[PATCH v2 0/5] bootstd: Add Android support

[Mattijs Korpershoek]

Hi Tom,

On jeu., juin 20, 2024 at 08:23, Tom Rini <trini at konsulko.com> wrote:

> On Thu, Jun 13, 2024 at 12:13:07PM +0200, Mattijs Korpershoek wrote:
>
>> Android boot flow is a bit different than a regular Linux distro.
>> Android relies on multiple partitions in order to boot.
>> 
>> A typical boot flow would be:
>> 1. Parse the Bootloader Control Block (BCB, misc partition)
>> 2. If BCB requested bootonce-bootloader, start fastboot and wait.
>> 3. If BCB requested recovery or normal android, run the following:
>>    a. Get slot (A/B) from BCB
>>    b. Run AVB (Android Verified Boot) on boot partitions
>>    c. Load boot and vendor_boot partitions
>>    d. Load device-tree, ramdisk and boot
>> 
>> The AOSP documentation has more details at [1], [2], [3]
>> 
>> This has been implemented via complex boot scripts such as [4].
>> However, these boot script are neither very maintainable nor generic.
>> Moreover, DISTRO_DEFAULTS is being deprecated [5].
>> 
>> Add a generic Android bootflow implementation for bootstd.
>> 
>> For this initial version, only boot image v4 is supported.
>> 
>> This has been tested on sandbox using:
>> $ ./test/py/test.py --bd sandbox --build -k test_ut
>> 
>> This has also been tested on the AM62X SK EVM using TI's Android SDK[6]
>> To test on TI board, the following (WIP) patch is needed as well:
>> https://gitlab.baylibre.com/baylibre/ti/ti-u-boot/-/commit/84cceb912bccd7cdd7f9dd69bca0e5d987a1fd04
>> 
>> [1] https://source.android.com/docs/core/architecture/bootloader
>> [2] https://source.android.com/docs/core/architecture/partitions
>> [3] https://source.android.com/docs/core/architecture/partitions/generic-boot
>> [4] https://source.denx.de/u-boot/u-boot/-/blob/master/include/configs/meson64_android.h
>> [5] https://lore.kernel.org/r/all/20230914165615.1058529-17-sjg@chromium.org/
>> [6] https://software-dl.ti.com/processor-sdk-android/esd/AM62X/09_02_00/docs/android/Overview.html
>
> This leads to failures in CI such as:
> =================================== FAILURES ===================================
> ___________________________ test_ut_dm_init_bootstd ____________________________
> test/py/tests/test_ut.py:555: in test_ut_dm_init_bootstd
>     setup_android_image(u_boot_console)
> test/py/tests/test_ut.py:488: in setup_android_image
>     with open(boot_img, 'rb') as inf:
> E   FileNotFoundError: [Errno 2] No such file or directory: '/tmp/malta64el/bootv4.img'
> ----------------------------- Captured stdout call -----------------------------

Thank you for reporting, and sorry about the CI failure.
I think I need to somehow declare a dependency on the bootv4.img file.

I will send a v3 to fix this.

>
> -- 
> Tom