mb/google/kahlee: Use SPDX for GPL-2.0-only files

Done with sed and God Lines. Only done for C-like code for now.

Change-Id: I78f386eb47fc9b91992884e309dbbf33fb3d4e92
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40179
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

75 files changed, 150 insertions, 957 deletions

diff --git a/src/mainboard/google/kahlee/BiosCallOuts.c b/src/mainboard/google/kahlee/BiosCallOuts.c
index d9d51c9820..f9dcf26919 100644
--- a/src/mainboard/google/kahlee/BiosCallOuts.c
+++ b/src/mainboard/google/kahlee/BiosCallOuts.c
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <amdblocks/agesawrapper.h>
 #include <amdblocks/BiosCallOuts.h>
diff --git a/src/mainboard/google/kahlee/OemCustomize.c b/src/mainboard/google/kahlee/OemCustomize.c
index f39f946714..5715f18013 100644
--- a/src/mainboard/google/kahlee/OemCustomize.c
+++ b/src/mainboard/google/kahlee/OemCustomize.c
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <chip.h>
 #include <amdblocks/agesawrapper.h>
diff --git a/src/mainboard/google/kahlee/bootblock/bootblock.c b/src/mainboard/google/kahlee/bootblock/bootblock.c
index 805793d049..613b35b41e 100644
--- a/src/mainboard/google/kahlee/bootblock/bootblock.c
+++ b/src/mainboard/google/kahlee/bootblock/bootblock.c
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/variants.h>
 #include <bootblock_common.h>
diff --git a/src/mainboard/google/kahlee/chromeos.c b/src/mainboard/google/kahlee/chromeos.c
index f02092883e..06ec2ec6db 100644
--- a/src/mainboard/google/kahlee/chromeos.c
+++ b/src/mainboard/google/kahlee/chromeos.c
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <vendorcode/google/chromeos/chromeos.h>
 #include <boot/coreboot_tables.h>
diff --git a/src/mainboard/google/kahlee/dsdt.asl b/src/mainboard/google/kahlee/dsdt.asl
index 574145f4e5..56611c5d75 100644
--- a/src/mainboard/google/kahlee/dsdt.asl
+++ b/src/mainboard/google/kahlee/dsdt.asl
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <variant/ec.h>
 
