Hi,

I have the same board and I had a similar problem. I use 2.6.30, so I don't know whether 2.6.25 supports the following - however, here's my suggestion. Set these options in your kernel config: CONFIG_GPIOLIB=y and CONFIG_PPC4xx_GPIO=y. Before compilation do "export KCPPFLAGS=-DARCH_NR_GPIOS=32" - you have to let the kernel know, that your GPIO has 32 pins (default value is 255) and compile the kernel.

Then change the line

compatible = "ibm,gpio-405ex";

to

compatible = "ibm,ppc4xx-gpio";

Ok! After this long journey you shoul be able to work with your GPIO pins with functions like gpio_set_value() - from include/linux/gpio.h. Documentation of these functions can be seen at http://www.mjmwired.net/kernel/Documentation/gpio.txt

So, this is my solution. Maybe there are better ones, but this works well for me :)

Best,
Lada Podivin