Building Linux Kernel Print

 

This application note explains how to build Linux kernel images for the Emcraft STM32MP1 System-On-Module. Step through the following procedure:

  1. Download the Yocto toolchain from the Emcraft website.
  2. Install the toolchain to your development host. The toolchain can be installed to an arbitrary directory:

    3. $ sh ./meta-toolchain-qt5-openstlinux-weston-stm32mp1-som-x86_64-toolchain-2.4-snapshot.sh

  3. Activate the cross-build environment:

    4. $ source /opt/st/stm32mp1-som/2.4-snapshot/environment-setup-cortexa7hf-neon-vfpv4-openstlinux_weston-linux-gnueabi
    $  unset CCACHE_PATH

  4. Download the Emcraft STM32MP1 SOM add-on Yocto layer from the Emcraft website and unpack it to an arbitrary directory on your development host:

    5. $ mkdir build
    $ cd build
    $ tar xfj meta-emcraft-stm32mp1.tar.bz2

  5. Unpack the Linux tarball:

    6. $ tar xfz meta-emcraft/recipes-kernel/linux/linux-stm32mp1/linux-emcraft-4.14-stm32mp1.tar.gz
    $ cd linux

  6. Copy the Device Source Tree file for the STM32MP1 SOM into the kernel tree:

    7. $ cp ../meta-emcraft/recipes-kernel/linux/linux-stm32mp1/stm32mp1-som.dts arch/arm/boot/dts/

  7. Configure the kernel tree build:

    8. $ cp ../meta-emcraft/recipes-kernel/linux/linux-stm32mp/stm32mp1-som.kernel arch/arm/configs/stm32mp1-som_defconfig
    $ make stm32mp1-som_defconfig

  8. Build the kernel image:

    9. $ make -s -j10 uImage LOADADDR=0xC2000040
    ...
    $ ls -l arch/arm/boot/uImage

  9. Build the DTB:

    10. $ make stm32mp1-som.dtb
    $ ls -l arch/arm/boot/dts/stm32mp1-som.dtb

  10. Build kernel modules:

    11. $ make modules