libpayload: Add board id parsing

Make board ID value supplied in the coreboot table available to the
bootloader on all three architectures.

BUG=chrome-os-partner:30489
TEST=none yet

Change-Id: I6c2d39e94212b55650929d7d99896581d23f789d
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 723e4a600a5d3a03e960169b04f8322f6dd2486b
Original-Change-Id: I7847bd9fe2d000a29c7ae95144f4868d926fb198
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/210430
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: http://review.coreboot.org/8730
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/payloads/libpayload/include/coreboot_tables.h b/payloads/libpayload/include/coreboot_tables.h
index e20249d..53b5890 100644
--- a/payloads/libpayload/include/coreboot_tables.h
+++ b/payloads/libpayload/include/coreboot_tables.h
@@ -205,6 +205,14 @@
 	uint64_t cbmem_tab;
 };
 
+#define CB_TAG_BOARD_ID		0x0025
+struct cb_board_id {
+	uint32_t tag;
+	uint32_t size;
+	/* Board ID as retrieved from the board revision GPIOs. */
+	uint32_t board_id;
+};
+
 #define CB_TAG_X86_ROM_MTRR	0x0021
 struct cb_x86_rom_mtrr {
 	uint32_t tag;