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.