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iMX8QM-MEK UART from SCFW

Question asked by Stuart Rubin on Mar 30, 2020
Latest reply on Mar 30, 2020 by igorpadykov

I have made nominal changes to the SCFW and would like to have some debug output to the terminal. I need to use the same USB-to-Serial port which is used by U-Boot and Linux for their terminals ("USB Debug", J18, /dev/ttyUSB0).

 

I have built the SCFW with various debug / UART settings, but whatever I do, I do not get any output from the SCFW on the terminal. The first things I see on the terminal are from U-Boot.

 

Without any changes to the SCFW source code, I build like this:

$ make qm R=B0 B=myboard D=1 DL=3 U=0 M=1

and have experimented with other DL, U, M settings.

 

Ideally, I would like to still have the U-Boot and Linux terminals working on the USB Debug terminal as well, but I'm not sure if that is possible.

 

Thank you very much!

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