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BOARDIOC_SWITCH_BOOT is required to communicate the boot partition from userspace (OTA subsystem) to board. It can be used to change the system boot behavior. So it's useful for A/B boot or even single boot case. For the board support A/B boot case: 1. Download the new image from the sever 2. Write the new image to the alternative partition 3. Call BOARDCTL_SWITCH_BOOT to the alternative system For single boot partition case: 1. Download the new image from the sever 2. Call BOARDCTL_SWITCH_BOOT and reboot to a small system 3. Write the new image to the main partition in the small system 4. Call BOARDCTL_SWITCH_BOOT again to the main system Change-Id: Ifebb495784ecf06842946a249bec64f75dce894f Signed-off-by: liuhaitao <liuhaitao@xiaomi.com>