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README.md
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README.md

imx8 system

Yocto image

Building

  • The the repo tool (curl https://storage.googleapis.com/git-repo-downloads/repo > repo && chmod +x repo to a directory in PATH)
  • Make project dir mkdir imx-yocto-bsp && cd imx-yocto-bsp
  • Get the yocto image repo (this takes some time)
    • Hardknott: repo init -u https://source.codeaurora.org/external/imx/imx-manifest -b imx-linux-hardknott -m imx-5.10.72-2.2.0.xml
    • Kirkstone: repo init -u https://source.codeaurora.org/external/imx/imx-manifest -b imx-linux-kirkstone -m imx-5.15.32-2.0.0.xml
    • repo sync
  • Configure the build DISTRO=fsl-imx-wayland MACHINE=imx8qmmek source imx-setup-release.sh -b build
  • Edit build/conf/local.conf:
    • (If building from within CIIRC which can't reach example.com) Append line CONNECTIVITY_CHECK_URIS ?= "https://rtime.felk.cvut.cz/"
    • Append line: INHERIT += "rm_work" to not keep work files around (up to 130GB)
    • TODO: Append line: THERMAC_BSP = "nxp" or THERMAC_BSP = "mainline"
      • Selecting mainline primarily changes from nxp library blobs to mesa OpenGL etc. libraries
      • TODO: Doesn't compile
    • TODO: MACHINE_USES_VIVANTE_KERNEL_DRIVER_MODULE = "0"
  • Edit build/conf/bblayers.conf:
    • Append line: BBLAYERS += "${BSPDIR}/sources/meta-thermac"
    • Symlink or copy the system/meta-thermac directory of this repository to sources/meta-thermac
  • Start the build bitbake imx-image-multimedia (this takes a lot of time)
  • The adasmark recipe requires the adasmark-1.0.1.tar.gz tarball
    • Bitbake will list all paths it searches when the file is missing and the recipe is invoked.
    • One of these places is imx-yocto-bsp/downloads

Using

  • The important files are in build/tmp/deploy/images/imx8qmmek/ (with a different git tag)
    • Device tree: imx8qm-mek--5.10.35+git0+ef3f2cfc60-r0-imx8qmmek-20210823112039.dtb
    • Boot image: Image--5.10.35+git0+ef3f2cfc60-r0-imx8qmmek-20210823112039.bin
    • Kernel modules: modules--5.10.35+git0+ef3f2cfc60-r0-imx8qmmek-20210823112039.tgz
    • Rootfs: imx-image-multimedia-imx8qmmek-20210823112039.rootfs.tar.bz2
  • Further packages can be built inside the shell sourced environment (when building):
    • Restore environment: source setup-enviroment build
    • Build package: bitbake clinfo, bitbake pocl etc.
    • Rebuild package index: bitbake package-index
  • Serve debian packages: See misc/serve_deb.sh
    • Don't forget to bitbake package-index after a new package is built (and for the first time)
  • On the board:
    • Create /etc/apt/sources.list.d/ritchie.list:
      • Hardknott: 
         deb [trusted=yes] http://10.35.95.3:33038/all /
 deb [trusted=yes] http://10.35.95.3:33038/imx8qmmek /
 deb [trusted=yes] http://10.35.95.3:33038/cortexa72-cortexa53-crypto /
 deb [trusted=yes] http://10.35.95.3:33038/cortexa72-cortexa53-crypto-mx8 /
      • Kirkstone: 
         deb [trusted=yes] http://10.35.95.3:33038/all /
 deb [trusted=yes] http://10.35.95.3:33038/imx8qmmek /
 deb [trusted=yes] http://10.35.95.3:33038/armv8a /
 deb [trusted=yes] http://10.35.95.3:33038/armv8a-mx8 /
    • apt-get update
    • Install packages: apt-get install <package name> (e.g. clinfo, pocl)

Notes

  • OpenEmbedded layer index https://layers.openembedded.org/layerindex/branch/master/recipes/
  • Manifest comes from https://source.codeaurora.org/external/imx/imx-manifest
  • Graphics recipes come from https://source.codeaurora.org/external/imx/meta-imx/
  • Graphics blobs can be obtained from https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/<file-name> (e.g. imx-gpu-viv-6.4.3.p2.0-aarch64.bin)
  • Clean bitbake completely with bitbake world -c cleansstate (or -c cleanall - also deletes downloaded files)

Booting

To boot the board using novaboot-shell (after having your ssh key registered):

Host thermac-boot
	HostName rtime.ciirc.cvut.cz
	User imx8
	IdentityFile ~/.ssh/id_something

To ssh into a booted board (assuming sshd is set up) using a proxy jump from ritchie:

Host thermac-root
	HostName imx8
	User root
	ProxyJump ritchie

Then, on one shell ssh thermac-boot and keep it open to hold the lock. In another shell ssh thermac-root to ssh into the board.

Novaboot

See misc/*.nova scripts for examples.

NFS

Userspace NFS server can be used to serve the image files over network. Compile the https://github.com/skoudmar/unfs3 project with the patch included in misc/unfs3-chown.patch to hack around chown/chmod permission issues.