diff --git a/src/mainboard/google/kahlee/ec.c b/src/mainboard/google/kahlee/ec.c
index cb4723b456..32f3d3532a 100644
--- a/src/mainboard/google/kahlee/ec.c
+++ b/src/mainboard/google/kahlee/ec.c
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <arch/acpi.h>
 #include <console/console.h>
diff --git a/src/mainboard/google/kahlee/irq_tables.c b/src/mainboard/google/kahlee/irq_tables.c
index b6dfd5d60b..34dfdae52c 100644
--- a/src/mainboard/google/kahlee/irq_tables.c
+++ b/src/mainboard/google/kahlee/irq_tables.c
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <console/console.h>
 #include <string.h>
diff --git a/src/mainboard/google/kahlee/mainboard.c b/src/mainboard/google/kahlee/mainboard.c
index 968cd7ce69..24297a3861 100644
--- a/src/mainboard/google/kahlee/mainboard.c
+++ b/src/mainboard/google/kahlee/mainboard.c
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <string.h>
 #include <console/console.h>
diff --git a/src/mainboard/google/kahlee/mptable.c b/src/mainboard/google/kahlee/mptable.c
index 130a728483..008639a2cf 100644
--- a/src/mainboard/google/kahlee/mptable.c
+++ b/src/mainboard/google/kahlee/mptable.c
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <arch/smp/mpspec.h>
 #include <arch/ioapic.h>
diff --git a/src/mainboard/google/kahlee/romstage.c b/src/mainboard/google/kahlee/romstage.c
index bfadb5c6f2..aba3ff7994 100644
--- a/src/mainboard/google/kahlee/romstage.c
+++ b/src/mainboard/google/kahlee/romstage.c
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <amdblocks/dimm_spd.h>
 #include <baseboard/variants.h>
diff --git a/src/mainboard/google/kahlee/smihandler.c b/src/mainboard/google/kahlee/smihandler.c
index a13dc6c597..078c9cda4c 100644
--- a/src/mainboard/google/kahlee/smihandler.c
+++ b/src/mainboard/google/kahlee/smihandler.c
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <arch/acpi.h>
 #include <cpu/x86/smm.h>
diff --git a/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/gpe.asl b/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/gpe.asl
index 05cd0b97f5..a6b622df78 100644
--- a/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/gpe.asl
+++ b/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/gpe.asl
@@ -1,14 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/gpe.asl>
diff --git a/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/mainboard.asl b/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/mainboard.asl
index d026e9af76..304b4f0678 100644
--- a/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/mainboard.asl
+++ b/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/mainboard.asl
@@ -1,15 +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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/mainboard.asl>
 #include <baseboard/acpi/audio.asl>
diff --git a/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/routing.asl b/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/routing.asl
index c1896c37e5..ee9fd82e25 100644
--- a/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/routing.asl
+++ b/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/routing.asl
@@ -1,14 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/routing.asl>
diff --git a/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/sleep.asl b/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/sleep.asl
index a401b3a24d..998ee6f301 100644
--- a/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/sleep.asl
+++ b/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/sleep.asl
@@ -1,14 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/sleep.asl>
diff --git a/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/thermal.asl b/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/thermal.asl
index a7e511cbec..597335ec70 100644
--- a/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/thermal.asl
+++ b/src/mainboard/google/kahlee/variants/aleena/include/variant/acpi/thermal.asl
@@ -1,14 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/thermal.asl>
diff --git a/src/mainboard/google/kahlee/variants/aleena/include/variant/ec.h b/src/mainboard/google/kahlee/variants/aleena/include/variant/ec.h
index 0aa2e213bb..201305df2b 100644
--- a/src/mainboard/google/kahlee/variants/aleena/include/variant/ec.h
+++ b/src/mainboard/google/kahlee/variants/aleena/include/variant/ec.h
@@ -1,15 +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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/ec.h>
 
diff --git a/src/mainboard/google/kahlee/variants/aleena/include/variant/gpio.h b/src/mainboard/google/kahlee/variants/aleena/include/variant/gpio.h
index b9f1e45c25..37d619d8cd 100644
--- a/src/mainboard/google/kahlee/variants/aleena/include/variant/gpio.h
+++ b/src/mainboard/google/kahlee/variants/aleena/include/variant/gpio.h
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/gpio.h>
 
diff --git a/src/mainboard/google/kahlee/variants/aleena/include/variant/thermal.h b/src/mainboard/google/kahlee/variants/aleena/include/variant/thermal.h
index b04194fb52..4cc9eb18bb 100644
--- a/src/mainboard/google/kahlee/variants/aleena/include/variant/thermal.h
+++ b/src/mainboard/google/kahlee/variants/aleena/include/variant/thermal.h
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #ifndef THERMAL_H
 #define THERMAL_H
diff --git a/src/mainboard/google/kahlee/variants/baseboard/OemCustomize.c b/src/mainboard/google/kahlee/variants/baseboard/OemCustomize.c
index ab128c556b..9fccc6df6b 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/OemCustomize.c
+++ b/src/mainboard/google/kahlee/variants/baseboard/OemCustomize.c
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <amdblocks/agesawrapper.h>
 #include <variant/gpio.h>
diff --git a/src/mainboard/google/kahlee/variants/baseboard/gpio.c b/src/mainboard/google/kahlee/variants/baseboard/gpio.c
index f21a97f845..4fb60b1fcf 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/gpio.c
+++ b/src/mainboard/google/kahlee/variants/baseboard/gpio.c
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/variants.h>
 #include <soc/gpio.h>
diff --git a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/audio.asl b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/audio.asl
index 0084325102..75b61c2d84 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/audio.asl
+++ b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/audio.asl
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <amdblocks/acpimmio_map.h>
 
