af17fd..1447cf91c4 100644
--- a/src/mainboard/google/rambi/variants/heli/Makefile.inc
+++ b/src/mainboard/google/rambi/variants/heli/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_BIN = $(obj)/spd.bin
 
diff --git a/src/mainboard/google/rambi/variants/kip/Makefile.inc b/src/mainboard/google/rambi/variants/kip/Makefile.inc
index 017e8e2495..23aa87c0e2 100644
--- a/src/mainboard/google/rambi/variants/kip/Makefile.inc
+++ b/src/mainboard/google/rambi/variants/kip/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_BIN = $(obj)/spd.bin
 
diff --git a/src/mainboard/google/rambi/variants/ninja/Makefile.inc b/src/mainboard/google/rambi/variants/ninja/Makefile.inc
index 6c094eef0d..32fe206d99 100644
--- a/src/mainboard/google/rambi/variants/ninja/Makefile.inc
+++ b/src/mainboard/google/rambi/variants/ninja/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_BIN = $(obj)/spd.bin
 
diff --git a/src/mainboard/google/rambi/variants/orco/Makefile.inc b/src/mainboard/google/rambi/variants/orco/Makefile.inc
index a5c8f31523..01d44b96bc 100644
--- a/src/mainboard/google/rambi/variants/orco/Makefile.inc
+++ b/src/mainboard/google/rambi/variants/orco/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_BIN = $(obj)/spd.bin
 
diff --git a/src/mainboard/google/rambi/variants/quawks/Makefile.inc b/src/mainboard/google/rambi/variants/quawks/Makefile.inc
index 19b5093cbc..72283b078a 100644
--- a/src/mainboard/google/rambi/variants/quawks/Makefile.inc
+++ b/src/mainboard/google/rambi/variants/quawks/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_BIN = $(obj)/spd.bin
 
diff --git a/src/mainboard/google/rambi/variants/rambi/Makefile.inc b/src/mainboard/google/rambi/variants/rambi/Makefile.inc
index df68deb472..ee769d1a17 100644
--- a/src/mainboard/google/rambi/variants/rambi/Makefile.inc
+++ b/src/mainboard/google/rambi/variants/rambi/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_BIN = $(obj)/spd.bin
 
diff --git a/src/mainboard/google/rambi/variants/squawks/Makefile.inc b/src/mainboard/google/rambi/variants/squawks/Makefile.inc
index 19b5093cbc..72283b078a 100644
--- a/src/mainboard/google/rambi/variants/squawks/Makefile.inc
+++ b/src/mainboard/google/rambi/variants/squawks/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_BIN = $(obj)/spd.bin
 
diff --git a/src/mainboard/google/rambi/variants/sumo/Makefile.inc b/src/mainboard/google/rambi/variants/sumo/Makefile.inc
index 6c094eef0d..32fe206d99 100644
--- a/src/mainboard/google/rambi/variants/sumo/Makefile.inc
+++ b/src/mainboard/google/rambi/variants/sumo/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_BIN = $(obj)/spd.bin
 
diff --git a/src/mainboard/google/rambi/variants/swanky/Makefile.inc b/src/mainboard/google/rambi/variants/swanky/Makefile.inc
index d7bee39c03..984a4ba011 100644
--- a/src/mainboard/google/rambi/variants/swanky/Makefile.inc
+++ b/src/mainboard/google/rambi/variants/swanky/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_BIN = $(obj)/spd.bin
 
diff --git a/src/mainboard/google/rambi/variants/winky/Makefile.inc b/src/mainboard/google/rambi/variants/winky/Makefile.inc
index dc861bf8f5..a08e72253d 100644
--- a/src/mainboard/google/rambi/variants/winky/Makefile.inc
+++ b/src/mainboard/google/rambi/variants/winky/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_BIN = $(obj)/spd.bin
 
diff --git a/src/mainboard/google/sarien/Makefile.inc b/src/mainboard/google/sarien/Makefile.inc
index 0595623b37..3cea012364 100644
--- a/src/mainboard/google/sarien/Makefile.inc
+++ b/src/mainboard/google/sarien/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += bootblock.c
 
