linux-kernel - Re: [PATCH 00/03][RFC] Reusable UIO Platform Driver

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Message-ID: <20080521074950.GA27310@linux-sh.org>
Date:	Wed, 21 May 2008 16:49:50 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Uwe Kleine-K?nig <Uwe.Kleine-Koenig@...i.com>
Cc:	Magnus Damm <magnus.damm@...il.com>,
	"Hans J. Koch" <hjk@...utronix.de>, linux-kernel@...r.kernel.org,
	gregkh@...e.de, linux-sh@...r.kernel.org
Subject: Re: [PATCH 00/03][RFC] Reusable UIO Platform Driver

On Wed, May 21, 2008 at 08:49:38AM +0200, Uwe Kleine-K?nig wrote:
> Magnus Damm wrote:
> >         Extending uio_pdrv driver with a chunk of physically
> > contiguous memory isn't a big deal though.
> I wonder how you use that memory.  Isn't it just some kind of shared
> memory?  If so, why not use normal shared memory?  Do you really need
> that?
> 
Physically contiguous memory is a real requirement, especially for DMA.
I'm not sure what's confusing about that?
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