ML300-gpio

[colui77 at virgilio.it]

hi all,
I'm working with the ML300 platform running the shipped Montavista Linux
(and hw configuration). I need to use the onboard gpio and I found a driver,
the xilinx_gpio, that I have loaded (insmod xilinx_gpio). After insmoding
the driver it is registered in /dev/xgpio (why is not it loaded in /proc/
before?) I have tried to use the GPIOs...

cat "111111000000" > /dev/xgpio

I was expecting some leds lighting but nothing at all...
Is there someone experienced with the ml300 gpios? 
Please I need help
Luigi