Re: ppc405gpr On-Chip Memory (OCM) debugging - solving

[Gene Smith <gds at chartertn dot net>]

Gene Smith wrote, On 09/26/2004 01:10 AM:
> My OCD/JTAG vendor (Macraigor) has supplied a simple c demo program you 
> can load to a ppc405gpr using GDB and their mpDemon box. It appears to 
> work fine in insight or gdb except that when you single step (s) around 
> in the code it often skip instructions in a somewhat random way. 
> Optimization was not not used when compiling the program which is 
> running entirely in the 4k on-chip ram memory of the processor which 
> gets located using .gdbinit at 0xfc000000. Single stepping by assembly 
> instructions (si) seems to work without any skipped instructions.
>
> Any idea why I see skipped c instructions? I have tried gdb/insight 
> builds on cygwin and linux with the same result.
>
> -gene

Turns out the problem is with Macraigor mpDemon itself. After a week of 
being told "it works for us on our 405gp board" they tested it again and 
 saw the same problem. mpDemon firware fix is in the works.

-gene