Hello, I think this is a "normal problem" ;-) Could it be, that you have set "External 32K SRAM" in the options dialog of ICCAVR? If you use this options, you MUST use the -ucrtnutram.o in the "Other Options" fild of ICCAVR, and NOT the -ucrtnut.o. I have the same starting problem, some times ago.. Regards, Michael