[BRLTTY] some serial help

[Jason White]

Rob Hudson <captinlogic at gmail.com> wrote:
> I had a PCI serial card in one of my boxes (that is, a PCI card with a
> serial port on it.) I had to remove it for another box, and i put another
> card in, this one with two serial ports on it. NOw, in /dev we have ttyS0 1
> 2 and 3. I think the kernel still thinks the old card is still there,
> because it should be ttyS0 1 and 2, right?  In any case i can't get brltty
> to go through either of those ports, /dev/ttyS 1 2 or 3. What can I do to
> fix this? 

The kernel detects the serial ports during the boot process, so no, it doesn't
save any details regarding the serial port on the old card.

I would suggest looking at the boot messages to confirm that the card and the
serial ports on it are detected. If you have another serial device (not a
braille display), you should test writing output to the ports, e.g., echo some
text > /dev/ttyS0 (try several of the serial devices until you find the one
that matches the port).

Once you have the serial port confirmed to be working, then configure BRLTTY
to use it. If that still doesn't work, it's time to collect debug output and
check kernel logs.

Some USB to serial adapters don't implement all of the serial lines correctly;
I don't know whether this is an issue on PCI cards though.