From: Darich Runyan (darichomni-infosec.com)
Date: Thu May 01 2003 - 20:35:11 CDT

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All,

I need to get boot messages to output to com2 (0x2f8 on my PowerEdge).
Sending BIOS output to the port is easy since it is configured in the BIOS,
and I have successfully gotten the login prompt on com2 via the following
directive in /etc/ttys:

tty01 "/usr/libexec/getty std.9600" vt100 on secure

But I have still not been successful with getting the boot output to goto
ocm2. At first I tried to set tty com2 at the boot prompt and in
/etc/boot.conf, neither of which worked. After some searching on the
mailing list I found a reference to a requirement to add the following
options to the config file and add this support to a custom kernel:

option CONUNIT=1
option CONADDR=0x2f8

This would be the address of my com2; however, this was in reference to com1
and in the include file where these are hard coded it mentions that CONUNIT
must be 0.
 
/*
 * WARNING: Serial console is assumed to be at COM1 address
 * and CONUNIT must be 0.
 */
#ifndef CONADDR
#define CONADDR (0x3f8)
#endif
#ifndef CONUNIT
#define CONUNIT (0)
#endif

With that said, what should I be setting CONUNIT to for com2 at address
0x2f8 or does it not matter?

Thanks again in advance for the assistance.

Darich

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