[ltp] T30 serial ports

[Pino Giaquinto]

I have a ThinkPad T30 (Fedora Core 3)
In system log I can see:

...
Serial: 8250/16550 driver $Revision: 1.90 $ 76 ports, IRQ sharing enabled
ttyS0 at I/O 0x03f8 (irq = 4) is a NS16550A
ttyS1 at I/O 0x02f8 (irq = 3) is a NS16550A
...

but using 'setserial /dev/ttyS0' and 'setserial /dev/ttyS1' I see:

/dev/ttyS0, UART: undefined, Port: 0x03f8, IRQ: 4
/dev/ttyS1, UART: undefined, Port: 0x02f8, IRQ: 3

My questions are:

1) why 'UART: undefined' ?
2) is /dev/ttyS1 the IRDA port ?
3) Need I a driver for my Siemens S55 to connect to internet (GPRS) using 
serial cable or IRDA ?