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  1. or download this
    open(FH, "<", "/dev/mem");
binmode(FH);
seek(FH,0xff230180,0);  #Fails with bad address
  2. or download this
    devmem_fd = open("/dev/mem", O_RDWR | O_SYNC);
bridge_map = (uint32_t*)mmap(NULL, 0x100, PROT_READ|PROT_WRITE, 
...
printf("Register contents: 0x08x\n", *reg);
munmap (bridge_map, 0x100);
close(devmem_fd);