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

[E. Robert Tisdale]

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

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

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

    Cannot get serial info: Invalid argument

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

    /dev/ttyS1: No such device or address

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

    /dev/ttyS2: No such device or address

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

    /dev/ttyS3: No such device or address

    [root at localhost ~]# dmesg | grep ttyS

    Xen virtual console successfully installed as ttyS0

    [root at localhost ~]# 



Why doesn't setserial work on these devices?