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I have now been able to eliminate this error source, by rereading the
setserial man page. ;-)
setserial /dev/ttyS0 baud_base 115200
and configure the LX to 9600 8n1
does the trick. I still don't know why, but now it works. I can verify
it with starting datacomm on the LX, setting it to 9600 8n1, terminal
type TTY and then doing a
echo hello > /dev/ttyS0
on the Linux box. Gives a "hello" on the LX.
In the other direction, if I do a
on the linux box, and enter hello[enter] on the LX, I get a hello on
the linux console.