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OEMs and SoC vendors who want to implement A/B system updates must ensuretheir bootloader implements the boot_control HAL and passes thecorrect parameters to the kernel.

Implementing the boot control HAL

A/B-capable bootloaders must implement the boot_control HAL athardware/libhardware/include/hardware/boot_control.h.You can test implementations using thesystem/extras/bootctl utility andsystem/extras/tests/bootloader/.

You must also implement the state machine shown below:

Figure 1. Bootloader state machine

Setting up the kernel

To implement A/B system updates:

Cherrypick the following kernel patch series (if needed):
- If booting without ramdisk and using 'boot as recovery', cherrypick android-review.googlesource.com/#/c/158491/.
- To set up dm-verity without ramdisk, cherrypick android-review.googlesource.com/#/q/status:merged+project:kernel/common+branch:android-3.18+topic:A_B_Changes_3.18.
Ensure kernel command line arguments contain the following extra arguments:.. where the <public-key-id> value is the ID of the publickey used to verify the verity table signature (for details, seedm-verity).
Add the .X509 certificate containing the public key to the system keyring:
1. Copy the .X509 certificate formatted in the .der format to the root of the kernel directory. If the .X509 certificate is formatted as a .pem file, use the following openssl command to convert from .pem to .der format:
2. Build the zImage to include the certificate as part of the system keyring. To verify,check the procfs entry (requires KEYS_CONFIG_DEBUG_PROC_KEYS to be enabled): Successful inclusion of the .X509 certificate indicates the presence of the public key in the system keyring (highlight denotes the public key ID).
3. Replace the space with # and pass it as <public-key-id> in the kernel command line. For example, pass Android:#7e4333f9bba00adfe0ede979e28ed1920492b40f in place of <public-key-id>.

Setting build variables

A/B-capable bootloaders must meet the following build variable criteria:

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Must define for A/B target	`AB_OTA_UPDATER := true` `AB_OTA_PARTITIONS :=` `boot` `system` `vendor` and other partitions updated through `update_engine` (radio,bootloader, etc.) `PRODUCT_PACKAGES +=` `update_engine` `update_verifier` For an example, refer to`/device/google/marlin/+/android-7.1.0_r1/device-common.mk`.You can optionally conduct the post-install (but pre-reboot) dex2oat stepdescribed in Compiling.
Strongly recommended for A/B target	Define `TARGET_NO_RECOVERY := true` Define `BOARD_USES_RECOVERY_AS_BOOT := true` Do not define `BOARD_RECOVERYIMAGE_PARTITION_SIZE`
Cannot define for A/B target	`BOARD_CACHEIMAGE_PARTITION_SIZE` `BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE`
Optional for debug builds	`PRODUCT_PACKAGES_DEBUG += update_engine_client`

Setting partitions (slots)

A/B devices do not need a recovery partition or cache partition becauseAndroid no longer uses these partitions. The data partition is now used for thedownloaded OTA package, and the recovery image code is on the boot partition.All partitions that are A/B-ed should be named as follows (slots are alwaysnamed a, b, etc.): boot_a,boot_b, system_a, system_b,vendor_a, vendor_b.

Cache

For non-A/B updates, the cache partition was used to store downloaded OTApackages and to stash blocks temporarily while applying updates. There wasnever a good way to size the cache partition: how large it needed to bedepended on what updates you wanted to apply. The worst case would be a cachepartition as large as the system image. With A/B updates there's no need tostash blocks (because you're always writing to a partition that isn't currentlyused) and with streaming A/B there's no need to download the whole OTA packagebefore applying it.

Recovery

The recovery RAM disk is now contained in the boot.img file.When going into recovery, the bootloader cannot put theskip_initramfs option on the kernel command line.

For non-A/B updates, the recovery partition contains the code used to applyupdates. A/B updates are applied by update_engine running in theregular booted system image. There is still a recovery mode used to implementfactory data reset and sideloading of update packages (which is where the name'recovery' came from). The code and data for recovery mode is stored in theregular boot partition in a ramdisk; to boot into the system image, thebootloader tells the kernel to skip the ramdisk (otherwise the device boots intorecovery mode. Recovery mode is small (and much of it was already on the bootpartition), so the boot partition doesn't increase in size.

Fstab

The slotselect argument must be on the line forthe A/B-ed partitions. For example:

No partition should be named vendor. Instead, partitionvendor_a or vendor_b will be selected and mounted onthe /vendor mount point.

Kernel slot arguments

The current slot suffix should be passed either through a specific devicetree (DT) node (/firmware/android/slot_suffix) or through theandroidboot.slot_suffix command line argument.

By default, fastboot flashes the current slot on an A/B device. If the update package also contains images for the other, non-current slot, fastboot flashes those images as well. Available options include:

--slot SLOT. Override the default

Bootloader Slot Count Not Found Moto G4 Plus