[U-Boot-Users] debug u-boot using bdi2000

[Timur Tabi]

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.

-- 
Timur Tabi
Linux Kernel Developer @ Freescale