diff --git a/src/mainboard/google/sarien/variants/arcada/Makefile.inc b/src/mainboard/google/sarien/variants/arcada/Makefile.inc
index c8d31fdea6..78b64f8eb2 100644
--- a/src/mainboard/google/sarien/variants/arcada/Makefile.inc
+++ b/src/mainboard/google/sarien/variants/arcada/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += gpio.c
 ramstage-y += gpio.c
diff --git a/src/mainboard/google/sarien/variants/sarien/Makefile.inc b/src/mainboard/google/sarien/variants/sarien/Makefile.inc
index c8d31fdea6..78b64f8eb2 100644
--- a/src/mainboard/google/sarien/variants/sarien/Makefile.inc
+++ b/src/mainboard/google/sarien/variants/sarien/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += gpio.c
 ramstage-y += gpio.c
diff --git a/src/mainboard/google/slippy/Makefile.inc b/src/mainboard/google/slippy/Makefile.inc
index eb75196f2d..5040952733 100644
--- a/src/mainboard/google/slippy/Makefile.inc
+++ b/src/mainboard/google/slippy/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 ramstage-$(CONFIG_EC_GOOGLE_CHROMEEC) += ec.c
 
diff --git a/src/mainboard/google/slippy/cmos.layout b/src/mainboard/google/slippy/cmos.layout
index 014f442651..6e04c5b225 100644
--- a/src/mainboard/google/slippy/cmos.layout
+++ b/src/mainboard/google/slippy/cmos.layout
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 # -----------------------------------------------------------------
 entries
diff --git a/src/mainboard/google/slippy/variants/falco/Makefile.inc b/src/mainboard/google/slippy/variants/falco/Makefile.inc
index 650d12e740..9521fe52a3 100644
--- a/src/mainboard/google/slippy/variants/falco/Makefile.inc
+++ b/src/mainboard/google/slippy/variants/falco/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 ## DIMM SPD for on-board memory
 SPD_BIN = $(obj)/spd.bin
diff --git a/src/mainboard/google/slippy/variants/leon/Makefile.inc b/src/mainboard/google/slippy/variants/leon/Makefile.inc
index 2ba682e2ec..22dc4f8c59 100644
--- a/src/mainboard/google/slippy/variants/leon/Makefile.inc
+++ b/src/mainboard/google/slippy/variants/leon/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 ## DIMM SPD for on-board memory
 SPD_BIN = $(obj)/spd.bin
diff --git a/src/mainboard/google/slippy/variants/peppy/Makefile.inc b/src/mainboard/google/slippy/variants/peppy/Makefile.inc
index f43ccf5a4b..3a82a539e3 100644
--- a/src/mainboard/google/slippy/variants/peppy/Makefile.inc
+++ b/src/mainboard/google/slippy/variants/peppy/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 ## DIMM SPD for on-board memory
 SPD_BIN = $(obj)/spd.bin
diff --git a/src/mainboard/google/slippy/variants/wolf/Makefile.inc b/src/mainboard/google/slippy/variants/wolf/Makefile.inc
index 249f5633e8..926359d860 100644
--- a/src/mainboard/google/slippy/variants/wolf/Makefile.inc
+++ b/src/mainboard/google/slippy/variants/wolf/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 ## DIMM SPD for on-board memory
 SPD_BIN = $(obj)/spd.bin
diff --git a/src/mainboard/google/smaug/Kconfig b/src/mainboard/google/smaug/Kconfig
index 0d3e879572..53670dec24 100644
--- a/src/mainboard/google/smaug/Kconfig
+++ b/src/mainboard/google/smaug/Kconfig
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 if BOARD_GOOGLE_SMAUG
 
