target = 0x20e004c;
  end = 0x20e035c;
  addr = target;

  map_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, target & ~MAP_MASK);
  if(map_base == (void *) -1) {
    printf("Failed to on mnap \n");
    exit(1);
  }

  printf("Pad Mux Registers Memory mapped at address %p.\n", map_base);
  for (addr; addr <=end;) {
    virt_addr = map_base + (addr & MAP_MASK);
    read_result = *((unsigned long *) virt_addr);
    printf("Value at address 0x%X (%p): 0x%X\n", addr, virt_addr, read_result);
    addr = addr + sizeof(unsigned long);
  }