System and method for updating microcode stored in a non-volatile memory

A system comprising:

• means for receiving file sectors;
• means for generating first pass sector CRC codes for each file sector received during a first pass file transfer wherein each first pass sector CRC code is based at least in part upon the contents of the corresponding sector;
• means for storing each first pass sector CRC code in volatile system memory;
• means for Extracting a final CRC code embedded in the file wherein the final CRC code is based upon the contents of the entire file;
• means for comparing the first pass sector CRC code of the final sector to the final CRC code;
• means, responsive to the comparing means, for initiating a second pass transfer of the file sectors;
• means for generating second pass sector CRC codes for each sector received during the second pass transfer and for comparing the second pass sector CRC codes to respective first pass sector CRC codes;
• and
• means for storing sectors in flash memory if their second pass sector CRC code matches their first pass CRC code for the sector.

A method of verifying the integrity of a microcode file transferred as a plurality of sectors comprising:

• generating first pass sector CRC codes for each sector during a first set of sector transfers and storing the first pass sector CRC codes in volatile memory of data processing system;
• responsive to the first pass sector CRC code of a last sector transferred during the first set of sector transfers matching a final CRC code that is based upon the contents of the entire microcode file, transferring the sectors of the microcode file to the system as a second set of sector transfers;
• generating second pass sector CRC codes for each sector during the second set of sector transfers;
• and
• responsive to the second pass sector CRC code for a sector matching the first pass sector CRC code for the sector, storing the sector in a destination medium.