I wanted to tweak some u-boot parameters on a brand new Nano device (shipped last week, received Monday).
I followed the directions provided by Jetsonhacks for connecting to the serial console on J44. (Jetson Nano Style - Serial Console - JetsonHacks) This resulted in non-printable binary characters (shown in minicom as question marks) rendering to the terminal with roughly the cadence of a boot sequence.
If the serial UART is set up correctly with 115200 8N1, then possibly the character set could cause such a result. On both Jetson and host, what do you see for “echo $LANG”? Do the two differ?
One of the firmware guys from upstairs happened to stop by just now. I showed him the issue and he agreed that something was amiss. He came back with a proper six port FTDI TTL-232R-3V3 cable. That solved the problem, no further changes needed.
I have also faced similar problem…Using a prolific203 3.3V USB adapter, working fine for TX1 serial console, but failing to work on nano with J44 connector as shown by jetsonhacks…Checked the /proc/cmdline mentioned /dev/ttyS0 framing 115200 8N1.