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Linux Kernel (2018 March MDK Release)

Critical Link Kernel Repository

Critical Link recommendings using the mityarm-linux-v4.4 branch on our git server: git://support.criticallink.com/home/git/linux-mityarm-335x.git (Gitweb)

Configuring the Kernel Build Environment

  • Setup the MDK environment (Note: Your SDK path may differ):
    source /opt/criticallink/mitysom-335x_2018-03-16/environment-setup-cortexa8hf-neon-criticallink-linux-gnueabi
    

Building the Kernel

  • Clone the repository from Critical Link:
    git clone git://support.criticallink.com/home/git/linux-mityarm-335x.git
    cd linux-mityarm-335x
    git checkout -b linux4.4_rc d14cb2297ba452198c1b19b6e6984b4640aba1a9
    

    Note: Commit: d14cb2297ba452198c1b19b6e6984b4640aba1a9 is the commit for the March MDK release. Checking out the origin/linux4.4_rc branch will check out a newer commit not covered by this page.
    Note: You may need to run
    git fetch
    

    if the branch wasn't cloned.
  • Configure the build for the Development Kit Baseboard
    make mitysom-335x-devkit_defconfig
    
  • Optional: Customize the kernel
    make menuconfig
    
  • Build the kernel image
    make zImage
    

    For a faster build, add -j<# threads> to build with multiple threads. Optimally, use as many threads as the building machine has cores.
  • Make the kernel modules
    make modules
    make INSTALL_MOD_PATH=../rootfs/ modules_install
    

    This will build the selected kernel modules and then install them under ../rootfs/. You can change this path to change where the modules will install. For example, you may have the build install directly to an SD card. (Note: Make sure you include the INSTALL_MOD_PATH variable and do not run as root. The kernel Makefile will attempt to install these modules into your machine's root filesystem. You probably do NOT want this!)
  • Make device tree blobs (DTB)
    make dtbs
    

    You will find the compiled DTBs in arch/arm/boot/dts.
    Note: These will be in the same folder as the source files. Make sure to use the .dtb file and not the .dts or .dtsi.

A number of device trees for the devkit are compiled. Use the device tree that matches your SOM variant.

am335x-mitysom-<size of NAND>-NOR.dtb  - SOMs with NOR
am335x-mitysom-<size of NAND>.dtb      - SOMs without NOR
am335x-mitysom.dtb                     - SOM with no NOR or NAND

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