Re: [PATCH] ARM: Fix relocation if image end past uncompressed kernel end

[Tony Lindgren <tony@atomide.com>]

* Nicolas Pitre <nicolas.pitre@linaro.org> [110422 17:08]:
> On Thu, 21 Apr 2011, Tony Lindgren wrote:
> 
> > * Nicolas Pitre <nicolas.pitre@linaro.org> [110421 20:20]:
> > > I found the bugger.  The problem was a bad stack alignment.
> > 
> > .. as this patch won't solve the n900 booting problem with zImage.
> > With LZMA I'm still also getting "LZMA data is corrupt".
> 
> Hmmm......
> 
> Is it possible you have bad RAM?  In compressed/head.S, locate this 
> code:

This is happening on all n900 boards AFAIK.
 
> #ifdef CONFIG_AUTO_ZRELADDR
>                 @ determine final kernel image address
>                 mov     r4, pc
>                 and     r4, r4, #0xf8000000
>                 add     r4, r4, #TEXT_OFFSET
> #else
>                 ldr     r4, =zreladdr
> #endif
> 
> Right after that, simply override r4 with a physical address towards the 
> end of the RAM, say 8MB before end of RAM (unless your decompressed 
> kernel is larger than that).  That won't make a booting system, but at 
> least you will be able to test the decompressor when loaded at various 
> locations in memory without involving the relocation loop.

OK thanks, I'll take a look. I guess it could also be a cache flush
issue or borderline memory timings set in the bootloader.

Regards,

Tony