Cannot Open /dev/ttyS0

[Frank Murphy]

How would I go about trying to sort this out?

http://fpaste.org/npPs/

Line 8: [    0.000000] Command line: 
BOOT_IMAGE=/vmlinuz-3.4.1-1.fc17.x86_64 
root=/dev/mapper/luks-93549421-e838-4947-8e79-5a94052313ba ro rd.md=0 
rd.lvm=0 rd.dm=0 rd.luks.uuid=luks-93549421-e838-4947-8e79-5a94052313ba 
rd.luks.uuid=luks-a629d892-ebcb-4f63-a4dc-03bbf0fb314d KEYTABLE=uk 
SYSFONT=latarcyrheb-sun16 LANG=en_IE.UTF-8 console=tty0 console=ttyS0

Line 94: [    0.000000] console [ttyS0] enabled
Line 252: 1.099605] 00:05: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
Line 328: Couldn't open /dev/ttyS0

"" 334: Cannot enter password.

Have this problem on two rawhide and one F17 virt-guests

Cannot see what's different, to the working boxes.
-- 
Regards,
Frank
"Jack of all, fubars"