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

Nicolas Pitre nicolas.pitre at linaro.org
Thu Apr 21 17:26:25 EDT 2011

On Thu, 21 Apr 2011, Nicolas Pitre wrote:

> On Thu, 21 Apr 2011, Tony Lindgren wrote:
> > Otherwise we end up overwriting ourselves. This fixes booting
> > on n900 after commit 6d7d0ae51574943bf571d269da3243257a2d15db
> > (ARM: 6750/1: improvements to compressed/head.S).
> > 
> > Signed-off-by: Tony Lindgren <tony at atomide.com>
> I don't understand why this is needed.  The copy loop is explicitly 
> copying from the end going backward exactly to cope with this 
> possibility.

I think your patch is 1) unneeded (see the copy loop code and the 
comment before it), and 2) simply hiding the real bug.

I just need to modify the code in compressed/misc.c slightly for the 
lzma decompressor to start or stop working randomly.  It seems that this 
code might be sensitive to slight displacement in memory caused by 
modifications to totally unrelated code.  I'm still trying to track this 


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