Buildroot

Preparation

We need one Ubuntu 20.04/22.04 x86_64 PC.

We can also use virtual machine

• ubuntu-22.04.5-live-server-amd64 virtual machine with 120G disk used.

Install build dependencies

sudo apt update
sudo apt install python2 git rsync gcc g++ make device-tree-compiler bc flex bison lz4 libssl-dev libgmp-dev libmpc-dev expect expect-dev file unzip bzip2 fakeroot bsdmainutils
sudo ln -s /bin/python2 /bin/python

Get rockchip original SDK

• Mega: https://mega.nz/file/JugCGDDC#NNL5_qRDRr-NL6TS3F1FSzkoXFwRCwDTNTW3KAiTtpI
• BaiduPan: https://pan.baidu.com/s/12rQmYaRMKwgz8cOBNjc4yQ?pwd=35mj

Extract SDK

On Ubuntu PC we use the following commands to extract the SDK.

tar xvf rk356x_linux5.10_rkr8_sdk.repo.tar
.repo/repo/repo  sync -l

Add board Zero 3E support

Note: Do not compile as root user, as this may cause permission issues. It is recommended to build as a regular user.

Use Radxa repository, rockchip.

cd device/rockchip
git remote add radxa https://github.com/radxa/device-rockchip.git
git fetch radxa
git switch -c rk3566_rk3568-linux-5.10 radxa/rk3566_rk3568-linux-5.10

Use Radxa repository, kernel.

cd kernel
git remote add radxa https://github.com/radxa/kernel.git
git fetch radxa
git switch -c linux-5.10-gen-rkr8-buildroot radxa/linux-5.10-gen-rkr8-buildroot

Build SDK

Navigate to the top-level directory of the SDK, run command.

./build.sh

And select defconfig rockchip_rk3566_radxa_zero_3e_defconfig. The target images will be stored on rockdev directory.

Use the SDDiskTool to flash the image into the SDCard

SDDiskTool is Rockchip's official SD card flashing tool.

• Download SDDiskTool

  • SDDiskTool currently only has a Windows version, so please use it on a Windows computer.

  • Download link:SDDiskTool_en_v1.74.zip

• Flash SD card

  • We need to flash the corresponding complete image in RK format.

  • Complete image in RK format refers to The update.img image compiled using a series of Linux SDKs released by Rockchip based on Buildroot

  • Open the executable file SD_Firmware_Tool.exe of SDDiskTool and insert the SD card.

    warning

    When multiple storage devices are connected, please ensure you select the correct SD card to flash, otherwise other storage devices may be overwritten.

  • Select the SD card to flash from the removable disk devices, choose SD Boot as the function mode, ensure that the firmware upgrade is a complete image in RK format, and finally click Create to flash the image.

    

  • Please be patient during the flashing process. The image contains many partitions, and if the image is large, the flashing time will be longer.

If you encounter problems clearing the MBR while burning, you need to change the SD card disk label type from dos to gpt.

Windows

• Delete all partitions and convert to gpt using command prompt under windows

  • Press Win + X and select Windows Terminal (Administrator) or Command Prompt (Administrator).

  • Enter the following command and press Enter:

Host-Windows$

diskpart

• Then, enter the following command to list all disks:

Host-Windows$

list disk

• Locate your SD card (assuming it is disk 3) and enter:

Host-Windows$

select disk 3

• (If your SD card has a different disk number, change 3 to the correct number accordingly.)

• Clear all partitions on the disk:

Host-Windows$

clean

• (This deletes all partitions and data on the SD card.)

• Converts a disk to GPT format:

Host-Windows$

convert gpt

• Type exit to exit the diskpart utility.

Linux

• Use the fdisk command to change the label format to gpt on Linux.

  • Find your SD card (assuming it's /dev/sdb) and enter:

Host-Linux$

sudo fdisk /dev/sdb

• Type p and the label format and partition of the current disk will be displayed.

• Then type g to convert the disk to gpt format

• Then just type wq to save and exit.