> > Now with FC6 (the Xen kernel anyway), I get an error claiming > > that is an unrecognized option, and I only see 4 uarts in /dev. > > I am using the regular non-xen kernel (2.6.18-1.2798.fc6, i686 version). That's interesting, because the (x86_64) non-xen kernel works for me. I have all my details in: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=212501 you might want to add your results to it.