Rock/U-Boot

English

Features

both Rockchip proprietary USB protocol and fastboot USB protocol are supported (Rockchip USB tools works)
format of partitions (images) are compatible to Rockchip proprietary bootloader (rkcrc, mkbootimg works)
(need more investigation...)

Build

git clone https://github.com/radxa/u-boot-rockchip.git
cd u-boot-rockchip
export ARCH=arm
export CROSS_COMPILE=arm-linux-gnueabihf-
make rk30xx

The binary we need for nand flash is RK3188Loader_miniall.bin and uboot.img.

Flash

refer flash image page

   sudo upgade_tool ul RK3188Loader_miniall.bin
   sudo upgrade_tool 0x2000 uboot.img
   sudo upgrade_tool rd

Booting log can be found at: http://paste.ubuntu.com/9623598/

Develop

Some important files and directories related to the Rockchip platform:

 * UserManual - documentation
 * include/configs/rk30xx.h - configuration file
 * tools/rk_tools

 * board/rockchip
    ├── common
    │   ├── armlinux
    │   ├── common
    │   │   ├── A8MMU
    │   │   ├── crc
    │   │   ├── emmc
    │   │   ├── fat
    │   │   ├── rc4
    │   │   ├── rockusb
    │   │   ├── serial_p9
    │   │   └── SPI
    │   └── platform
    │       ├── rk2928
    │       └── rk30
    └── rk30xx

 * arch/arm/cpu/armv7/rk30xx
 * arch/arm/include/asm/arch-rk30xx

Unbrick

If something goes wrong and your device doesn't boot anymore, read Unbrick Rock.

External links

http://androtab.info/rockchip/u-boot/ (working binaries)
https://github.com/linux-rockchip/u-boot-rockchip (some improvement)