2. Build Ubuntu firmware

This chapter introduces the compilation process of Ubuntu firmware.

2.1. Build Linux-SDK

2.1.1. Precompile Configuration

There are configuration files for different board in device/rockchip/px30/, select the configuration file:

./build.sh px30-lvds-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=evb-px30                              # u-boot configuration
# Kernel defconfig
export RK_KERNEL_DEFCONFIG=px30_linux_defconfig                 # kernel configuration
# Kernel dts
export RK_KERNEL_DTS=px30-firefly-lvds                          # dts file
# parameter for GPT table
export RK_PARAMETER=parameter-ubuntu.txt                        # partition table
# rootfs image path
export RK_ROOTFS_IMG=ubuntu_rootfs/px30_ubuntu_rootfs.img       # filesystem path

2.1.2. Partial compilation

  • u-boot

./build.sh uboot

  • kernel

./build.sh kernel

  • recovery

./build.sh recovery

2.1.3. Download Ubuntu filesystem

7z x ubuntu-arm64-rootfs.7z

  • Move filesystem to ubuntu_rootfs/

mkdir ubuntu_rootfs
mv ubuntu-arm64-rootfs.img ubuntu_rootfs/px30_ubuntu_rootfs.img

2.1.4. Pack the firmware

Update each part of the .img link to the directory rockdev/:

./mkfirmware.sh

Pack the firmware, the firmware will be saved to the directory rockdev/pack/.

./build.sh updateimg

2.1.5. Automatic compilation

The automatic compilation will perform the above compilation and packaging operations to generate complete firmware.

./build.sh

2.2. Partition table

2.2.1. parameter

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

path: device/rockchip/px30/parameter-ubuntu.txt

FIRMWARE_VER: 8.1
MACHINE_MODEL: PX30
MACHINE_ID: 007
MANUFACTURER: PX30
MAGIC: 0x5041524B
ATAG: 0x00200800
MACHINE: px30
CHECK_MASK: 0x80
PWR_HLD: 0,0,A,0,1
TYPE: GPT
CMDLINE: mtdparts=rk29xxnand:0x00002000@0x00004000(uboot),0x00002000@0x00006000(trust),0x00002000@0x00008000(misc),0x00010000@0x0000a000(boot),0x00010000@0x0001a000(recovery),0x00010000@0x0002a000(backup),0x00600000@0x0005a000(rootfs),-@0x0065a000(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.

2.2.2. 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/px30-ubuntu-package-file

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