Linux boot on a ppc 405

[David Baird]

On Jan 27, 2008 9:20 AM, Ricardo Severo <severo.ricardo at gmail.com> wrote:
> Hi all,
>
> I am working with a Xilinx Virtex II Pro  evaluation board, wich has two
> PowerPC 405 and I'm trying to boot a vanilla linux kernel 2.6.23.14.
> Until now I've manged to make it uncompress the kernel, but it doesn't boot.
> My question is how the initial execution (the one who uncompresses the
> kernel image) transfers the processor to the kernel itself. I've looked
> in the arch/ppc/boot/simple/relocate.S code and it jumps to the position
> 0x0 after uncompressing, is it right? The kernel is uncompressed at that
> position?
>
> Thanks,

It should branch to the beginning of arch/ppc/kernel/head_4xx.S, which
I think was 0x0.

Some things to check are:

- Comment/remove the weak embed_config in arch/ppc/boot/simple/misc-embedded.c
- Did you use ttyUL0 or ttyS0 as your console?

If that fails, you can use XMD to set a breakpoint at 0x0 and then
read the memory to see if it matches up with an objdump of vmlinux.