GPIO OF OMAP5912

["w.b.b" <rememberme_2000@126.com>]

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hi:

 i want to do some work about OMAP5912'GPIO.but I am failed to do that.

 the following is a simple program:

test.c 

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#include <stdio.h>
#include <unistd.h>
#include <asm/io.h>

#define GPIO3_OUT 0xfffbbc40 /* lp1 */

int main()
{
  /* Get access to the ports */
  
  
  /* Set the data signals (D0-7) of the port to all low (0) */
  outb(0xffff, GPIO3_OUT);
  
  /* Sleep for a while (100 ms) */
  usleep(100000);
}
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arm-linux-gcc -g test.c -o test.out
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I run the binary file on the omap:./test.out
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but i get the result:segmentation falt!
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who can provide me with information? if you have done work related with gpio,would you like send me some examplefile?                                
   thanks!

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