Linux boot on a ppc 405

Grant Likely grant.likely at
Mon Jan 28 08:15:56 EST 2008

On 1/27/08, Ricardo Severo <severo.ricardo at> 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
> 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?

Post your output log please.

If your getting a message that the kernel is uncompressing, but you
don't have any output beyond that then most likely your console is not
setup correctly.  If you've got a debugger, look at memory at the
__log_buf location to see if there are any boot logs there.


Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.

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