[Fedora-xen] ups connected to serial port, but can't communicate via ttyS0

[Richard W.M. Jones]

Kanwar Ranbir Sandhu wrote:
> Hi,
> 
> I tried to use ttyS0 in dom0 for a serial interface UPS, but apcupsd
> complains that it can't talk to ttyS0. I look through /var/log/messages,
> and sure enough, xen is using it:
> 
> Jul  3 09:45:22 xenmaster kernel: Xen virtual console successfully
> installed as ttyS0
> 
> Can that be turned off, so that ttyS0 isn't used by Xen?  I tried to do
> this several months ago, but back then I was told Fedora was working
> towards fixing the serial port access problems.

Try the suggestions here:

http://phaq.phunsites.net/2007/06/30/xen-console-grabbded-devttys0/

In particular try booting with xencons=off (on the kernel command line, 
not the Xen hypervisor command line).

Rich.

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