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

[Tom Rini]

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 -----------------------------

-- 
Tom
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