control LED(GPB5~8) mini2440

Hello  all.

I charenged to control GPB5~GPB8 (LED conected) by this program.

################################################
//ledtest.c

#define GPBCON (*(volatile unsigned long *)0x56000010)
#define GPBDAT (*(volatile unsigned long *)0x56000014)

int main()
{
    GPBCON = 0x00005400;
    GPBDAT = 0x00000000;

    return 0;
}
################################################ 
But on mini2440, this program is not excecuted,and made Segmentation fault.
I have no idea how to control GPBx.

Search for keywords like "memory management unit", or "virtual / physical
addresses", or "memory mapping" and also read the manpage of the mmap()
system call to make your program work.

Juergen Beisert 

thanks good advice