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README.md

buildbrain

This repository includes:

  • linux-brain, u-boot-brain, nkbin_maker and boot4u as submodules
  • Useful build targets in Makefile
  • r3build.toml to watch changes that occur in submodules

Confirmed environments

  • Debian 10 (buster) amd64
  • Debian 11 (bullseye) amd64

Getting Started

  1. Install dependencies.

    $ sudo apt install build-essential bison flex libncurses5-dev gcc-arm-linux-gnueabi gcc-arm-linux-gnueabihf libssl-dev bc lzop qemu-user-static debootstrap kpartx libyaml-dev python3-pyelftools

  2. Clone this repository with recursive clone enabled.

    $ git clone --recursive git@github.com:brain-hackers/buildbrain.git
    • If you've cloned it without --recursive, run following command:
    $ git submodule update --init --recursive

  3. Install uuu.

    • Follow the instruction and build uuu executable.
    • Put uuu where the PATH executable points to.

Build U-Boot

  1. Run make udefconfig-sh* to generate .config.

    • For Sx1: make udefconfig-sh1
    • For Sx6: make udefconfig-sh6
    • For x1: make udefconfig-h1

  2. Run make ubuild to build whole repository and generate u-boot.sb or u-boot.bin.

    • i.MX283 loads a packed U-Boot executable called u-boot.sb.

Inject U-Boot into i.MX283 in recovery mode

  1. Follow Build U-Boot procedure to make U-Boot binary.

  2. Run make uuu

Build and make NK.bin

  1. Follow Build U-Boot procedure to make U-Boot binary.

  2. Run make nkbin-maker.

  3. To make nk.bin, run make nk.bin.

    • nkbin_maker packs u-boot.bin into nk.bin.

Build and deploy boot4u

  1. Run make boot4u

  2. Create index.din and copy AppMain.bin

    • mkdir /path/to/your/sd/1st/partition/App/boot4u
    • touch /path/to/your/sd/1st/partition/App/boot4u/index.din
    • cp boot4u/AppMain.bin /path/to/your/sd/1st/partition/App/boot4u/

Build Linux

  1. Run make ldefconfig to generate .config.

  2. Run make lbuild to generate zImage.

  3. Confirm that linux-brain/arch/arm/boot/zImage exists.

Bootstrap Debian 11 (bullseye)

  1. Run make ldefconfig lbuild.

  2. Run APT cache in background (mandatory): make aptcache.

  3. Run make brainux.

  4. Run make image/sd.img

  5. Confirm that image/sd.img is built and burn it to an SD card.

Known issues

If you using gcc 10 for host compiler, make ubuild may fail.
To complete build, open /u-boot-brain/scripts/dtc/dtc-lexer.lex.c or /u-boot-brain/scripts/dtc/dtc-parser.tab.c then comment out YYLTYPE yylloc;

Watch changes in submodules & auto-build

  1. Run make setup-dev to prepare a Python venv to watch code changes. Namely;

    • Python 3 venv in env
    • r3build command in the env

  2. Run r3build. It'll detect the changes you make and builds the corresponding executable automatically.

What's r3build?

r3build is a smart file watcher that aims to provide hot-reloading feature like Web frontend development.