This work is in use in Android Things preview U-Boot bootloader for the
raspberry pi. The code is available in
. If I remember correctly, these patches are a cleanup of that code, but
they are a bit old now and would require some rebasing and testing to build
against the latest U-Boot. Would there be interest to integrate these
patches into U-Boot here? I don't think we have changed anything since.
2018-04-13 2:57 GMT+02:00 Stanislas BERTRAND <sbertr...@witekio.com>:
> Hi Alex,
> The Android A/B bootloader patch series looks good.
> How far along are you to have this work integrated ?
> 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  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.
> *>>*  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
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