topic Re: V4L2 Problem on imx8QM in i.MX Processors

V4L2 Problem on imx8QM

CYL — Fri, 05 Feb 2021 09:35:38 GMT

Dear NXP，

We use the L5.4.70_2.3.0_MX8QM Linux release， and follow the guide：https://www.nxp.com.cn/docs/en/user-guide/IMX_LINUX_USERS_GUIDE.pdf

then flash to SD Card：sudo dd if=imx-image-multimedia-imx8qmmek.wic of=/dev/sd bs=1M conv=fsync

Using this SDCard， we can boot the linux os. But, when we check the v4l2 function, Crash occurred.

Details in the attach file : Crash.TXT, the dmesg.

Any idea or suggestions?

Best regards

CYL — Sun, 07 Feb 2021 08:44:39 GMT

Try to change boot params， works

hsaito — Tue, 16 Mar 2021 01:28:44 GMT

Hello, CYL

Sorry, forgive a sudden reply. I'm having the same phenomenon.

Would you tell me about change boot params.

Best Regards,

CYL — Wed, 17 Mar 2021 03:29:44 GMT

Input below commands in uboot command line：

setenv fdt_file xxxx.dtb（a device tree which include the video-in device， I use the hdmi-in dtb file）

saveenv

boot

hope that will take effect for you

hsaito — Wed, 17 Mar 2021 08:18:42 GMT

Thank you for reply.

I will refer to your procedure.

Regards,