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