diff --git a/src/mainboard/google/smaug/Makefile.inc b/src/mainboard/google/smaug/Makefile.inc
index 7b848774c5..8194d0bb56 100644
--- a/src/mainboard/google/smaug/Makefile.inc
+++ b/src/mainboard/google/smaug/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 # Add a handler for BCT config files
 $(call add-special-class,bct-cfg)
diff --git a/src/mainboard/google/smaug/bct/Makefile.inc b/src/mainboard/google/smaug/bct/Makefile.inc
index 4147ba6d3f..b5909f5ff2 100644
--- a/src/mainboard/google/smaug/bct/Makefile.inc
+++ b/src/mainboard/google/smaug/bct/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bct-cfg-$(CONFIG_SMAUG_BCT_CFG_EMMC) += emmc.cfg
 bct-cfg-$(CONFIG_SMAUG_BCT_CFG_SPI) += spi.cfg
diff --git a/src/mainboard/google/smaug/bct/cfg2inc.sh b/src/mainboard/google/smaug/bct/cfg2inc.sh
index d7b6c46495..30e24c0060 100644
--- a/src/mainboard/google/smaug/bct/cfg2inc.sh
+++ b/src/mainboard/google/smaug/bct/cfg2inc.sh
@@ -3,14 +3,7 @@
 # This file is part of the coreboot project.
 #
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
+# SPDX-License-Identifier: GPL-2.0-only
 
 bct_cfg2inc() {
 	local in_file="$1"
diff --git a/src/mainboard/google/smaug/devicetree.cb b/src/mainboard/google/smaug/devicetree.cb
index d90b4ea376..15c1f01cc5 100644
--- a/src/mainboard/google/smaug/devicetree.cb
+++ b/src/mainboard/google/smaug/devicetree.cb
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 chip soc/nvidia/tegra210
 	device cpu_cluster 0 on
diff --git a/src/mainboard/google/storm/Kconfig b/src/mainboard/google/storm/Kconfig
index 6095354bc8..a5a3acf228 100644
--- a/src/mainboard/google/storm/Kconfig
+++ b/src/mainboard/google/storm/Kconfig
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 if BOARD_GOOGLE_STORM
 
diff --git a/src/mainboard/google/storm/Makefile.inc b/src/mainboard/google/storm/Makefile.inc
index e3c199209b..3bc81662a2 100644
--- a/src/mainboard/google/storm/Makefile.inc
+++ b/src/mainboard/google/storm/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += bootblock.c
 bootblock-y += cdp.c
diff --git a/src/mainboard/google/storm/devicetree.cb b/src/mainboard/google/storm/devicetree.cb
index c8c8a8251f..cb4e79cc89 100644
--- a/src/mainboard/google/storm/devicetree.cb
+++ b/src/mainboard/google/storm/devicetree.cb
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 chip soc/qualcomm/ipq806x
 	device cpu_cluster 0 on end
diff --git a/src/mainboard/google/stout/Makefile.inc b/src/mainboard/google/stout/Makefile.inc
index 5cc2bd4ced..3a038b7a49 100644
--- a/src/mainboard/google/stout/Makefile.inc
+++ b/src/mainboard/google/stout/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 ramstage-y += ec.c
 
diff --git a/src/mainboard/google/stout/cmos.layout b/src/mainboard/google/stout/cmos.layout
index 615ff29dce..1131406a90 100644
--- a/src/mainboard/google/stout/cmos.layout
+++ b/src/mainboard/google/stout/cmos.layout
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 # -----------------------------------------------------------------
 entries
diff --git a/src/mainboard/google/trogdor/Makefile.inc b/src/mainboard/google/trogdor/Makefile.inc
index 3586db5805..1d4c903d6b 100644
--- a/src/mainboard/google/trogdor/Makefile.inc
+++ b/src/mainboard/google/trogdor/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += memlayout.ld
 bootblock-y += boardid.c
diff --git a/src/mainboard/google/veyron/Kconfig b/src/mainboard/google/veyron/Kconfig
index db72485307..46b9bfec58 100644
--- a/src/mainboard/google/veyron/Kconfig
+++ b/src/mainboard/google/veyron/Kconfig
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 config BOARD_GOOGLE_VEYRON # dummy option to be selected by variant boards
 	def_bool n
diff --git a/src/mainboard/google/veyron/Makefile.inc b/src/mainboard/google/veyron/Makefile.inc
index 5bcdb013cd..5e96068fc8 100644
--- a/src/mainboard/google/veyron/Makefile.inc
+++ b/src/mainboard/google/veyron/Makefile.inc
@@ -2,15 +2,8 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
+
 bootblock-y += bootblock.c
 bootblock-y += boardid.c
 bootblock-y += chromeos.c
diff --git a/src/mainboard/google/veyron/devicetree.cb b/src/mainboard/google/veyron/devicetree.cb
index ca359f40de..17d7115fcd 100644
--- a/src/mainboard/google/veyron/devicetree.cb
+++ b/src/mainboard/google/veyron/devicetree.cb
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 chip soc/rockchip/rk3288
 	device cpu_cluster 0 on end
diff --git a/src/mainboard/google/veyron_mickey/Kconfig b/src/mainboard/google/veyron_mickey/Kconfig
index 7f790cbf38..d1d18ba91f 100644
--- a/src/mainboard/google/veyron_mickey/Kconfig
+++ b/src/mainboard/google/veyron_mickey/Kconfig
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 if BOARD_GOOGLE_VEYRON_MICKEY
 
