Serial console connection problem

[Jonathan Chen]

On Thu, Apr 07, 2005 at 11:23:33AM +0300, Jani Luukkanen wrote:
> Hi!
> 
> I have an issue with serial console connection with two FreeBSD machines 
> (Both with Intel SE7210TP1-E motherboard, other configured as "host" 
> from bios and other has ordinary com ports which are connected with 
> normal tested serial cable).
> 
> Host machine is running FreeBSD 5.3 and the "client" one 4.10.
> 
> Problem is that when trying to open the serial connection with tip, 
> error occurs as;
> 
> /root at mos root # tip com1
> tip: /dev/cuaa0: Device busy
> link down

Try running fstat(1) against /dev/cuaa0 to try to find out what's
holding the device. If I understand you correctly, you're doing this
on the 4.10 machine.

> 
> Main question is that how to get access first to the com1 port generally 
> and second to get ahold of the remote screen on the other end of the 
> serial cable?

Make sure that you haven't got a getty running at the same time on
both sides, and that you've got a null-modem connection between the two
hosts instead of a straight thru'.

Cheers.
-- 
Jonathan Chen <jonc at chen.org.nz>
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                         Power corrupts, Absolute Power is pretty neat