Problem debugging ppc kernel with DDD/GDB/BDI2000 on a custom MPC8260 board
Wolfgang Denk
wd at denx.de
Thu Oct 9 22:38:07 EST 2003
Dear Joao,
in message <DEF39A0710293E489D45B10E06645CBD0243B1A7 at dub-msx1.spectelcorp.com> you wrote:
>
> I am trying to boot the ppc kernel on a MPC8260 based custom board.
...
> One of the doubts that I have is that when I look into the system.map file, it shows that the start address is at 0xc0000000 (as shown below)
>
> c0000000 T _start
Yes, this is the correct kernel virtual address.
> To the best of my knowledge the kernel image is not relocatable, so I am wondering if this could be my problem or just one of them ...
> Should the map file be showing
>
> 00000000 T _start
No!!!
> If so, where should I change the .text address so that that happens ?
Don't change anything!
> I am also trying to debug the code from that address with gdb/BDI2000, but I am not getting very far.
> Basically I can see the program counter incrementing when I single step, but I cannot see the source even though I am trying to load the symbol table at 0x00000000 with the 'add-symbol-file vmlinux 0x00000000' gdb command, after invoking gdb from the k
> ernel base directory (where vmlinux is)
Just use the vmlinux file _without_ relocating any addresses. Make
sure to enable "MMU XLAT" and define "PTBASE" in your BDI config
file.
Best regards,
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de
"If people are good only because they fear punishment, and hope for
reward, then we are a sorry lot indeed." - Albert Einstein
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