Armbianmonitor: Hi everyone, I'm trying to use the serial port on pins 8+10 on an ODroid C2. My understanding is that this maps to /dev/ttyS1 by default, but whenever I try to use this serial port, or any of ttyS0, S1, S2, S3, I get the error "Input/output error". root@odroidc2:~# stty raw -crtscts 9600 < /dev/ttyS1 stty: 'standard input': Input/output error root@odroidc2:~# cat /dev/ttyS1 cat: /dev/ttyS1: Input/output error I hav