I've been searching around for a while hoping someone else has the problem I'm having. Either I'm not searching for the right thing, or its all just me (which is entirely possible). I'm just getting back into the 8051 arena using the T89C51CC02 from Atmel. I have a working circuit that I'm very confident of. I'm changing over to the SDCC compiler with the Codeblocks IDE on Windows XP. I have a series of files that I've tested out individually and all work just fine.

To keep things simple I just have a simple forever loop in main right now:

void main(void)
{
unsigned int x;

P3_4 = 0xff;

for(;;)
{
P3_4 = !P3_4;
for(x=0;x<=0xfff;x++){}
for(x=0;x<=0xfff;x++){}

}
}

This works fine with my scope and I can see the output toggling just like it should. When I start adding C files to the project and compiling, after about the 3rd file (it depends on the file, but the compiled size is about 2.5K to 3K of code), I lose all sign of life. It doesn't matter which file it is, once I seem to hit that limit, it stops working. I don't do ANYTHING to the main loop. I just add the file and compile.

I have separate files for CAN, Serial, Digital IO and a command parser, but just about all of them are just stubs right now. I'm compiling and linking with --large on all the files (at least that's what its showing).

I'm not even sure where to start looking for the problem.

Thanks for any tips, suggestions, pointers or "you big dummy's" :-).

Scott