RSB-3720 Ubunut creation by Yocto30 kernel

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Prepare Image

• Build Yocto Linux image with your expected version (e.g. A0386)

You can follow this SOP to build your Yocto image.

• Modify kernel to "Add commit to support the Ubuntu desktop version"

•  Prepare Ubuntu image (e.g. A0362)

 

Mount image

• You can find Yocto image in${WORKSPACE}/build/tmp/deplay/image/${MC}, and copy to your ${WORKSPACE}.

$ sudo cp –a imx-image-${MC}-20230816082527.rootfs.wic.bz2 ${WORKSPACE}.

• Unpack rootfs.wic

＄sudo bzip2 -d ${rootfs.wic_IMAGE}.bz2

• Create folders to mount

＄mkdir ubuntu yocto

＄mkdir ubuntu/rootfs yocto/rootfs

• Mount Yocto image and Ubuntu image Partition2

＄sudo losetup --show -f -P ${rootfs.wic_IMAGE}

＄sudo mount /dev/loop22p2 yocto/rootfs/

＄sudo losetup --show -f -P 3720A1AIM30UIVA0362_iMX8MP_4G_2021-11-29.img

＄sudo mount /dev/loop23p2 ubuntu/rootfs/

 

 

Change rootfs

• Copy Yocto module to ${WORKSPACE}, then you can find Yocto module in rootfs/lib

$ sudo cp -a yocto/rootfs/lib/modules/ /home/adv/

• Delete under Yocto rootfs all files, and replace with  Ubuntu rootfs

$ sudo rm -rf yocto/rootfs/

$ sudo cd ubuntu/rootfs/

$ sudo cp -a bin boot dev etc home lib media mnt opt proc root run sbin srv swapfile sys tmp usr var ~/yocto/rootfs/

• Replace with Yocto module

$ cd ~/yocto/roosfs/lib

$ sudo rm -rf modules/

$ sudo cp -a ~/modules ~/yocto/rootfs/lib/

Analyze dependency file

• Enter target image root directory

$ sudo chroot rootfs/

• Analyze file replaced by module dependencies

$ depmod -a 5.4.70-2.3.0/

 

Umount target image

• Umount rootfs

$ exit

$ sudo umount ~/yocto/rootfs/

$ sudo umount ~/ubuntu/rootfs/

• Remove virtual device

$ sudo losetup -d /dev/loop22

$ sudo losetup -d /dev/loop23

 

Flash target image

• Creating boot-up on-board flash from built sdcard image

$ sudo dd if=${rootfs.wic_IMAGE} of=/dev/sde bs=1M conv=fsync

 

Complete

• Pleace insert SDcard to target machine and booting, You can see Ubuntu Desktop on the monitor.