fastboot

开发者选项里的 oem unlock开关，标识是否允许进行设备解锁(allow)

fastboot oem unlock / fastboot flashing unlock 执行设备解锁，变更设备是否已bootloader解锁的状态(status)

doc

• Flash with Fastboot

• Lock and unlock the bootloader

• Android Fastboot Mode Commands with Examples

• `avb.c: trusty_write_lock_state <https://cs.android.com/android/platform/superproject/main/+/main:external/trusty/bootloader/ql-tipc/avb.c?q=trusty_write_lock_state`_

• rockchip android avb

• How To Unlock Bootloader Via Fastboot Method On Android

• fastboot.cpp