How to write config file of AVRDUDE ?

Hi there,
I am trying to program ATmega8U2 with avardude but as avrdude does not support it I have to add this device in its config file, I have seen the reference for it on many site but none of them explains what is the mode, delay and etc in EEPROM and flash sections of config. I used ATmega8 config setup as reference and there is a line says mode = 0x04 and then the delay and other things, Can any one tell me where I can find these information about ATmega8U2 ? I dont know where to find it in datasheet.


Please help

Thanks,
Chris