Rock/U-Boot

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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...)

For NAND flash

Build

git clone -b u-boot-rk3188 https://github.com/radxa/u-boot-rockchip.git
cd u-boot-rockchip
export ARCH=arm
export CROSS_COMPILE=arm-eabi-         # recommend to use the rockchip official toolchain, refer  kernel building to install it
make rk30xx

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

Flash

refer flash image page

use the new u-boot to erase the old loader

   sudo upgrade_tool ef RK3188Loader_miniall.bin

flash new loader

   sudo upgrade_tool ul RK3188Loader_miniall.bin

format NAND (first time only)

   sudo upgrade_tool lf

flash U-Boot

   sudo upgrade_tool wl 0x2000 uboot.img
   sudo upgrade_tool rd

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

For SD card

Build

git clone -b u-boot-rk3188 https://github.com/radxa/u-boot-rockchip.git
cd u-boot-rockchip
export ARCH=arm
export CROSS_COMPILE=arm-eabi-         # recommend to use the rockchip official toolchain, refer  kernel building to install it
make rk30xx
./pack-sd.sh

The binary we need for sdcard is u-boot-sd.img.

Flash

sudo dd if=u-boot-sd.img of=/dev/sdx seek=64

Insert the uSD card to rock pro, it will boot from u-boot on uSD card.

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)