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Configuring the build

Setup Yocto environment

  • WorkDir:
mkdir compulab-nxp-bsp && cd compulab-nxp-bsp
  • Set a CompuLab machine:
Machine Command Line
ucm-imx8m-plus export MACHINE=ucm-imx8m-plus

Initialize repo manifests

  • NXP
repo init -u https://github.com/nxp-imx/imx-manifest -b imx-linux-kirkstone -m imx-5.15.32-2.0.0.xml
  • CompuLab
mkdir -p .repo/local_manifests
wget --directory-prefix .repo/local_manifests https://raw.githubusercontent.com/compulab-yokneam/meta-bsp-imx8mp/ucm-imx8m-plus-r2.0/scripts/meta-bsp-imx8mp.xml
  • Sync Them all
repo sync

Get the product DRAM configuration

The device DRAM configuration is at the device label and is also stored in the device EEPROM.

  • Getting memory configuration from the label: Use the 'D' option code from the device label.

  • Getting memory configuration from the EEPROM:

Environment Command Output Description
U-Boot i2c dev 1; i2c md 0x50 0x90 0x10 0090: 43 31 38 30 30 51 4d 2d 44 34 2d 4e 33 32 2d 00 C1800QM-D4-N32-. D4 = 4G
Kernel i2cdump -f -y 1 0x50 2>/dev/null | awk '/^90:/' 0: 43 31 38 30 30 51 4d 2d 44 34 2d 4e 33 32 2d 00 C1800QM-D4-N32-.
  • Mapping of product DRAM configuration to DRAM_CONF:
Product DRAM Option DRAM_CONF
D1,D8 d1d8
D2,D4 d2d4

Setup build environment

  • Initialize the build environment:
source compulab-setup-env -b build-${MACHINE}

  • Enable the required dram setting's subset:

    • For d2d4 dram setting's subset:
    sed -i '$ a DRAM_CONF = "d2d4"' ${BUILDDIR}/conf/local.conf
    • For d1d8 dram setting's subset:
    sed -i '/DRAM_CONF/d' ${BUILDDIR}/conf/local.conf

Building full rootfs image:

Build Target Build command binary file location
full rootfs image bitbake -k imx-image-full ${BUILDDIR}/tmp/deploy/images/${MACHINE}/imx-image-full-${MACHINE}.wic.bz2

Deployment

Create a live SD card

  • Goto the ${BUILDDIR}/tmp/deploy/images/${MACHINE} directory:
cd ${BUILDDIR}/tmp/deploy/images/${MACHINE}
  • Deploy the image:
sudo bmaptool copy imx-image-full-${MACHINE}.wic.bz2 --bmap imx-image-full-${MACHINE}.wic.bmap /dev/sdX

Optional targets

  • Building bootloader only:
Build Target Build command binary file location
bootloader bitbake -k imx-boot ${BUILDDIR}/tmp/deploy/images/${MACHINE}/imx-boot-tagged