linux-kernel - Re: [PATCHv4 1/2] ARM: Set proper TEXT

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Message-ID: <20110811211106.GA14101@huya.qualcomm.com>
Date:	Thu, 11 Aug 2011 14:11:06 -0700
From:	David Brown <davidb@...eaurora.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	David Brown <davidb@...eaurora.org>,
	Nicolas Pitre <nicolas.pitre@...aro.org>
Subject: Re: [PATCHv4 1/2] ARM: Set proper TEXT_OFFSET for newer MSMs

On Wed, Jul 27, 2011 at 12:19:14PM -0700, Stephen Boyd wrote:
> MSMs post 8x50 have 2Mb at the beginning of RAM reserved for
> shared memory. Since the kernel hasn't typically been told this
> RAM exists, PHYS_OFFSET has been set to 0xN0200000 and the memory
> atags passed to the kernel have matched. This doesn't play nicely
> with things such as AUTO_ZRELADDR, which doesn't work at all, and
> dynamic phys to virt, which requires an MSM specific workaround.
> 
> Work around these issues by telling the kernel RAM starts at
> 0xN0000000 (it actually does) and fixup the atags from the
> bootloader (if necessary) to say the same. In addition, make sure
> to set TEXT_OFFSET at least 2Mb beyond the start of RAM so that
> the kernel doesn't end up being decompressed into shared memory.
> 
> After doing this, AUTO_ZRELADDR should work on MSM with no
> problems and ARM_PATCH_PHYS_VIRT_16BIT should no longer be
> necessary.
> 
> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
> Acked-by: Nicolas Pitre <nicolas.pitre@...aro.org>
> ---

Acked-by: David Brown <davidb@...eaurora.org>

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