Hi - On Tue, May 24, 2005 at 12:26:48PM +0530, Shilin Shakti wrote: > [...] > following message: > "2 byte write to unmapped address 0xfffffffe at 0x404",=20 > while the similar m32r program runs fine. At 0x404 is a move immediate da > ta instruction in my case (but how this 0xfffffffe address i'm confused!! > ). You could run the simulator under gdb, and put a breakpoint at the point in the generated sem.c file which executes that move-immediate instruction. Without posting more information, such as your modified .cpu file and disassembled sample program, we won't be able to help much. - FChE