UART port configuration for stdout/stdin/stderr in u-boot

[masa-ori]

I am looking for information how to configure uart4 as console I/F in u-boot, because only uart4 can be assigned on my target board (i.MX8MP), and other else pins are used.

As a first step, I am trying to change the u-boot configuration on a i.MX8MPlus-BB EVK board.

In the u-boot source, I found CONFIG_MXC_UART_BASE is set as UART2_BASE_ADDR in the include/configs/imx8mp_evk.h and changed to UART4_BASE_ADDR, but board was stacked.

So please advise me how to configure uart4 as u-boot console.

Thanks in advance.

[jackie2]

You can refer to the following link.

https://community.nxp.com/t5/Blog/How-to-Change-i-MX8MM-evk-Linux-Debug-UART/ba-p/1243938

[masa-ori · Accepted solution]

Hi jackie2, thank you for information.

It takes a week because imx-atf build is challenge for me, I modified sources according to given information.

Finally build was completed and checked it is working.

Thank you.