linux-kernel - Re: [RFC PATCH 4/4] ARM: Xilinx: Adding Xilinx board support

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Message-Id: <201105031235.41888.arnd@arndb.de>
Date:	Tue, 3 May 2011 12:35:41 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	"Russell King - ARM Linux" <linux@....linux.org.uk>
Cc:	linux-arm-kernel@...ts.infradead.org, johnlinn@...cast.net,
	nicolas pitre <nicolas.pitre@...aro.org>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	grant likely <grant.likely@...retlab.ca>,
	john linn <john.linn@...inx.com>
Subject: Re: [RFC PATCH 4/4] ARM: Xilinx: Adding Xilinx board support

On Tuesday 03 May 2011, Russell King - ARM Linux wrote:
> On Tue, May 03, 2011 at 09:58:14AM +0200, Arnd Bergmann wrote:
> > On Tuesday 03 May 2011 01:01:18 Russell King - ARM Linux wrote:
> > > It is preferable to use the same mapping, as it ensures that you're not
> > > going to create incompatible aliases.
> > 
> > Is aliasing a problem for MMIO mappings? I would think that you can
> > ioremap registers anywhere and as often as you want because they are
> > never cacheable.
> 
> Provided the type and sharability is identical then there is no problem.
> I wasn't referring to multiple ioremap()s of the same region - that
> should be fine as the same attributes will be used.  If you mix ioremap()
> and iotable_init() then you _could_ have problems if you don't use
> MT_DEVICE in the iotable.
> 
> What I'm basically saying is that mixing the methods of creating these
> mappings makes it much easier to get tripped up over these issues.
 
Ok, makes sense.

Thanks,

	Arnd
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