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Tom Rini 4595600007 Merge patch series "bootstd: Add Android support" 
Mattijs Korpershoek <mkorpershoek@baylibre.com> says:

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:
84cceb912b

[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
2024-07-18 17:03:47 -06:00
..
tests Merge patch series "bootstd: Add Android support" 2024-07-18 17:03:47 -06:00
.gitignore test/py: Implement pytest infrastructure 2016-01-20 19:06:23 -07:00
conftest.py test: Support tests which can only be run manually 2022-10-31 11:02:44 -04:00
multiplexed_log.css SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
multiplexed_log.py test: Add a way to set the environment for a pytest 2023-02-14 09:43:27 -07:00
pytest.ini test/py: Allow tests to be marked single-threaded only 2022-09-12 18:06:36 -04:00
requirements.txt test/py/requirements.txt: Bump zipp to current release 2024-07-18 07:40:30 -06:00
test.py test: remove unused import from pkg_resources 2024-04-12 08:53:31 -06:00
u_boot_console_base.py test/py: Add support to enable check for bad pattern 2024-06-13 16:31:20 -06:00
u_boot_console_exec_attach.py test: fix pylint error in u_boot_console_exec_attach.py 2021-11-26 22:02:37 +01:00
u_boot_console_sandbox.py test: Decode exceptions only with sandbox 2024-07-04 09:25:21 -06:00
u_boot_spawn.py test: Decode exceptions only with sandbox 2024-07-04 09:25:21 -06:00
u_boot_utils.py test: Add a way to set the environment for a pytest 2023-02-14 09:43:27 -07:00