Why is ttyTHS0 used as terminal output on Xavier NX, but not on Orin NX and Orin Nano?

Robotics & Edge Computing Jetson Systems Jetson Xavier NX
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Maybe you could refer to the following threads to check if it could help.

  1. UART1 cannot be used immediately after booting - Jetson & Embedded Systems / Jetson Xavier NX - NVIDIA Developer Forums
  2. Jetson NX uart1,I want use uart1 as rs422 ,FullDuplex-Mode, Meet error ‘TIOCSRS485:Inappropriate ioctl for device’ - Jetson & Embedded Systems / Jetson Xavier NX - NVIDIA Developer Forums

and with the following command:

$systemctl stop nvgetty
$systemctl disable nvgetty

Please also provide the serial console log for further check.