On 7/10/2016 11:36 AM, Jacob Fish wrote: > On a side note, why is there a ttyS* tied with the ttyO*? I'd always assumed > that those where devices indicating that there is a shell console tied with > the > UART port. After this quick test, it would seem like this is incorrect to > assume. I was able to use either ttyO1 or ttyS1 to communicate from BBB to > RPi > without any issues. Why is this there?
ttyS* basically means "serial port", not "serial console". You won't get a console unless you run getty (see the commented examples in /etc/inittab for ttyS0 and ttyS1). IIRC, the earlier BBB kernels used /dev/ttyO* port naming (particularly prior to the TI Omap serial port driver being integrated with the kernel serial driver). I believe the symlinks are a convenience to keep older code/documentation working. Note the 3.x series kernels have this somewhat confused with port names and numbering changing between various kernel versions as the drivers were being updated, but I believe the 4.x kernels should all use standard /dev/ttyS* naming with consistent port numbering. -- Charles Steinkuehler [email protected] -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/4e1ec18f-92f5-e0ad-9aae-a6d02e4f3ce8%40steinkuehler.net. For more options, visit https://groups.google.com/d/optout.
