common: Implement A/B metadata
This patch determines the A/B-specific bootloader message structure
that is the basis for implementation of recovery and A/B update
functions. A/B metadata is stored in this structure and used to decide
which slot should we use to boot the device. Also some basic functions
for A/B metadata manipulation are implemented (like slot selection).
The patch was extracted from commits [1], [2] with some coding style
fixes.
[1] https://android-review.googlesource.com/c/platform/external/u-boot/+/729878/2
[2] https://android-review.googlesource.com/c/platform/external/u-boot/+/729880/2
Signed-off-by: Ruslan Trofymenko <ruslan.trofymenko@linaro.org>
Signed-off-by: Igor Opaniuk <igor.opaniuk@gmail.com>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/common/Kconfig b/common/Kconfig
index 4865a4d..b556b59 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -821,6 +821,16 @@
default 100
depends on UPDATE_TFTP
+config ANDROID_AB
+ bool "Android A/B updates"
+ default n
+ help
+ If enabled, adds support for the new Android A/B update model. This
+ allows the bootloader to select which slot to boot from based on the
+ information provided by userspace via the Android boot_ctrl HAL. This
+ 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.
+
endmenu
menu "Blob list"