I also note that you didn’t even try to answer the questions I asked - following a series of one-line answers pointing me to other message board postings is what has got me this far, but I have yet to read a confirmation that anyone has got ‘clean uart’ behaviour out of the debug uart on Xavier NX.
So, for clarity:
Is it possible to completely disable the use of this UART, other than from user-space after the kernel is booted? e.g. when powering up the Jetson Xavier NX - no output whatsover should appear on this uart, from any peripheral.
Once the kernel is booted - is it possible to send and receive data on this uart reliably via the tegra highspeed uart driver, as if was a standard port behaving the same way as the ttyTHS1 device?