libpayload: store boot media information in sysinfo

Write boot media information in sysinfo, if it exists. This allows picking the
right CBFS for further files in case there are several.

Change-Id: I75a8ee6b93f349b9f2fab1e82826aba675949c0a
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10869
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
diff --git a/payloads/libpayload/include/coreboot_tables.h b/payloads/libpayload/include/coreboot_tables.h
index 0c516b1..24cbf45 100644
--- a/payloads/libpayload/include/coreboot_tables.h
+++ b/payloads/libpayload/include/coreboot_tables.h
@@ -257,6 +257,17 @@
 	uint32_t erase_cmd;
 };
 
+#define CB_TAG_BOOT_MEDIA_PARAMS 0x0030
+struct cb_boot_media_params {
+	uint32_t tag;
+	uint32_t size;
+	/* offsets are relative to start of boot media */
+	uint64_t fmap_offset;
+	uint64_t cbfs_offset;
+	uint64_t cbfs_size;
+	uint64_t boot_media_size;
+};
+
 #define CB_TAG_SERIALNO		0x002a
 #define CB_MAX_SERIALNO_LENGTH	32