diff --git a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/gpe.asl b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/gpe.asl
index c2be6f320e..e7b777df2c 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/gpe.asl
+++ b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/gpe.asl
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 Scope (\_GPE)
 {
diff --git a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/mainboard.asl b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/mainboard.asl
index c118337c04..168bf566b8 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/mainboard.asl
+++ b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/mainboard.asl
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 /* Memory related values */
 Name (LOMH, 0x0)	/* Start of unused memory in C0000-E0000 range */
diff --git a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/routing.asl b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/routing.asl
index fd760f4686..f989bbb6d8 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/routing.asl
+++ b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/routing.asl
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 /*
  * #include <arch/acpi.h>
diff --git a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/sleep.asl b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/sleep.asl
index 2dbefb9931..9540f3c6f6 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/sleep.asl
+++ b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/sleep.asl
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 /* Wake status package */
 Name (WKST, Package() { Zero, Zero })
diff --git a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/thermal.asl b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/thermal.asl
index 54b7d4e4d4..efde141f73 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/thermal.asl
+++ b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/thermal.asl
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <variant/thermal.h>
 
diff --git a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/ec.h b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/ec.h
index 2d8d348df1..dcc6ac57bf 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/ec.h
+++ b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/ec.h
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #ifndef MAINBOARD_EC_H
 #define MAINBOARD_EC_H
diff --git a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/gpio.h b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/gpio.h
index f1de4abe80..7893a54155 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/gpio.h
+++ b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/gpio.h
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #ifndef __BASEBOARD_GPIO_H__
 #define __BASEBOARD_GPIO_H__
diff --git a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/variants.h b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/variants.h
index 348f24f9b1..02d413f6a6 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/variants.h
+++ b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/variants.h
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 
 #ifndef __BASEBOARD_VARIANTS_H__
diff --git a/src/mainboard/google/kahlee/variants/baseboard/mainboard.c b/src/mainboard/google/kahlee/variants/baseboard/mainboard.c
index 95cbd911e0..fab813f08f 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/mainboard.c
+++ b/src/mainboard/google/kahlee/variants/baseboard/mainboard.c
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <ec/google/chromeec/ec.h>
 #include <baseboard/variants.h>
diff --git a/src/mainboard/google/kahlee/variants/baseboard/memory.c b/src/mainboard/google/kahlee/variants/baseboard/memory.c
index 23d0f7974b..0e54445e67 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/memory.c
+++ b/src/mainboard/google/kahlee/variants/baseboard/memory.c
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/variants.h>
 #include <console/console.h>
diff --git a/src/mainboard/google/kahlee/variants/baseboard/romstage.c b/src/mainboard/google/kahlee/variants/baseboard/romstage.c
index cbb4d3054d..0ef0c52547 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/romstage.c
+++ b/src/mainboard/google/kahlee/variants/baseboard/romstage.c
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/variants.h>
 #include <ec/google/chromeec/ec.h>
diff --git a/src/mainboard/google/kahlee/variants/baseboard/tpm_tis.c b/src/mainboard/google/kahlee/variants/baseboard/tpm_tis.c
index b3c6fd5450..df685f3719 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/tpm_tis.c
+++ b/src/mainboard/google/kahlee/variants/baseboard/tpm_tis.c
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <security/tpm/tis.h>
 #include <soc/gpio.h>
diff --git a/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/gpe.asl b/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/gpe.asl
index 05cd0b97f5..a6b622df78 100644
--- a/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/gpe.asl
+++ b/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/gpe.asl
@@ -1,14 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/gpe.asl>
diff --git a/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/mainboard.asl b/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/mainboard.asl
index d026e9af76..304b4f0678 100644
--- a/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/mainboard.asl
+++ b/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/mainboard.asl
@@ -1,15 +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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/mainboard.asl>
 #include <baseboard/acpi/audio.asl>
diff --git a/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/routing.asl b/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/routing.asl
index c1896c37e5..ee9fd82e25 100644
--- a/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/routing.asl
+++ b/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/routing.asl
@@ -1,14 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/routing.asl>
diff --git a/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/sleep.asl b/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/sleep.asl
index a401b3a24d..998ee6f301 100644
--- a/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/sleep.asl
+++ b/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/sleep.asl
@@ -1,14 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/sleep.asl>
diff --git a/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/thermal.asl b/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/thermal.asl
index a7e511cbec..597335ec70 100644
--- a/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/thermal.asl
+++ b/src/mainboard/google/kahlee/variants/careena/include/variant/acpi/thermal.asl
@@ -1,14 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/thermal.asl>
diff --git a/src/mainboard/google/kahlee/variants/careena/include/variant/ec.h b/src/mainboard/google/kahlee/variants/careena/include/variant/ec.h
index e90724ef52..621ac68c50 100644
--- a/src/mainboard/google/kahlee/variants/careena/include/variant/ec.h
+++ b/src/mainboard/google/kahlee/variants/careena/include/variant/ec.h
@@ -1,15 +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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/ec.h>
 
