VAG DMA protocol
Func 20 01 0a 00 00 - RAM Read 0A Func 21 03 0a 00 00 - ROM Read 0A Func 22 03 0a 00 00 - EEPROM Read FD Func 23 0C 01 00 00 xx - EEPROM Write 0A Func 25 01 0a 00 00 - RAM Loop Read 0A Func 26 19 0a 00 00 - SEEPROM Read FD Func 27 1A 01 00 00 xx - SEEPROM Write 0A