mb/google/kahlee: Add SKU support

We want to report the board SKU via the SMBIOS tables. Add support for
this, obtaining the ID itself from the EC.

BUG=b:74175244
BRANCH=none
TEST=manually on grunt with another CL:
mosys platform sku
0

Change-Id: I9e08d64df3f89d3703de047dd9ec8e1717e6b212
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-on: https://review.coreboot.org/25011
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

2 files changed, 29 insertions, 0 deletions

diff --git a/src/mainboard/google/kahlee/variants/grunt/Makefile.inc b/src/mainboard/google/kahlee/variants/grunt/Makefile.inc
index 319ff13b77..7a4b9940df 100644
--- a/src/mainboard/google/kahlee/variants/grunt/Makefile.inc
+++ b/src/mainboard/google/kahlee/variants/grunt/Makefile.inc
@@ -14,3 +14,5 @@
 #
 
 subdirs-y += spd
+
+ramstage-y += mainboard.c
diff --git a/src/mainboard/google/kahlee/variants/grunt/mainboard.c b/src/mainboard/google/kahlee/variants/grunt/mainboard.c
new file mode 100644
index 0000000000..c873299bf1
--- /dev/null
+++ b/src/mainboard/google/kahlee/variants/grunt/mainboard.c
@@ -0,0 +1,27 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 Google LLC
+ *
+ * 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.
+ */
+
+#include <ec/google/chromeec/ec.h>
+#include <baseboard/variants.h>
+
+uint8_t variant_board_sku(void)
+{
+	static int sku = -1;
+
+	if (sku == -1)
+		sku = google_chromeec_get_sku_id();
+
+	return sku;
+}