checksum v1.4 - RM-TEAM 09/2012,09/2013,05/2014
Usage: checksum [options] file.ext
  -add			compute 'ADD' checksum
  -xor			compute 'XOR' checksum
  -i val 		initial byte value of checksum [0]
  -s offset		offset to the file to start compute chcecksum [0]
  -l length		length of checksum block [LOF - offset]
  -c offset		offset to the file to write checksum byte [LOF - 1]
  -ca			append checksum byte to the end of the file
  -sl symb_list		list of symbol names which values will be used
			to compute checskum
			start_off,length,crc_off{;start_off,length,crc_off}
  -sf symbfile.ext	text file with symbols as #defines as in C-language

All numeric parameters must be nonnegative integers and can be in three forms:
  decimal (e.g. 12345)
  octal (e.g. 01234)
  hexadecimal (e.g. 0x1234)

