[U-Boot] [PATCH 0/6] Android A/B Bootloader support

[Stanislas BERTRAND]

Hi Alex,

The Android A/B bootloader patch series looks good.

How far along are you to have this work integrated ?

Regards,
Stan

On 04/02/2017 04:49 PM, Alex Deymo wrote:
> An "Android Bootloader" has a lot of requirements about how it should
> behave which Android partners must implement. In particular, the new
> A/B updates [1] added more requirements and flows to the bootloader
> which are not common, on top of the existing flows.
>
> For example, a few uncommon requirements include:
> * Lookup in the BCB (boot control block) whether a "recovery" message
>    is stored. This is used by the recovery environment when applying a
>    multi-stage update in the legacy update model (recovery reboots to
>    recovery again) and for interrumpted factory-reset (a reboot during
>    the factory reset should continue to reboot into factory reset until
>    it is done).
> * A new "repair" mode. In the A/B model, when none of the slots is
>    bootable, the device would boot into repair mode, which is often the
>    same as "bootloader" mode (fastboot).
> * Recovery as root: In newer version of AOSP, it is possible to mount
>    the system image as / without an initramfs, which then frees up the
>    initramfs in the "boot" partition to hold the "recovery" initramfs.
>    This is the default for new devices and required for the A/B setup.
>
> This patchset updates the Android-related headers and introduces new
> commands to boot a recent Android build. This work is based on the
> bootloader used in the Raspberry Pi in Android Things and extensively
> tested there.
>
> [1] https://source.android.com/devices/tech/ota/ab_updates.html
>
>
> Alex Deymo (6):
>    image: Update include/android_image.h
>    image: Implement a function to load Android Images.
>    cmd: Add 'load_android' command to load Android images.
>    disk: Return the partition number in part_get_info_by_name()
>    Initial support for the Android Bootloader flow
>    cmd: Add "boot_android" command.
>
>   README                               |  25 ++-
>   cmd/Kconfig                          |  19 ++
>   cmd/Makefile                         |   2 +
>   cmd/boot_android.c                   | 126 +++++++++++++
>   cmd/load_android.c                   |  56 ++++++
>   common/Kconfig                       |  19 ++
>   common/Makefile                      |   1 +
>   common/android_bootloader.c          | 350 +++++++++++++++++++++++++++++++++++
>   common/fb_mmc.c                      |   6 +-
>   common/image-android.c               |  60 ++++++
>   disk/part.c                          |   2 +-
>   include/android_bootloader.h         |  48 +++++
>   include/android_bootloader_message.h | 174 +++++++++++++++++
>   include/android_image.h              |  24 ++-
>   include/image.h                      |  19 ++
>   include/part.h                       |   3 +-
>   16 files changed, 920 insertions(+), 14 deletions(-)
>   create mode 100644 cmd/boot_android.c
>   create mode 100644 cmd/load_android.c
>   create mode 100644 common/android_bootloader.c
>   create mode 100644 include/android_bootloader.h
>   create mode 100644 include/android_bootloader_message.h
>