On Fri, Jul 05, 2019 at 03:37:36PM +0300, Igor Opaniuk wrote: > From: Ruslan Trofymenko <[email protected]> > > Add support for A/B boot process on AM57xx based boards: > > 1. Define 'slot_suffix' variable (using 'ab_select' command) > 2. Extend 'emmc_android_boot' boot command (add commands for A/B boot > process) > > 'ab_select' command is used to decide which slot should be used for > booting up. A/B metadata resides in 'misc' partition. > > To activate the A/B boot process, the following config options must be > set: > > CONFIG_ANDROID_AB=y > CONFIG_CMD_AB_SELECT=y > > For successful A/B boot, the corresponding A/B infrastructure must be > involved on Android side [1] (including mounting system as root), and > disk must be partitioned accordingly. > > When A/B boot is enabled, there are some known limitations currently > exist (not related to A/B patches, need to be implemented later): > > 1. The 'Verified Boot' sequence is not supported > 2. dev path to system partition (system_a or system_b) is passed via > 'bootargs' as 'root=' argument like 'root=/dev/mmcblk1p12', but > further we'll need to rework it with respect to dm-verity > requirements [2] > > In case when A/B partitions are not present in system (and A/B boot is > enabled), boot up process will be terminated and next message will be > shown: > > "boot_a(b) partition not found" > > [1] https://source.android.com/devices/tech/ota/ab > [2] https://source.android.com/devices/tech/ota/ab/ab_implement#kernel > > Signed-off-by: Ruslan Trofymenko <[email protected]> > Signed-off-by: Igor Opaniuk <[email protected]> > Signed-off-by: Sam Protsenko <[email protected]> > Reviewed-by: Alistair Strachan <[email protected]> > Reviewed-by: Sam Protsenko <[email protected]> > Reviewed-by: Simon Glass <[email protected]>
Applied to u-boot/master, thanks! -- Tom
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