[avr-chat] Config AVRDUDE for ATmega8U2

[Henry Schwarz]

Hi. I am trying to program the ATmega8U2 on an Arduino Uno 
(http://arduino.cc/en/Main/ArduinoBoardUno) using the 8U2's ICSP 
interface. I would like to use AVRDUDE and SparkFun's Pocket AVR 
Programmer (http://www.sparkfun.com/products/9825).

However, the ATmega8U2 is not listed as a supported device for AVRDUDE, 
at least according to the list of parts at 
http://www.nongnu.org/avrdude/user-manual/avrdude_4.html.

I would have tried AT90USB82, as recommended for the Atmel Flip DFU 
programmer (http://arduino.cc/en/Hacking/DFUProgramming8U2) but that too 
is not listed.

The discussion at 
http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=91943 
suggests using the -F switch to disable signature checking, and to then 
use AT90USB162 which apparently is compatible, but again, that part does 
not seem to be listed as a supported device.

This link (http://forums.adafruit.com/viewtopic.php?f=24&t=19357) from 
2007 discusses this question, but they don't say that they successfully 
tested their recommended config.

Any suggestions on the best way to proceed?

(To avoid confusion, note that the Arduino Uno's main micro is an 
ATmega328, with a 6-pin ICSP header. The ATmega8U2 on the Uno is a 
co-processor used for USB apps, with its own separate 6-pin ICSP header.)

Thanks very much,
Henry