Fastboot
Contents
Introduction
Fastboot is a protocol that can be used to re-flash partitions on your device (update the flash file system in your devices). It is this small tool that comes with the Android SDK (Software Developer Kit), which is an alternative to the Recovery Mode for doing installations and updates. It first comes with Android. Google have submit the fastboot code to mainline U-boot. So we can use this protocol to flash partition on your device. There are three way to enter fastboot mode
Fastboot command
Rockchip use 0x2207 as its USB vendor ID. This VID is not in Google's original fastboot code. So every fastboot command have to use "-i" parameter to specify vid to fastboot.
To list all the Rockchip devices attached to your USB port in fastboot mode.
<code>$ sudo fastboot -i 0x2207 devices 0123456789AB fastboot</code>
To flash loader
<code>$ sudo fastboot -i 0x2207 flash loader "path to your loader"</code>
To flash android boot image
<code>$ sudo fastboot -i 0x2207 flash boot_a "path to your boot image" 0123456789AB fastboot</code>
To flash android system image
<code>$ sudo fastboot -i 0x2207 flash system_a "path to your system image" 0123456789AB fastboot</code>
To get version:
fastboot getvar version
To get version:
fastboot getvar version-bootloader
To get unlocked:
fastboot getvar unlocked
To get locked:
fastboot getvar secure
To get product information:
fastboot getvar product
To get serialno:
fastboot getvar serialno
To get partition type:
fastboot getvar partition-type:<partition_name>
To get partition size:
fastboot getvar partition-size:<partition_name>
To get partition offset:
fastboot getvar partition-offset:<partition_name>
Download the Image
To flash image:
fastboot flash <partition_name> <filename>
(For example：fastboot flash system system.img）
When download the parameter or loader，you need assign the partition name as "parameter" or "loader"
To update firmware:
fastboot update <filename>
（The firmware package was generated from android source code make updatepackage）
Reboot
To recovery:
fastboot oem recovery
To recovery and restore:
fastboot oem recovery:wipe_data
To Reboot:
fastboot reboot
To reboot and enter rockusb loader mode
fastboot reboot-bootloader
To continue:
fastboot continue
Lock and Unlock the Device
To unlock:
fastboot oem unlock
To confirm unlock（input it in 5 minutes after inputing fastboot oem unlock command）:
fastboot oem unlock_accep
To lock the device:
fastboot oem lock
Special Command
To boot from specifc firmware templately:
fastboot boot <kernel> [ <ramdisk> ]
（Kernel supports Image/zImage，and you should keep dtb in the last part of kernel，or resource partition）
To generate a log file:
fastboot oem log
To execute u-Boot command:
fastboot oem ucmd <UBOOT cmds>
Fastboot Unlock
fastboot锁住状态下，不允许烧写及执行oem命令，初始状态为锁住。
解锁流程大致如下：
1、执行fastboot oem unlock
2、5秒内继续执行fastboot oem unlock_accept
3、机器会重启进入recovery恢复出厂设置
4、再次进入fastboot，则fastboot getvar unlocked应该返回"yes"（设备已解锁）
如果设备进入fastboot状态后，fastboot命令提示未发现设备，则需要在命令中加入-i参数指定设备vid，例如fastboot -i 0x2207 getvar unlocked
