[U-Boot] [PATCH v5 6/6] env: am57xx: Implement A/B boot process

[Tom Rini <trini@konsulko.com>]

On Fri, Jul 05, 2019 at 03:37:36PM +0300, Igor Opaniuk wrote:

> From: Ruslan Trofymenko <ruslan.trofymenko@linaro.org>
> 
> 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 <ruslan.trofymenko@linaro.org>
> Signed-off-by: Igor Opaniuk <igor.opaniuk@gmail.com>
> Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
> Reviewed-by: Alistair Strachan <astrachan@google.com>
> Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
> Reviewed-by: Simon Glass <sjg@chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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