diff --git a/src/mainboard/google/veyron_mickey/Makefile.inc b/src/mainboard/google/veyron_mickey/Makefile.inc
index 5bcdb013cd..5e96068fc8 100644
--- a/src/mainboard/google/veyron_mickey/Makefile.inc
+++ b/src/mainboard/google/veyron_mickey/Makefile.inc
@@ -2,15 +2,8 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
+
 bootblock-y += bootblock.c
 bootblock-y += boardid.c
 bootblock-y += chromeos.c
diff --git a/src/mainboard/google/veyron_mickey/devicetree.cb b/src/mainboard/google/veyron_mickey/devicetree.cb
index 374dccb6a6..8dd456a99c 100644
--- a/src/mainboard/google/veyron_mickey/devicetree.cb
+++ b/src/mainboard/google/veyron_mickey/devicetree.cb
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 chip soc/rockchip/rk3288
 	device cpu_cluster 0 on end
diff --git a/src/mainboard/google/veyron_rialto/Kconfig b/src/mainboard/google/veyron_rialto/Kconfig
index a9f85a2343..09db4eba27 100644
--- a/src/mainboard/google/veyron_rialto/Kconfig
+++ b/src/mainboard/google/veyron_rialto/Kconfig
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 if BOARD_GOOGLE_VEYRON_RIALTO
 
diff --git a/src/mainboard/google/veyron_rialto/Makefile.inc b/src/mainboard/google/veyron_rialto/Makefile.inc
index 5bcdb013cd..5e96068fc8 100644
--- a/src/mainboard/google/veyron_rialto/Makefile.inc
+++ b/src/mainboard/google/veyron_rialto/Makefile.inc
@@ -2,15 +2,8 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
+
 bootblock-y += bootblock.c
 bootblock-y += boardid.c
 bootblock-y += chromeos.c
diff --git a/src/mainboard/google/veyron_rialto/devicetree.cb b/src/mainboard/google/veyron_rialto/devicetree.cb
index e2a1548a56..ca064f9843 100644
--- a/src/mainboard/google/veyron_rialto/devicetree.cb
+++ b/src/mainboard/google/veyron_rialto/devicetree.cb
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 chip soc/rockchip/rk3288
 	device cpu_cluster 0 on end
diff --git a/src/mainboard/google/volteer/variants/ripto/Makefile.inc b/src/mainboard/google/volteer/variants/ripto/Makefile.inc
index ebfdbd5a73..b584cdace4 100644
--- a/src/mainboard/google/volteer/variants/ripto/Makefile.inc
+++ b/src/mainboard/google/volteer/variants/ripto/Makefile.inc
@@ -2,15 +2,7 @@
 ## This file is part of the coreboot project.
 ##
 ##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; version 2 of the License.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
+## SPDX-License-Identifier: GPL-2.0-only
 
 SPD_SOURCES = SPD_LPDDR4X_200b_8bank_1Rx16_16Gb_DDP_4267   # 0b0000