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Uboot

This document details how to compile U-Boot on the Rockchip platform, including obtaining source code, configuration, toolchain setup, and using make.sh for compilation and packaging.

Preparation​

Source Code Preparation​

  • Get from official repository:

    git clone https://github.com/bit-brick/k1pro-u-boot.git

rkbin Preparation (U-Boot dependency)​

  • Get from official repository:

    git clone https://github.com/rockchip-linux/rkbin.git

Toolchain Preparation (Using GCC 10.3 64-bit as example)​

  • Download from ARM official website:

    wget https://developer.arm.com/-/media/Files/downloads/gnu/10.3-2021.07/binrel/gcc-arm-10.3-2021.07-x86_64-aarch64-none-linux-gnu.tar.xz

  • GCC versions below 10.3 can be obtained from Linaro.

  • Copy from the SDK provided by the board manufacturer:

    cp -rfp prebuilts/gcc/linux-x86/aarch64/gcc-arm-10.3-2021.07-x86_64-aarch64-none-linux-gnu/ .

Directory Preparation​

mv rkbin u-boot/
mkdir -p u-boot/toolchain
mv gcc-arm-10.3-2021.07-x86_64-aarch64-none-linux-gnu/ u-boot/toolchain/

make.sh Script​

make.sh is both a compilation script and a packaging/debugging tool. It can be used for disassembly and firmware packaging.

  • Help command:

    ./make.sh help

  • Compilation:

    ./make.sh board  # Build firmware based on board_defconfig
    ./make.sh env    # Generate fw_printenv tool

  • Output:

    Build artifacts are output in the current directory, including U-Boot/Trust/Loader images.

  • Package firmware:

    ./make.sh uboot  # Package U-Boot
    ./make.sh trust  # Package Trust
    ./make.sh loader # Package Loader

  • Disassembly:

    ./make.sh elf  # Disassemble ELF file, using -D parameter by default
    ./make.sh map  # Open u-boot.map
    ./make.sh sym  # Open u-boot.sym

Modifying make.sh​

  • Modify RKBIN_TOOLS to:

    RKBIN_TOOLS=rkbin/tools

  • If TOOLCHAIN_ARM64 exists, modify to:

    TOOLCHAIN_ARM64=toolchain/gcc-arm-10.3-2021.07-x86_64-aarch64-none-linux-gnu/bin

  • If CROSS_COMPILE_ARM64 exists, modify to:

    CROSS_COMPILE_ARM64=toolchain/gcc-arm-10.3-2021.07-x86_64-aarch64-none-linux-gnu/bin

Relationship between make.sh and rkbin​

  • rkbin: Used to store RK's non-open-source bins, scripts, and packaging tools. U-Boot will index related files from this repository during compilation to generate Loader, Trust, and U-Boot firmware.

  • rkbin/RKBOOT/xxx.ini files and rkbin/RKTRUST/xxx.ini files specify the firmware to be packaged.

  • In make.sh, the statement ${RKBIN}/RKBOOT/${RKCHIP_LOADER}MINIALL.ini specifies which ini file to use, where RKCHIP_LOADER is generally the platform name. For example, with RK3576, the ini file used would be rkbin/RKBOOT/RK3576MINIALL.ini.

Firmware Compilation​

  • Taking RK3576 as an example, execute:

    ./make.sh rk3576

    The actual configuration file used is ./configs/rv3575_defconfig.