Compile Linux Firmware (kernel-5.10)

Download Firefly_Linux_SDK

First prepare an empty folder to place SDK, better under home, here we use ~/proj as example.

Attention:

1. SDK uses cross-compile, so download SDK to your X86_64 PC, do not download SDK to arm64 board.

2. Build environment needs to be Ubuntu18.04 (real PC or docker container), other versions may cause build failure.

3. Do not put SDK under shared directory of VM or non-English path.

4. Please get/build SDK as a normal user, root privilege are neither allowed nor required (except installing sth. with apt)

Install Tools

sudo apt update
sudo apt install -y repo git python

Init Code Repository

Method One

Download via repo, you can choose to get full SDK or BSP:

mkdir ~/proj/rk3588_sdk/
cd ~/proj/rk3588_sdk/

## Full SDK
repo init --no-clone-bundle --repo-url https://github.com/Firefly-rk-linux-utils/git-repo.git --no-repo-verify -u https://github.com/Firefly-rk-linux/manifests.git -b master -m rk3588_linux_release.xml

## BSP (Only include some basic repositories and compile tools(Only for ubuntu & debian))
## BSP includes device/rockchip, docs, kernel, u-boot, rkbin, tools and cross-compile toolchian
repo init --no-clone-bundle --repo-url https://github.com/Firefly-rk-linux-utils/git-repo.git --no-repo-verify -u https://github.com/Firefly-rk-linux/manifests.git -b master -m rk3588_linux_bsp_release.xml

Method Two

Download Firefly_Linux_SDK sub-volume compressed package: Linux SDK, follow the README document:

└── rk3588_linux_release_xxx
    ├── linux_sdk_tar
    │   ├── rk3588_linux_release_xxx.sdk.split00
    │   ├── rk3588_linux_release_xxx.sdk.split01
    │   ├── rk3588_linux_release_xxx.sdk.split02
    │   ├── rk3588_linux_release_xxx.sdk.split03
    ├── md5sum.txt
    ├── README_EN.txt
    ├── README_ZH.txt
    └── sdk_tools.sh

Sync Code

Execute the following command to synchronize the code:

# Enter the SDK root directory
cd ~/proj/rk3588_sdk

# Sync
.repo/repo/repo sync -c --no-tags
.repo/repo/repo start firefly --all

You can use the following command to update the SDK later:

.repo/repo/repo sync -c --no-tags

Linux SDK Configuration introduction

Introduction to configuration files

In the device/rockchip/rk3588/ directory, there are configuration files (xxxx.mk) for different board types, which are used to manage the compilation configuration of each project of the SDK. The relevant configuration introduction:

# Target arch
export RK_ARCH=arm64
# Uboot defconfig
export RK_UBOOT_DEFCONFIG=xxxx_defconfig
# Kernel defconfig
export RK_KERNEL_DEFCONFIG=xxxx_defconfig
# Kernel defconfig fragment
export RK_KERNEL_DEFCONFIG_FRAGMENT=xxxx.config
# Kernel dts
export RK_KERNEL_DTS=roc-rk3588-rt.dts
# parameter for GPT table
export RK_PARAMETER=parameter-xxxx.txt
# rootfs image path
export RK_ROOTFS_IMG=ubuntu_rootfs/rootfs.img

Partition table

parameter

The parameter.txt file contains the partition information of the firmware. Take parameter-ubuntu-fit.txt as an example:

path: device/rockchip/rk3588/parameter-ubuntu-fit.txt

FIRMWARE_VER: 1.0
MACHINE_MODEL: RK3588
MACHINE_ID: 007
MANUFACTURER: RK3588
MAGIC: 0x5041524B
ATAG: 0x00200800
MACHINE: 0xffffffff
CHECK_MASK: 0x80
PWR_HLD: 0,0,A,0,1
TYPE: GPT
CMDLINE: mtdparts=rk29xxnand:0x00002000@0x00004000(uboot),0x00002000@0x00006000(misc),0x00020000@0x00008000(boot:bootable),0x00040000@0x00028000(recovery),0x00010000@0x00068000(backup),0x00c00000@0x00078000(rootfs),0x00040000@0x00c78000(oem),-@0x00cb8000(userdata:grow)
uuid:rootfs=614e0000-0000-4b53-8000-1d28000054a9

The CMDLINE attribute is where we are concerned. Take uboot as an example. In 0x00002000@0x00004000(uboot), 0x00004000 is the starting position of the uboot partition, 0x00002000 is the size of the partition, and so on.

package-file

The package-file is used to determine the required partition image and image path when packaging the firmware, and it needs to be consistent with the parameter.txt.

path: tools/linux/Linux_Pack_Firmware/rockdev/rk3588-package-file

# NAME          Relative path
#
#HWDEF          HWDEF
package-file    package-file
bootloader      Image/MiniLoaderAll.bin
parameter       Image/parameter.txt
uboot           Image/uboot.img
misc            Image/misc.img
boot            Image/boot.img
recovery        Image/recovery.img
rootfs          Image/rootfs.img
userdata        RESERVED
backup          RESERVED