I have a couple MAX3232 UART <> RS232 devices and couple CP210 UART <> USB bridge devices and I’m scratching my head trying to get a serial console running on UART2 (GPIO pins 6,8,10) or UART0 (GPIO pins 9,11,13).
On the Rock Pi X side I’m using CentOS 8 and I’ve tried every combination of console=ttyS0,115200 [or ttyS1, or ttyS2] on the GRUB kernel line at boot. I’ve also tried enabling serial-getty services for ttyS0, ttyS1, and ttyS2, but appending to the kernel line should do the job in any case.
On the Windows/PuTTY side, I’ve tried every combination of line speed and other serial settings/flow control, etc.
Has anyone else found the winning combination? The clearest information I have comes from the following link:
I wouldn’t mind experimenting with the debug UART on the bottom of the board, but I can’t seem to find the serial converter with the flat ribbon cable shown in the above link. Any idea how to search for that or where to buy?