setserial [was: help with Fedora core 7 dial-up connection]

["E. Robert Tisdale" <edwin@xxxxxxxxxxx>]

   [root@localhost ~]# ls /dev/ttyS*

   /dev/ttyS0 /dev/ttyS1 /dev/ttyS2 /dev/ttyS3

   [root@localhost ~]# setserial -g /dev/ttyS0

   Cannot get serial info: Invalid argument

   [root@localhost ~]# setserial -g /dev/ttyS1

   /dev/ttyS1: No such device or address

   [root@localhost ~]# setserial -g /dev/ttyS2

   /dev/ttyS2: No such device or address

   [root@localhost ~]# setserial -g /dev/ttyS3

   /dev/ttyS3: No such device or address

   [root@localhost ~]# dmesg | grep ttyS

   Xen virtual console successfully installed as ttyS0

   [root@localhost ~]# 



Why doesn't setserial work on these devices?