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-...@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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