2. Compile Ubuntu firmware¶
This chapter introduces the compilation process of Ubuntu firmware. It is recommended to develop under Ubuntu 18.04 system environment. If you use other system versions, you may need to adjust the compilation environment accordingly.
2.1. A brief introduction to Ubuntu firmware¶
2.2. Build Linux-SDK¶
2.2.1. Precompile Configuration¶
There are configuration files for different board in device/rockchip/rk356x/.
Return to SDK root directory to select the configuration file:
./build.sh aio-3568j-ubuntu.mk
The configuration file will be connected to device/rockchip/.BoardConfig.mk, check the file to verify whether the configuration is successful.
Configruation content:
# Target arch
export RK_ARCH=arm64 # 64-bit ARM
# Uboot defconfig
export RK_UBOOT_DEFCONFIG=firefly_rk3568 # u-boot configuration
# Kernel defconfig
export RK_KERNEL_DEFCONFIG=firefly_linux_defconfig # kernel configuration
# Kernel dts
export RK_KERNEL_DTS=firefly-rk3568-aioj # dts file
# parameter for GPT table
export RK_PARAMETER=parameter-ubuntu-fit.txt # partition table
# rootfs image path
export RK_ROOTFS_IMG=ubuntu_rootfs/rk356x_ubuntu_rootfs.img # filesystem path
2.2.2. Select Accessories to Compile¶
Under device/rockchip/rk356x/ , in addition to aio-3568j-ubuntu.mk, there are other configuration files that come with different accessories
The name of the configuration file indicates the screen and camera used. If the screen is not specified, the default HDMI display is used. If the camera is not specified, the default single camera is used
# For example:
xxxx-buildroot.mk # Use HDMI + single-camera
xxxx-2cam-buildroot.mk # Use HDMI + dual-camera
xxxx-mipi-buildroot.mk # Use mipi + single-camera
xxxx-mipi-2cam-buildroot.mk # Use mipi + dual-camera
Chose the configuration file you like, execute build.sh to make it effective:
# For example:
./build.sh xxxx-mipi-2cam-buildroot.mk
2.2.3. Download Ubuntu filesystem¶
Download: Ubuntu rootfs(64-bit)，put in SDK path
Unzip
7z x ubuntu-aarch64-rootfs.7z
Move filesystem to
ubuntu_rootfs/
mkdir ubuntu_rootfs
mv ubuntu-aarch64-rootfs.img ubuntu_rootfs/rk356x_ubuntu_rootfs.img
2.2.4. Automatic compilation¶
The automatic compilation will perform all compilation and packaging operations to generate RK firmware.
./build.sh
2.2.5. Partial compilation¶
u-boot
./build.sh uboot
kernel
Notice：Firefly kernel does not come with all kernel features, need extra kernel features please refer to Kernel
./build.sh kernel
Notice：Linux SDK v1.2.4a and later using extboot, please use ./build.sh extboot to build kernel
The output file is SDK/kernel/extboot.img, use it instead of boot.img
How to check SDK version:
The version format is vx.x.xx, eg: v1.2.4a
Firmware filename has SDK version(…_vx.x.xx_date.img)
Buildroot use
cat /etc/versionto get version(rk356x_linux_release_date_vx.x.xx.xml)Ubuntu use
ffgo versionto get(rk356x_linux_release_date_vx.x.xx.xml)In SDK check the link:
ls -l .repo/manifests/rk356x_linux_release.xmlIf you can’t get version by methods above, that means you are using old version, no support for extboot
Do not burn extboot.img into old version firmware!
Besides, extboot ubuntu support update kernel by deb package, please see Ubuntu Manual
recovery
./build.sh recovery
2.2.7. Pack the firmware¶
Pack the firmware, the firmware will be saved to the directory rockdev/pack/.
2.2.7.1. RK firmware¶
RK firmware is the firmware packaged in Rockchip’s proprietary format, and can be flashed to eMMC or SD card with the tools provided by Rockchip (Note: If there is no special instruction, the firmware mentioned on WIKI defaults to RK firmware) .
# Pack RK firmware
./build.sh updateimg
2.2.7.2. RAW firmware¶
RAW firmware is a kind of firmware that can be flashed to the storage device in a bit-by-bit copy mode, and is the original image of the storage device. Different from the RK firmware, currently it only supports flashing to SD card to boot with Etcher tool.
# Package RAW firmware
./build.sh rawimg
2.3. Partition table¶
2.3.1. parameter¶
The parameter.txt file contains the partition information of the firmware. Take parameter-ubuntu-fit.txt as an example:
path: device/rockchip/rk356x/parameter-ubuntu-fit.txt
FIRMWARE_VER: 1.0
MACHINE_MODEL: RK3568
MACHINE_ID: 007
MANUFACTURER: RK3568
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),0x00010000@0x00008000(boot),0x00010000@0x00018000(recovery),0x00010000@0x00028000(backup),0x00c00000@0x00038000(rootfs),-@0x00c38000(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.
2.3.2. 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/rk356x-ubuntu-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