I need use the serial port of the palm TX, i have the cable multi-connector to DB9 (http://serialio.com/products/cables/PalmMulti_RS232.php)

For test the serial port i install "minicom" (i use minicom in my desktop computer without problems) and connect TX to RX in the DB9 (pin 2 to pin 3), in the palm TX i see 3 serial ports ( /dev/ttyS0, /dev/ttyS1 and /dev/ttyS2), and no one works. To see the configuration of the serial ports i install "setserial" , when execute the command "setserial -a /dev/ttyS0", the response is;

root@palmtx:~$ setserial -a /dev/ttyS0
/dev/ttyS0, Line 0, UART: undefined, Port: 0x0000, IRQ: 22
Baud_base: 921600, close_delay: 50, divisor: 0
closing_wait: 3000
Flags: spd_normal

and for the others ports is the same:

root@palmtx:~$ setserial -a /dev/ttyS1
/dev/ttyS1, Line 1, UART: undefined, Port: 0x0000, IRQ: 21
Baud_base: 921600, close_delay: 50, divisor: 0
closing_wait: 3000
Flags: spd_normal

root@palmtx:~$ setserial -a /dev/ttyS2
/dev/ttyS2, Line 2, UART: undefined, Port: 0x0000, IRQ: 20
Baud_base: 921600, close_delay: 50, divisor: 0
closing_wait: 3000
Flags: spd_normal

with this i suppose that the irq are configurated but not the port. to know which port correspond to each
/dev/ttySx i'm based in the information that appears when linux are booting:

pxa2xx-uart.0:ttyS0 at MMIO 0x40100000
(irq=22) is a FFUART
pxa2xx-uart.1:ttyS1 at MMIO 0x40200000
(irq=21) is a BTUART
pxa2xx-uart.2:ttyS2 at MMIO 0x40700000
(irq=20) is a STUART

using setserial i attempt configure that port, but have the following message:

root@palmtx:~$ setserial /dev/ttyS0 port 0x40100000
Cannot set serial info: Invalid argument

and i'm sure with the sintaxis because i used the same command in the desktop PC

excuse me for the extension, but i want be specific with the problem,,

I will appreciate any comment, link or clue that can give a ligth about this..