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HOWTO.md

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HOW TO BUILD YOUR OWN FIRMWARE

  1. Make sure you have these packages preinstalled in your host: gawk wget git diffstat unzip texinfo gcc build-essential chrpath socat cpio python3 python3-pip python3-pexpect xz-utils debianutils iputils-ping python3-git python3-jinja2 libegl1-mesa libsdl1.2-dev pylint xterm python3-subunit mesa-common-dev zstd liblz4-tool gcc-arm-none-eabi
  2. If you plan to make a build for fwupd, make sure you also have these packages preinstalled in your host: php gcab
  3. Make sure you have at least 50Gb of available space
  4. Do at least a quick read of Yocto's Project Quick build doc: http://docs.yoctoproject.org/brief-yoctoprojectqs/index.html
  5. Clone this repository in your computer
  6. Go to the folder where you downloaded your copy and run ./init.sh
  • The init script should do the following things for you
    • Get the modem's bootloader source
    • Get the ARM toolchain to build the bootloader
    • Get Yocto build source
    • Get the specific layers and dependencies to build it all
    • Initialize yocto and add the bitbake layers to the env
  1. Run make, without arguments, to see what you can build:
  • everything: Build Bootloader, System and Recovery and pack it
  • aboot: build the LK bootloader
  • kernel: Build the kernel and place a bootable image in target/
  • root_fs: Build the kernel and rootfs without proprietary blobs and place both in target/
  • recovery_fs: will initialize Yocto’s build environment if it wasn’t already done before, and will build a bootable image that fits into the recovery partition to make debugging easier. I've left two scripts: recoverymount and rootfs mount that mount either of the rootfs partitions into /tmp so you can make modifications to the running image more easily
  • clean: Will remove build and temporary directories
  • target_extract: Will dump the contents of the generated image to target/dump so you can examine the contents of what you're pushing (you'll need python and python's CRC and LZO modules for it to work - check out UBIDUMP here)
  • target_clean: Removes the target directory contents
  • aboot_clean: Cleans the LK bootloader build folder along with the generated binary
  • yocto_clean: Removes Yocto's temporary folder
  • yocto_cleancache: Removes Yocto's sstate-cache in case you need to force a rebuild while working on recipes