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    ROCK Pi 4 >  Development >  U-Boot

Build U-Boot and run it on ROCK Pi 4

This guide describes how to build U-Boot and run it on ROCK Pi 4. U-Boot images could be installed into eMMC, Micro SD card and SPI Flash, etc.

Hardware required

• ROCK Pi 4 mainboard
• A eMMC module or a MicroSD card or SPI Flash soldered on board
• Power adapter
• USB Male A to Male A cable(important).
• A PC/laptop running Linux

Build U-Boot

Step 1: Get the source code

You need Git to get multiple git repositories to build the image.

Install Git if you don't have it.

   sudo apt-get update && sudo apt-get install -y git

Clone the source code

   git clone --recursive https://github.com/radxa/rockchip-bsp.git

You will get

   build  kernel  README.md  rkbin  rootfs  u-boot

Directories usage introductions:

• build:
  • Some script files and configuration files for building u-boot, kernel and rootfs.
• kernel:
  • kernel source code, current version is 4.4
• rkbin:
  • Prebuilt Rockchip binaries, include first stage loader and ATF(Arm Trustzone Firmware).
• rootfs:
  • Bootstrap a Debian based rootfs, support architechture armhf and arm64, support Debian Jessie and Stretch.
• u-boot:
  • u-boot as the second stage bootloader

There are two branches for ROCK Pi 4 U-Boot. One is stable-4.4-rockpi4 and the other is rk3399-pie-gms-express-baseline.
Specially the branch rk3399-pie-gms-express-baseline supports SPI NVME Boot.

Step 2: Install tool-chain and other build tools

 sudo apt-get install -y gcc-aarch64-linux-gnu device-tree-compiler libncurses5 libncurses5-dev
 sudo apt-get install -y bc python dosfstools flex build-essential libssl-dev mtools

Step 3: Build U-boot

• If you use the ROCK Pi 4A

 ./build/mk-uboot.sh rockpi4a

• If you use the ROCK Pi 4B

 ./build/mk-uboot.sh rockpi4b

• If you use the ROCK Pi 4C

 ./build/mk-uboot.sh rockpi4c

And then you can get the directory, out, of all the generated images.

U-boot Usage

• PXE boot
• SPI NVME boot

FAQs

1. USB-C has been seen as not working, an adaptor for USB-C to USB-A has worked. See discussion.

Troubleshooting

• Post your issue at the forum: https://forum.radxa.com/c/dev.