Build Buildroot firmware

This chapter introduces the compilation process of Buildroot firmware.

Build Linux-SDK

Precompile Configuration

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

   ./build.sh px30-lvds-buildroot.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
   # Buildroot config
   export RK_CFG_BUILDROOT=rockchip_px30_64                        # Buildroot configuration
   # Recovery config
   export RK_CFG_RECOVERY=rockchip_px30_recovery                   # recovery configuration
   # parameter for GPT table
   export RK_PARAMETER=parameter.txt                               # partition table
   # rootfs image path
   export RK_ROOTFS_IMG=buildroot/output/$RK_CFG_BUILDROOT/images/rootfs.$RK_ROOTFS_TYP    # filesystem path

Partial compilation

u-boot

   ./build.sh uboot

kernel

   ./build.sh kernel

recovery

   ./build.sh recovery

Buildroot filesystem

Compile the Buildroot filesystem and generate the compiled output
directory in "buildroot/output":

   ./build.sh buildroot

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

Automatic compilation

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

   ./build.sh

Partition table

parameter

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

path: "device/rockchip/px30/parameter.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),0x00020000@0x0003a000(oem),0x00c00000@0x0005a000(rootfs),-@0x00c5a000(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/px30-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
   misc            Image/misc.img
   boot            Image/boot.img
   recovery        Image/recovery.img
   rootfs          Image/rootfs.img
   oem             Image/oem.img
   userdata:grow   Image/userdata.img
   backup          RESERVED