linux-kernel - Re: [PATCH] ARM: avoid mis-detecting some V7 cores in the decompressor

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Date:	Thu, 6 Jun 2013 00:21:43 -0400 (EDT)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Brian Swetland <swetland@...gle.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] ARM: avoid mis-detecting some V7 cores in the
 decompressor

On Wed, 5 Jun 2013, Stephen Boyd wrote:

> On 06/04, Nicolas Pitre wrote:
> > 
> > The LC0 area should be considered read-only as it may be located in 
> > flash.
> > 
> > Here's what I came with instead:
> > 
> > From: Nicolas Pitre <nicolas.pitre@...aro.org>
> > Date: Tue, 4 Jun 2013 17:01:30 -0400
> > Subject: [PATCH] ARM: zImage: don't overwrite ourself with a page table
> > 
> > When zImage is loaded into RAM at a low address but TEXT_OFFSET
> > is set higher, we risk overwriting ourself with the page table
> > needed to turn on the cache as it is located relative to the relocation
> > address.  Let's defer the cache setup after relocation in that case.
> > 
> > Signed-off-by: Nicolas Pitre <nico@...aro.org>
> 
> Reported-by: Stephen Boyd <sboyd@...eurora.org>
> Tested-by: Stephen Boyd <sboyd@...eurora.org>
> 
> This one passes testing on my two platforms with and without the
> 2Mb reservation at the beginning of ram. Seems like a good enough
> compromise for me.

Good!  Queued here:

http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=7751/1


Nicolas
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