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.

$ sudo fastboot -i 0x2207 devices 0123456789AB fastboot

To flash loader

$ sudo fastboot -i 0x2207 flash loader "path to your loader"

To flash android boot image

$ sudo fastboot -i 0x2207 flash boot_a "path to your boot image" 0123456789AB fastboot

To flash android system image

$ sudo fastboot -i 0x2207 flash system_a "path to your system image" 0123456789AB fastboot

fastboot getvar version

fastboot getvar version-bootloader

To get unlocked:

fastboot getvar unlocked

fastboot getvar secure

To get product information:

fastboot getvar product

To get serialno:

fastboot getvar serialno

To get partition type:

To get partition size:

To get partition offset:

Download the Image

(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:

（The firmware package was generated from android source code make updatepackage ）

Reboot

fastboot oem recovery

To recovery and restore:

fastboot oem recovery:wipe_data

fastboot reboot

To reboot and enter into rockusb loader mode

fastboot reboot-bootloader

fastboot continue

Lock and Unlock the Device

fastboot oem unlock

To confirm unlock（input it in 5 minutes after typing 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 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:

Unlock your Device via Fastboot

Initially,it is not allow you perform flash or oem command with locked fastboot.

1、Executing fastboot oem unlock

2、Then executing fastboot oem unlock_accept in 5 seconds,

3、You device will reboot and recovery

4、Now push your device into fastboot mode again and fastboot getvar unlocked will return to "yes"

（Congraduations you have unlock your device finished!）

What if the device have entered into fastboot mode with indicates that NOT found your device , you need put -i into your command in order to assign device ID.

For example：fastboot -i 0x2207 getvar unlocked