How to make ttyTHS1 work?

Autonomous Machines Jetson & Embedded Systems Jetson TX1
1

I have a custom-built tx1 board and JetPack version is 24.2.In my application, I need 3 serial ports.
ttyS0 as console port, and ttyTHS2 as normal serial port, both two work well, but ttyTHS1 doesn’t.
I first set baud rate of ttyTHS1, then use the command: echo help > /dev/ttyTHS1, no TTL signal can be seen on TX by oscillometer.
I haven’t modified device tree related to serial ports and pinmux. I am not certain if this problem is caused by pinmux or something else. I have looked through <Tegra_X1_TRM_DP07225001_v1.1p.pdf> but found it useless.
Could anyone provide any help?

2

I’d guess pinmux, but first see if drivers see the device. If you run “ls -l /dev/ttyTHS1”, what shows? On a default TX1 it is major/minor “240, 1”. In “/sys/class/tty/ttyTHS1/” there is file “dev”…“cat dev” would reflect this same thing: “240:1”.

3

This is what is showed after command:ls -l /dev/ttyTHS1
crw-rw---- 1 root dialout 240, 1 Feb 11 2016 /dev/ttyTHS1

4

The problem has been solved. It’s caused by a welding defect. Thank you.