diff --git a/src/mainboard/google/kahlee/variants/careena/include/variant/gpio.h b/src/mainboard/google/kahlee/variants/careena/include/variant/gpio.h
index bc01d14833..4884fc0cbb 100644
--- a/src/mainboard/google/kahlee/variants/careena/include/variant/gpio.h
+++ b/src/mainboard/google/kahlee/variants/careena/include/variant/gpio.h
@@ -1,15 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/gpio.h>
diff --git a/src/mainboard/google/kahlee/variants/careena/include/variant/thermal.h b/src/mainboard/google/kahlee/variants/careena/include/variant/thermal.h
index b04194fb52..4cc9eb18bb 100644
--- a/src/mainboard/google/kahlee/variants/careena/include/variant/thermal.h
+++ b/src/mainboard/google/kahlee/variants/careena/include/variant/thermal.h
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #ifndef THERMAL_H
 #define THERMAL_H
diff --git a/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/gpe.asl b/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/gpe.asl
index 750254f4ad..a6b622df78 100644
--- a/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/gpe.asl
+++ b/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/gpe.asl
@@ -1,15 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/gpe.asl>
diff --git a/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/mainboard.asl b/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/mainboard.asl
index 01d015c89e..304b4f0678 100644
--- a/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/mainboard.asl
+++ b/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/mainboard.asl
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/mainboard.asl>
 #include <baseboard/acpi/audio.asl>
diff --git a/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/routing.asl b/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/routing.asl
index 95b37951c2..ee9fd82e25 100644
--- a/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/routing.asl
+++ b/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/routing.asl
@@ -1,15 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/routing.asl>
diff --git a/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/sleep.asl b/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/sleep.asl
index ca791f011e..998ee6f301 100644
--- a/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/sleep.asl
+++ b/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/sleep.asl
@@ -1,15 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/sleep.asl>
diff --git a/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/thermal.asl b/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/thermal.asl
index cf0aee679f..597335ec70 100644
--- a/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/thermal.asl
+++ b/src/mainboard/google/kahlee/variants/grunt/include/variant/acpi/thermal.asl
@@ -1,15 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/thermal.asl>
diff --git a/src/mainboard/google/kahlee/variants/grunt/include/variant/gpio.h b/src/mainboard/google/kahlee/variants/grunt/include/variant/gpio.h
index bc01d14833..4884fc0cbb 100644
--- a/src/mainboard/google/kahlee/variants/grunt/include/variant/gpio.h
+++ b/src/mainboard/google/kahlee/variants/grunt/include/variant/gpio.h
@@ -1,15 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/gpio.h>
diff --git a/src/mainboard/google/kahlee/variants/grunt/include/variant/thermal.h b/src/mainboard/google/kahlee/variants/grunt/include/variant/thermal.h
index b04194fb52..4cc9eb18bb 100644
--- a/src/mainboard/google/kahlee/variants/grunt/include/variant/thermal.h
+++ b/src/mainboard/google/kahlee/variants/grunt/include/variant/thermal.h
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #ifndef THERMAL_H
 #define THERMAL_H
diff --git a/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/gpe.asl b/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/gpe.asl
index 05cd0b97f5..a6b622df78 100644
--- a/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/gpe.asl
+++ b/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/gpe.asl
@@ -1,14 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/gpe.asl>
diff --git a/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/mainboard.asl b/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/mainboard.asl
index d026e9af76..304b4f0678 100644
--- a/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/mainboard.asl
+++ b/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/mainboard.asl
@@ -1,15 +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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/mainboard.asl>
 #include <baseboard/acpi/audio.asl>
diff --git a/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/routing.asl b/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/routing.asl
index c1896c37e5..ee9fd82e25 100644
--- a/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/routing.asl
+++ b/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/routing.asl
@@ -1,14 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/routing.asl>
diff --git a/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/sleep.asl b/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/sleep.asl
index a401b3a24d..998ee6f301 100644
--- a/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/sleep.asl
+++ b/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/sleep.asl
@@ -1,14 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/sleep.asl>
diff --git a/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/thermal.asl b/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/thermal.asl
index a7e511cbec..597335ec70 100644
--- a/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/thermal.asl
+++ b/src/mainboard/google/kahlee/variants/liara/include/variant/acpi/thermal.asl
@@ -1,14 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/thermal.asl>
diff --git a/src/mainboard/google/kahlee/variants/liara/include/variant/ec.h b/src/mainboard/google/kahlee/variants/liara/include/variant/ec.h
index e90724ef52..621ac68c50 100644
--- a/src/mainboard/google/kahlee/variants/liara/include/variant/ec.h
+++ b/src/mainboard/google/kahlee/variants/liara/include/variant/ec.h
@@ -1,15 +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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/ec.h>
 
