topic how can I generate .wic image by using u-boot, kernel image and rootfs in i.MX8QM in i.MX Processors

how can I generate .wic image by using u-boot, kernel image and rootfs in i.MX8QM

mallibeerala — Tue, 23 May 2023 07:19:27 GMT

Dear NXP Team,

how can I generate .wic image by using u-boot, kernel image and rootfs in i.MX8QM.

Thanks & Regards,
Mallikarjuna

Re: how can I generate .wic image by using u-boot, kernel image and rootfs in i.MX8QM

Dhruvit — Wed, 24 May 2023 12:56:35 GMT

Hi @mallibeerala,

I hope you are doing well

The .wic file can be generated using Yocto. Kindly refer to the i.MX Yocto Project User's Guide for the same.

To modify the .wic file and its partition using yocto, one can modify the particular sources/meta-freescale/wic/imx-imx-boot-bootpart.wks.in file from the sources directory.

For more information related to the same kindly refer to the below document.

https://docs.yoctoproject.org/ref-manual/kickstart.html

Thanks & Regards,

Dhruvit Vasavada

Re: how can I generate .wic image by using u-boot, kernel image and rootfs in i.MX8QM

mallibeerala — Thu, 25 May 2023 06:55:28 GMT

Hi Dhruvit,

Is it possible to generate .wic image without using yocto build, if yes please provide procedure for generate .wic image using u-boot, kernel image and root file system.

Thanks & Regards,
Mallikarjuna

Re: how can I generate .wic image by using u-boot, kernel image and rootfs in i.MX8QM

Dhruvit — Fri, 26 May 2023 09:05:51 GMT

Hi @mallibeerala,

I hope you are doing well

NXP does not have any document or procedure to generate a .wic file without using Yocto.

Please accept my apology for the inconvenience due to the same.

Thanks & Regards,

Dhruvit Vasavada

Re: how can I generate .wic image by using u-boot, kernel image and rootfs in i.MX8QM

rudi_cyber — Sat, 27 May 2023 02:20:43 GMT

.wic/.sdcard is just a sdcard mirror.

You can use the same commands of Yocto to do the same thing.

Yocto is just a "script"(bb file). Yocto can do that, you also can do that manually.

Alternatively, I would like to introduce you one very useful tool under linux.

It calls kpartx. It can simulate a virtual sdard mirror.

If you know how to create a sdcard mirror with a real sdcard on PC. You can use the kpartx do the same thing.

truncate -s 7900M 1.sdcard

sudo sgdisk -n 0:0:+2600M -c 0:"rootfs" -p 1.sdcard
sudo sgdisk -n 0:0:+600M -c 0:"data1" -p 1.sdcard
sudo sgdisk -n 0:0:+650M -c 0:"data2" -p 1.sdcard

sudo kpartx -av 1.sdcard

sudo dd if=flash.bin of=/dev/loop0 bs=1k seek=32 conv=fsync

sudo mkfs.ext4 /dev/mapper/loop0p1

mkdir mnt
sudo mount /dev/mapper/loop0p1 mnt/
sudo touch mnt/test.txt
ls mnt/
lost+found test.txt
sudo umount mnt
sudo kpartx -dv /dev/loop0

If you use a real sdcard, the device will be, for example, /dev/sda.

for kpartx, it will be /dev/loop0

If you use a real sdcard, the partition will be like /dev/sda1

for kpartx, it will be /dev/mapper/loop0p1