Ben Warren wrote:
> I don't know how well supported your CPU is (I've never heard of it, but
> that's not saying much) Anyway, I've debugged ROM on a couple of
> different MPC8349s, but not with 100% success. I can single-step with
> the BDI, and can single-step assembly code, but not C code using gdb.
I don't know about PowerPC processors, but on x86, single-stepping assembly code is completely different from single-stepping C code. With assembly, the debugger typically enables instruction interrupts, where an interrupt is generated after each instruction is executed. This does not require modifying memory.
With C code, a single line of C code is usually multiple assembly instructions, so the debugger (gdb in this case) places a breakpoint at the appropriate spot.
That's some good insight, and would certainly explain my problem. Thanks!