...with very limited support for the ATmega2561 is available at http://www.ethernut.de/en/download/ This works with the latest ICCAVR 7.05BETA2 only. No GCC support, sorry. Check the updated page at http://www.ethernut.de/en/iccavr/ Also note, that this is all beta code. The stable version is 4.0.2. Enjoy, Harald