Building U-Boot Print

 

This application note explains how to build the U-Boot image for booting the Emcraft i.MX 8M System-On-Module from SD card. 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 ./fsl-imx-fb-glibc-x86_64-meta-toolchain-qt5-aarch64-toolchain-4.9.51-mx8-beta.sh

  3. Activate the cross-build environment:

    4. $ source /opt/fsl-imx-fb/4.9.51-mx8-beta/environment-setup-aarch64-poky-linux
    $ unset CCACHE_PATH

  4. Download the Emcraft i.MX 8M 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-imx8m.tar.bz2

  5. Unpack the U-Boot and imx-mkimage tarballs:

    6. $ tar xfz meta-emcraft/recipes-bsp/u-boot/files/\
    u-boot-emcraft-2017.03-mx8.tar.gz
    $ tar xfz meta-emcraft/recipes-bsp/imx-mkimage/files/\
    imx-mkimage-emcraft.tar.gz

  6. Clean up the build directory:

    7. $ cd u-boot/
    $ make distclean

  7. Choose a proper build configuration (available configurations differ for 1GB, 2GB, and 3GB i.MX 8M SOM variants: imx8m_lpddr4_som_config, imx8m_lpddr4_2gb_som_config, imx8m_lpddr4_3gb_som_config):

    8. $ make imx8m_lpddr4_som_config

  8. Build the i.MX 8M SOM U-Boot image:

    9. $ make
    $ cd ../imx-mkimage
    $ CFLAGS= make SOC=iMX8M clean
    $ cp ../u-boot/u-boot-nodtb.bin iMX8M/
    $ cp ../u-boot/arch/arm/dts/emcraft-imx8m-som.dtb iMX8M/fsl-imx8mq-evk.dtb
    $ cp ../u-boot/spl/u-boot-spl.bin iMX8M/
    $ cp ../u-boot/u-boot.bin iMX8M/
    $ CFLAGS= make SOC=iMX8M flash_evk

  9. The U-Boot image ready for installation to the i.MX 8M SOM is here:

    10. $ ls -l iMX8M/flash.bin