| commit | b30baa98fc5a90b86f41f33e08deec4f17c477c8 | [log] [tgz] |
|---|---|---|
| author | Mattijs Korpershoek <mkorpershoek@baylibre.com> | Wed Jul 10 10:40:05 2024 +0200 |
| committer | Tom Rini <trini@konsulko.com> | Thu Jul 18 13:51:30 2024 -0600 |
| tree | 1070bcb520507e4c549a68cbb81e0018fecdaa8d | |
| parent | b47db023d3bf88ef868fdb2c07380368b741a41e [diff] |
bootstd: Add a bootmeth for Android 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: 3.a. Get slot (A/B) from BCB 3.b. Run AVB (Android Verified Boot) on boot partitions 3.c. Load boot and vendor_boot partitions 3.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. [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/ Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Julien Masson <jmasson@baylibre.com> Tested-by: Guillaume La Roque <glaroque@baylibre.com> Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>