Re: problem in accessing register for at91rm9200

["Andrew Victor" <avictor.za@xxxxxxxxx>]

hi,

> i m using the atmel at91rm9200 board on which vender has ported linux 2.6.14

I do recommend you upgrade your kernel - 2.6.14 is 2.5 years out-of-date.


> is i m accessing the pio registers like PIOB_PDSR to know the status.i m
> accessing it by giving the absolute address (0xfffff63c) of the register and
> getting the segmentation fault.

The correct method is to use the GPIO API defined in
include/asm-arm/arch-at91/gpio.h.
So instead of reading PDSR directly to determine the state of a pin, you do:
     at91_get_gpio_value(AT91_PIN_PB10);
OR
     gpio_get_value(AT91_PIN_PB10);           /* preferred method */


Regards,
  Andrew Victor

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