Wednesday, April 21, 2021

[fedora-arm] Jetson Nano: Access to GPIO header serial?

I have an Nvidia Jetson Nano that I was gifted by the Fedora project to troubleshoot some arm specific packaging issues. That's done now so I decided to see what else I could do with it.

I found NodeRED which had a module for the Raspberry Pi to control the GPIO. I have since forked that project and have made some progress porting it to the Nano. 

Now I want to see if I can get the serial header working. From what I can tell if running the linux OS provided by Nvidia there should be a serial device named /dev/ttyTHS1 but it's not getting detected AFAICT grepping through dmesg.

I found the page for the serial-tegra that should be in the linux kernel but if I try:

# modprobe serial-tegra

Nothing happens, no output if I try adding "-v" as an option either. So does the module exist or not? If I try some random name in modprobe it gives an error which makes me think it's present, but it doesn't load and doesn't give me any helpful reason why.



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