I wrote a code for a custom ISA peripherical interface. The 8bit outpout I 
want to send data is mapped at 0x320.

I get a "Bus error (core dumped)" when I run my app with this code inside.

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <curses.h>
#include <sys/types.h>
#include <machine/joystick.h>
#include <machine/pio.h>

...

  int baseaddr, porta, portb, portc, contr;

  /* Initialize Isa interface */
  baseaddr = 0x320;
  porta = baseaddr;
  portb = baseaddr + 1;
  portc = baseaddr + 2;
  contr = baseaddr + 3;

  /* put high state on 8 pins of port a */
  outb(porta, 255);

...

It should work since it's raw data in/out. What do I need to make this work 
? i/o permission ?

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