iMX8MP-COMPACT-CM Yocto Linux

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Overview

The Yocto Project is an open source collaboration project that helps developers create custom Linux-based systems for embedded products, regardless of the hardware architecture.
This article show how to build Yocto Image for iMX8MP-COMPACT-CM CPU module using:

Linux Kernel U-BOOT
Yocto micledore 6.1.55 v2023.04

Learn more about Yocto

Setting Boot mode

Boot mode setting on carrier board
BOOT J4:1-2 J4:3-4 J4:5-6 J4:7-8
Cortex-A53 Serial Downloader close open open open
Cortex-A53, eMMC open close open open

Terminal Setup

The carrier board connects the host PC using the micro-B USB connector (J6).
Common serial communication programs such as Minicom, HyperTerminal, Tera Term, or PuTTY can be used.
The iMX8MP-COMPACT-CM board uses the second port for the Arm Cortex-A cores console.

Installing required packages

Please make sure your host PC is running Ubuntu 20.04+ 64-bit and install the following packages: 

$ sudo apt-get install gawk wget git diffstat unzip texinfo gcc-multilib \
build-essential chrpath socat cpio python3 python3-pip python3-pexpect \
xz-utils debianutils iputils-ping libsdl1.2-dev xterm python-is-python3 lz4

$ sudo apt-get install autoconf libtool libglib2.0-dev libarchive-dev python-git-doc \
sed cvs subversion coreutils texi2html docbook-utils \
help2man make gcc g++ desktop-file-utils libgl1-mesa-dev libglu1-mesa-dev \
mercurial automake groff curl lzop asciidoc u-boot-tools dos2unix mtd-utils pv \
libncurses5 libncurses5-dev libncursesw5-dev libelf-dev zlib1g-dev bmap-tools

More details about the Yocto Environment Setup can be found on the Yocto official site

Download Yocto based on Freescale Community BSP

$ git config --global user.name "Your Name"
$ git config --global user.email "Your Email"

$ mkdir ~/bin 
$ curl http://commondatastorage.googleapis.com/git-repo-downloads/repo > ~/bin/repo
$ chmod a+x ~/bin/repo
$ export PATH=~/bin:$PATH

$ mkdir ~/yocto-ronetix
$ cd ~/yocto-ronetix
  • Download the Yocto repository
$ repo init -u https://github.com/ronetix/imx-manifest -b imx-linux-mickledore -m imx-6.1.55-2.2.0.xml
$ repo sync

Setup and build Yocto

  • Setup first time:
$ MACHINE=imx8mp-cm DISTRO=fsl-imx-xwayland source ./imx-setup-release.sh -b build-imx8mp-cm
  • or setup if already configured:
$ source setup-environment build-imx8mp-cm
  • Build:
$ bitbake imx-image-core

Build Results

The resulted images are located in tmp/deploy/images/imx8mp-cm.

Booting Linux

This section describes how to copy the images (U-Boot, Linux kernel, device tree, and rootfs) to the eMMC device on the module.

Universal update utility

The Universal Update Utility (UUU) runs on a Windows or Linux OS host and is used to download images to devices on an i.MX board.

Downloading UUU

Download UUU version 1.5.21 or later from https://github.com/nxp-imx/mfgtools/releases

Write WIC image info eMMC

Follow the instructions below:

  • Connect a USB cable from a computer to the J7, port USB Type C port on the carrier board for download link.
  • Connect a USB cable from J6, port UART-DBG (Micro-AB) port to the computer for console output.
  • Open a Terminal emulator program
  • Set the boot mode to "Cortex-A53 Serial Downloader", see #Setting Boot mode
 $ cd tmp/deploy/images/imx8mp-cm
 $ uuu -b emmc_all imx-boot-tagged imx-image-core-imx8mp-cm.wic.zst

Boot Linux

See also

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