mkbootimg: add support for --dt

        args.base + args.second_offset,                 # physical load addr

        args.base + args.tags_offset,                   # physical addr for kernel tags

        args.pagesize,                                  # flash page size we assume

        args.header_version,                            # version of bootimage header

        max(args.header_version, filesize(args.dt)),    # version of bootimage header or dt size in bytes

        (args.os_version << 11) | args.os_patch_level)) # os version and patch level

    args.output.write(pack('16s', args.board.encode())) # asciiz product name

    args.output.write(pack('512s', args.cmdline[:512].encode()))

    update_sha(sha, args.kernel)

    update_sha(sha, args.ramdisk)

    update_sha(sha, args.second)

    update_sha(sha, args.dt)

    if args.header_version > 0:

        update_sha(sha, args.recovery_dtbo)

    parser.add_argument('--id', help='print the image ID on standard output',

                        action='store_true')

    parser.add_argument('--header_version', help='boot image header version', type=parse_int, default=0)

    parser.add_argument('--dt', help='path to the device tree image', type=FileType('rb'))

    parser.add_argument('-o', '--output', help='output file name', type=FileType('wb'),

                        required=True)

    return parser.parse_args()

    args = parser.parse_args()

    if args.header_version > 0 and args.dt != None:

        raise ValueError('header_version and dt cannot be set at the same time')

    return args

def write_data(args):

    write_padded_file(args.output, args.kernel, args.pagesize)

    write_padded_file(args.output, args.ramdisk, args.pagesize)

    write_padded_file(args.output, args.second, args.pagesize)

    write_padded_file(args.output, args.dt, args.pagesize)

    if args.header_version > 0:

        write_padded_file(args.output, args.recovery_dtbo, args.pagesize)