-A, --arch     set architecture to 'arch' (string [=arm])
  -O, --os       set operating system to 'os' (string [=rtos])
  -a, --addr     set load address to 'addr' (hex) (string [=0x0])
  -e, --ep       set entry point to 'ep' (hex) (string [=0x0])
  -o, --old      input old file name (string)
  -n, --new      input new file name (string)
  -p, --patch    output patch file name (string)
  -?, --help     print this message

typedef struct image_header
{
    uint32_t ih_magic; /* Image Header Magic Number */
    uint32_t ih_hcrc;  /* Image Header CRC Checksum */
    uint32_t ih_time;  /* Image Creation Timestamp */
    uint32_t ih_size;  /* Image Data Size */
    uint32_t ih_load;  /* Data Load Address */
    uint32_t ih_ep;    /* Entry Point Address */
    uint32_t ih_dcrc;  /* Image Data CRC Checksum */
    uint8_t  ih_os;    /* Operating System */
    uint8_t  ih_arch;  /* CPU architecture */
    uint8_t  ih_type;  /* Image Type */
    uint8_t  ih_comp;  /* Compression Type */
    uint8_t  ih_name[28]; /* Image Name */
    uint32_t ih_ocrc;  /* Old Image Data CRC Checksum */  
} image_header_t;