i.MX8MQ serial debug console port change

[nirmalluhana]

Hello,

Release: Yocto-Sumo (4.14.78_1.0.0_GA)

Board: i.MX8MQ based custom board

I want to change the debug console from UART1 to UART3 on iMX8MQ based board. I have updated header, source and dts files at U-boot source and did necessary changes in the kernel sources. But, I was not able to get data over other UART3 port.

I have attached a patch that I applied to the U-boot source.

Is anything I am missing to do that? If any working solution is available then provide the same.

Thanks and regards,

Nirmal

[diegoadrian]

Hello,

Could you please try modifying the  <build-dir>/source/meta-fsl-bsp-release/imx/meta-bsp/machine/imx8mqevk.conf file with the following configuration and see if that solves the problem?

 -   SERIAL_CONSOLES = "115200;ttymxc0"

+   SERIAL_CONSOLES = "115200;ttymxc2"

Best regards,

Diego.

[nirmalluhana]

Hello Diego Adrian Cuevas,

Thanks for the update.

I have added the change which you suggested along with my previous changes. Still, the problem is not solved and I am not getting the logs over UART3 port.

Have you verified the changes which you suggested? Are there any other changes required to solve this issue?

Best regards,

Nirmal

[diegoadrian]

Hello,

I get notified that this is impossible. Since the UART for the serial debug is specified in the ROM code, and unfortunately, it is impossible to modify the ROM code. I apologize for the inconvenience this may give you.

Best regards,

Diego.

[nirmalluhana]

Hello Diego Adrian Cuevas,

Thanks for the update.

How I can use this UART1 port for other peripheral? Also, if I disable the logs from that UART port then how to I get logs on another UART port?

BR

Nirmal

[diegoadrian]

Hello,

Unfortunately, the UART1 is only used for the debug console and it cannot be modified (or we do not recommend it). It will be always used as the debug console. I apologize for the inconvenience this may give you.

Best regards,

Diego.

[nirmalluhana]

Hello Team,

Any update on this topic?

Best regards,

Nirmal