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

[Richard Shaw]

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.

Ideas?

Thanks,
Richard