diff --git a/src/mainboard/google/kahlee/variants/liara/include/variant/gpio.h b/src/mainboard/google/kahlee/variants/liara/include/variant/gpio.h
index bc01d14833..4884fc0cbb 100644
--- a/src/mainboard/google/kahlee/variants/liara/include/variant/gpio.h
+++ b/src/mainboard/google/kahlee/variants/liara/include/variant/gpio.h
@@ -1,15 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/gpio.h>
diff --git a/src/mainboard/google/kahlee/variants/liara/include/variant/thermal.h b/src/mainboard/google/kahlee/variants/liara/include/variant/thermal.h
index b04194fb52..4cc9eb18bb 100644
--- a/src/mainboard/google/kahlee/variants/liara/include/variant/thermal.h
+++ b/src/mainboard/google/kahlee/variants/liara/include/variant/thermal.h
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #ifndef THERMAL_H
 #define THERMAL_H
diff --git a/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/gpe.asl b/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/gpe.asl
index 750254f4ad..a6b622df78 100644
--- a/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/gpe.asl
+++ b/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/gpe.asl
@@ -1,15 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/gpe.asl>
diff --git a/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/mainboard.asl b/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/mainboard.asl
index 01d015c89e..304b4f0678 100644
--- a/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/mainboard.asl
+++ b/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/mainboard.asl
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/mainboard.asl>
 #include <baseboard/acpi/audio.asl>
diff --git a/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/routing.asl b/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/routing.asl
index 95b37951c2..ee9fd82e25 100644
--- a/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/routing.asl
+++ b/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/routing.asl
@@ -1,15 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/routing.asl>
diff --git a/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/sleep.asl b/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/sleep.asl
index ca791f011e..998ee6f301 100644
--- a/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/sleep.asl
+++ b/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/sleep.asl
@@ -1,15 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/sleep.asl>
diff --git a/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/thermal.asl b/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/thermal.asl
index cf0aee679f..597335ec70 100644
--- a/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/thermal.asl
+++ b/src/mainboard/google/kahlee/variants/nuwani/include/variant/acpi/thermal.asl
@@ -1,15 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/thermal.asl>
diff --git a/src/mainboard/google/kahlee/variants/nuwani/include/variant/ec.h b/src/mainboard/google/kahlee/variants/nuwani/include/variant/ec.h
index 89c53be8f1..d6a7fb1200 100644
--- a/src/mainboard/google/kahlee/variants/nuwani/include/variant/ec.h
+++ b/src/mainboard/google/kahlee/variants/nuwani/include/variant/ec.h
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/ec.h>
 
diff --git a/src/mainboard/google/kahlee/variants/nuwani/include/variant/gpio.h b/src/mainboard/google/kahlee/variants/nuwani/include/variant/gpio.h
index b9f1e45c25..37d619d8cd 100644
--- a/src/mainboard/google/kahlee/variants/nuwani/include/variant/gpio.h
+++ b/src/mainboard/google/kahlee/variants/nuwani/include/variant/gpio.h
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/gpio.h>
 
