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U-boot Develop

BSP is a set of tools provided by Radxa to quickly build U-Boot Kernel. It is very convenient to use bsp to build your own U-Boot and Kernel.
The following will show you how to use bsp to build the U-Boot of Radxa CM5 IO.

bsp Environment configuration​

Build U-Boot​

After completing the bsp environment configuration, you need to compile U-Boot once before pulling the relevant code from the repository.
you can execute . /bsp u-boot rknext radxa-cm5-io to build U-Boot, the path to the U-Boot source code is located in the bsp directory under .src/u-boot.

cd bsp
mkdir output
cd output
../bsp --no-prepare-source u-boot rnkext radxa-cm5-io

Parameter Description:
--no-prepare-source

#Compile with local changes, if you don't add this parameter it will sync the latest code from the Radxa U-Boot repository and overwrite the local changes.

For more bsp parameter usage instructions, you can execute ./bsp to view.

After compilation, many deb packages will be generated in the bsp/output directory, you just need to install the following deb packages.

u-boot-rknext_2017.09-1_arm64.deb

Copy the above two deb packages to the board and install them with the dpkg command to complete the U-Boot installation.

sudo dpkg -i u-boot-rknext_2017.09-1_arm64.deb

U-Boot needs to be flashed onto the boot media after the installation is complete.

cd /usr/lib/u-boot/radxa-cm5-io/
sudo ./setup.sh update_bootloader /dev/mmcblk1   #/dev/mmcblk1 is the boot media you are currently using, you need to select it according to the actual device you are using
sudo reboot

After reboot, you can observe the U-Boot boot log to see if U-Boot has been successfully updated.