android_ab: Try backup booloader_message
Some devices keep 2 copies of the bootloader_message in the misc
partition and write each in sequence when updating. This ensures that
there is always one valid copy of the bootloader_message. Teach u-boot
to optionally try a backup bootloader_message from a specified offset if
the primary one fails its CRC check.
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
diff --git a/common/Kconfig b/common/Kconfig
index 42baca2..f5ad63c 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -936,6 +936,15 @@
allows a bootloader to try a new version of the system but roll back
to previous version if the new one didn't boot all the way.
+config ANDROID_AB_BACKUP_OFFSET
+ hex "Offset of backup bootloader control"
+ depends on ANDROID_AB
+ default 0x0
+ help
+ If non-zero, a backup bootloader message starting at this offset in
+ the partition will tried in the event that the primary one (starting
+ at offset 0) fails its checksum.
+
endmenu
menu "Blob list"