Re: Gdb with MPC85xx

On Fri, 3 Feb 2006, Fahd Abidi wrote:

Hello,

I am wondering if someone here is using GDB to debug code on an 85xx
platform with the BDI. I have been running into several issues with GDB
5.x and 6.x where the E500 core does not seem to either step properly to
the next line of code in the kernel or uboot or gets lost altogether.
Each version of GDB seems to have its own set of bugs. If someone has
been using a version of GDB that works pretty well then let me know what
version it is and I can try and download it and build it and see if it
behaves better.

Are you able to get the registers in GDB properly?  The e500 introduces a 
different GDB register protocol than standard PPC.  This either requires 
the latest GDB and possibly BDI firmware.  I forget how BDI handles the 
different protocol layouts.  I'm pretty sure they added support for "full 
e500 GDB" recently.

You also, have to build u-boot and your kernel to handle the quicky debug 
support on 85xx.

- kumar