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1 How to compile custom kernel and u-boot

1.1 Kernel and u-boot versions for each OS

Operating System Kernel Version U-boot version Cross-compiler Partition type Build toolset Kernel code branch Kernel configuration U-boot code branch u-boot configuration
buildroot linux v5.10.y u-boot
v2017.09 		11.3-aarch64 GPT sd-fuse nanopi5-v5.10.y_opt nanopi5_linux_defconfig nanopi5-v2017.09 rk3568_defconfig
friendlycore-focal-arm64
debian-bullseye-core-arm64
debian-bullseye-desktop-arm64
debian-bullseye-minimal-arm64
debian-buster-desktop-arm64
friendlywrt21 nanopi5_linux_defconfig
friendlywrt.config
friendlywrt21-docker
friendlywrt22
friendlywrt22-docker 
export PATH=/opt/FriendlyARM/toolchain/11.3-aarch64/bin/:$PATH
  • The sd-fuse build toolset can be used to quickly compile the kernel and u-boot, as well as repackaging SD card image and SD-to-eMMC image.

1.2 Compile kernel linux-v5.10.y

Download the source code and compile as follows: 

git clone https://github.com/friendlyarm/kernel-rockchip --single-branch --depth 1 -b nanopi5-v5.10.y_opt kernel-rockchip
cd kernel-rockchip
export PATH=/opt/FriendlyARM/toolchain/11.3-aarch64/bin/:$PATH
touch .scmversion
# Configuring the Kernel
# Option1: Load Linux system configuration
make CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 nanopi5_linux_defconfig
# Option2: Load FriendlyWrt system configuration
# make CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 nanopi5_linux_defconfig friendlywrt.config
# Launch configuration interface
# make CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 menuconfig
# Compiling Kernel
make CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 nanopi5-images -j$(nproc)
# Compiling the driver modules
mkdir -p out-modules && rm -rf out-modules/*
make CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 INSTALL_MOD_PATH="$PWD/out-modules" modules -j$(nproc)
make CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 INSTALL_MOD_PATH="$PWD/out-modules" modules_install
KERNEL_VER=$(make CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 kernelrelease)
[ ! -f "$PWD/out-modules/lib/modules/${KERNEL_VER}/modules.dep" ] && depmod -b $PWD/out-modules -E Module.symvers -F System.map -w ${KERNEL_VER}
(cd $PWD/out-modules && find . -name \*.ko | xargs aarch64-linux-strip --strip-unneeded)

You will get the following file:

kernel.img resource.img boot.img This img is deprecated The kernel modules are located in the out-modules directory

Installing the kernel:
Please click on #Download u-boot and the kernel to the target board

1.3 Compile u-boot v2017.09

Download the source code and compile as follows: 

git clone https://github.com/friendlyarm/rkbin --single-branch --depth 1 -b nanopi5
git clone https://github.com/friendlyarm/uboot-rockchip --single-branch --depth 1 -b nanopi5-v2017.09
export PATH=/opt/FriendlyARM/toolchain/11.3-aarch64/bin/:$PATH
cd uboot-rockchip/
./make.sh nanopi5

After the compilation, the following files will be generated:

uboot.img rk356x_spl_loader_v1.15.112.bin (Before packaging, you need to rename it to MiniLoaderAll.bin)

Installing the u-boot:
Please click on #Download u-boot and the kernel to the target board

1.4 Download u-boot and the kernel to the target board

1.4.1 Download to the installed system

Since the RK3568's OS uses GPT partitions by default, you can use the dd command to write the image file to the partition, the device nodes for SD card and eMMC are shown below:

  • The SD/TF Card device node: /dev/mmcblk0
  • The eMMC device node: /dev/mmcblk2

The following is an example of how to update the kernel to eMMC:
Use the 'parted' command to view the partition layout: 

parted /dev/mmcblk2 print

You should get output similar to the following: 

Model: MMC A3A551 (sd/mmc)
Disk /dev/mmcblk2: 31.0GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
 
Number  Start   End     Size    File system  Name      Flags
 1      8389kB  12.6MB  4194kB               uboot
 2      12.6MB  16.8MB  4194kB               misc
 3      16.8MB  21.0MB  4194kB               dtbo
 4      21.0MB  37.7MB  16.8MB               resource
 5      37.7MB  79.7MB  41.9MB               kernel
 6      79.7MB  113MB   33.6MB               boot
 7      113MB   147MB   33.6MB               recovery
 8      147MB   31.0GB  30.9GB  ext4         rootfs

as shown above, the resource partition is located at 4 and the kernel partition is located at 5. Use the dd command to write the resource.img and kernel.img files to these partitions, the commands are as follows: 

dd if=resource.img of=/dev/mmcblk2p4 bs=1M
dd if=kernel.img of=/dev/mmcblk2p5 bs=1M

If you want to update u-boot: 

dd if=boot.img of=/dev/mmcblk2p1 bs=1M

To update new driver modules, copy the newly compiled driver modules to the appropriate directory under /lib/modules.

1.4.2 How to create a new OS image file

To create a new OS image file, you need to use the "sd-fuse" packaging tool.

"sd-fuse" is a collection of scripts that can be used to create bootable SD card images for FriendlyElec boards. Its main features include:

  • Creation of root filesystem images from a directory
  • Building of bootable SD card images
  • Simple compilation of kernel, U-Boot, and third-party drivers

Please click on the following link to find out more:

Kernel version Build toolset
linux v5.10.y
sd-fuse_rk3568
1.4.3 USB flashing
1.4.3.1 Linux

To flash U-Boot and kernel using the "upgrade_tool" tool, please use the following command: 

sudo upgrade_tool ul MiniLoaderAll.bin
sudo upgrade_tool di -p parameter.txt
sudo upgrade_tool di uboot uboot.img
sudo upgrade_tool di resource resource.img
sudo upgrade_tool di kernel kernel.img
sudo upgrade_tool RD

Note: "upgrade_tool" is a command-line tool provided by Rockchip for Linux operating systems (Linux_Upgrade_Tool).

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