Re: [Etherboot-developers] Serial Port Debugging

[Vasil V. <vas...@sy...>]

On Fri, 17 Jan 2003, Timothy Legge wrote:

> Hi
>
> I am getting somewhat fustrated with trying to get the serial port debugging working.  Here what I have done:
>
> 1) Enabled the Serial Console in Config (I assume there is only one spot)

There is an option for CRT Console and Dual Console (CRT and Serial). I am not
sure what the exclusions are.

> 2) Run minicom, with the same speed and the /dev/ttyS0 or /dev/ttyS1 port,
> 8N1 and ANSI.  (The status bar for minicom says Offline, is this normal).

I've seen minicom which says Offline and sending and receiving OK. I think
Offline is to do with the flow control pins, so if they are not connected you
may get Offline in minicom, but otherwise all else is fine.

Check the serial port configuration for etherboot and the ports the BIOS uses
for the serial lines.

> I had purchased a 9 to 25 pin null modem serial cable, nothing seemed to work.

Where do you connect the 25 pin end?

> Today, I purchased a 9 to 9 pin seial cable and a Null Modem adapter, nothing seems to work.
>
> I have deleted /dev/modem and /dev/mouse, so they are not interfering.

Have you tried lilo or booting linux kernel with the console parameter set:

in lilo.conf

serial=s,xxxxxn8

image=.....
	append="console=ttySs,xxxxx"


where s is the number of the port, say 0 or 1. xxxxx is the speed, say 9600.

Or even simpler, trying typing into /dev/ttyS0 or /dev/ttyS1 on either machine
and listening on the other.
This would at least establish whether the lines and cables are working without
etherboot.