Disable Serial Login on ttyTHS1

Hello,
I connected an external device via UART pins at the J41 40-pin connector on the jetson nano developer kit. As mentioned here https://www.jetsonhacks.com/nvidia-jetson-nano-j41-header-pinout/ this is UART2 and it is accessible via ttyTHS1. I can send/receive data to/from the external device via my own C application. But it doesn’t work stable. Now I saw that when I connect via a terminal program from pc, a login prompt appears on ttyTHS1.

  1. Is there another UART wich is not used by the system internally and which can be used by own applications?

  2. How can I disable console login via ttyTHS1 without modifiying kernel, device tree or boot options as mentioned here https://devtalk.nvidia.com/default/topic/1050148/jetson-nano/serial-console-setup-parameters/? Is there a service which could just be stopped to achieve this?

Thanks a lot

Marc

hello marc.szenner,

  1. you’re able to setup another serial console with J44, please also note that Tx/Rx pins were mentioned in the bottom of the board.
  2. please refer to Topic 1050565 for the steps to enable auto-login.
systemctl disable nvgetty
reboot