UART1 not working

[Hommus]

UART1 (/dev/ttyTHS0) is not capable of sending or receiving any messages.
The message is being sent from an arduino zero with the following code:

#include "Arduino.h"
void setup() {
  Serial.begin(115200);
  delay(1000);
}
void loop() {
  Serial.write("TESTTEST");
  delay(1000);
}

1. The output of the arduino zero has been verified using an oscilloscope and a logic analyzer.
2. nvgetty has been disabled
3. The user groups has been updated to include dialout
4. The voltage arrives at the Xavier SOC as 1.8v on our custom board

We need to be able to use UART1 to move forward. Any suggestsions on what is going wrong would be welcome!

EDIT [Added details]
Jetpack 32.7.1
Xavier NX Module in custom carrier board

[JerryChang]

hello Hommus,

did you meant pin-8/10 on J12 expansion header?
Xavier series is using combined UART, you may try following Topic 232547 to disable it.
however,
we have not fully test/verify the use-case by disabling combined uart.