diff --git a/src/mainboard/google/kahlee/variants/nuwani/include/variant/thermal.h b/src/mainboard/google/kahlee/variants/nuwani/include/variant/thermal.h
index b04194fb52..4cc9eb18bb 100644
--- a/src/mainboard/google/kahlee/variants/nuwani/include/variant/thermal.h
+++ b/src/mainboard/google/kahlee/variants/nuwani/include/variant/thermal.h
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #ifndef THERMAL_H
 #define THERMAL_H
diff --git a/src/mainboard/google/kahlee/variants/nuwani/mainboard.c b/src/mainboard/google/kahlee/variants/nuwani/mainboard.c
index cf10d8f2dd..f54b0dbc23 100644
--- a/src/mainboard/google/kahlee/variants/nuwani/mainboard.c
+++ b/src/mainboard/google/kahlee/variants/nuwani/mainboard.c
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <ec/google/chromeec/ec.h>
 #include <baseboard/variants.h>
diff --git a/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/gpe.asl b/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/gpe.asl
index 750254f4ad..a6b622df78 100644
--- a/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/gpe.asl
+++ b/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/gpe.asl
@@ -1,15 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/gpe.asl>
diff --git a/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/mainboard.asl b/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/mainboard.asl
index 01d015c89e..304b4f0678 100644
--- a/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/mainboard.asl
+++ b/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/mainboard.asl
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/mainboard.asl>
 #include <baseboard/acpi/audio.asl>
diff --git a/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/routing.asl b/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/routing.asl
index 95b37951c2..ee9fd82e25 100644
--- a/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/routing.asl
+++ b/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/routing.asl
@@ -1,15 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/routing.asl>
diff --git a/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/sleep.asl b/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/sleep.asl
index ca791f011e..998ee6f301 100644
--- a/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/sleep.asl
+++ b/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/sleep.asl
@@ -1,15 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/sleep.asl>
diff --git a/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/thermal.asl b/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/thermal.asl
index cf0aee679f..597335ec70 100644
--- a/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/thermal.asl
+++ b/src/mainboard/google/kahlee/variants/treeya/include/variant/acpi/thermal.asl
@@ -1,15 +1,4 @@
-/*
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/acpi/thermal.asl>
diff --git a/src/mainboard/google/kahlee/variants/treeya/include/variant/ec.h b/src/mainboard/google/kahlee/variants/treeya/include/variant/ec.h
index 89c53be8f1..d6a7fb1200 100644
--- a/src/mainboard/google/kahlee/variants/treeya/include/variant/ec.h
+++ b/src/mainboard/google/kahlee/variants/treeya/include/variant/ec.h
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/ec.h>
 
diff --git a/src/mainboard/google/kahlee/variants/treeya/include/variant/gpio.h b/src/mainboard/google/kahlee/variants/treeya/include/variant/gpio.h
index b9f1e45c25..37d619d8cd 100644
--- a/src/mainboard/google/kahlee/variants/treeya/include/variant/gpio.h
+++ b/src/mainboard/google/kahlee/variants/treeya/include/variant/gpio.h
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <baseboard/gpio.h>
 
diff --git a/src/mainboard/google/kahlee/variants/treeya/include/variant/thermal.h b/src/mainboard/google/kahlee/variants/treeya/include/variant/thermal.h
index b04194fb52..4cc9eb18bb 100644
--- a/src/mainboard/google/kahlee/variants/treeya/include/variant/thermal.h
+++ b/src/mainboard/google/kahlee/variants/treeya/include/variant/thermal.h
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #ifndef THERMAL_H
 #define THERMAL_H
diff --git a/src/mainboard/google/kahlee/variants/treeya/mainboard.c b/src/mainboard/google/kahlee/variants/treeya/mainboard.c
index cf10d8f2dd..f54b0dbc23 100644
--- a/src/mainboard/google/kahlee/variants/treeya/mainboard.c
+++ b/src/mainboard/google/kahlee/variants/treeya/mainboard.c
@@ -1,16 +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 */
+/* This file is part of the coreboot project. */
 
 #include <ec/google/chromeec/ec.h>
 #include <baseboard/variants.h>