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

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Message-ID: <20080521085033.GA29607@digi.com>
Date:	Wed, 21 May 2008 10:50:33 +0200
From:	Uwe Kleine-König <Uwe.Kleine-Koenig@...i.com>
To:	Magnus Damm <magnus.damm@...il.com>
CC:	Paul Mundt <lethal@...ux-sh.org>,
	"Hans J. Koch" <hjk@...utronix.de>, <linux-kernel@...r.kernel.org>,
	<gregkh@...e.de>, <linux-sh@...r.kernel.org>,
	Katsuya MATSUBARA <matsu@...l.co.jp>
Subject: Re: [PATCH 00/03][RFC] Reusable UIO Platform Driver

Hello,

Magnus Damm wrote:
> On Wed, May 21, 2008 at 5:05 PM, Uwe Kleine-König
> <Uwe.Kleine-Koenig@...i.com> wrote:
> > @Magnus: Maybe you can provide the userspace part of the driver?
> > How is that mapping used there?
> 
> [Added Matsubara-san as CC]
> 
> Sure, here is a little test program. Have a look at "uio_mem". The
> "address" member contains the physical address that can be used for
> bus mastering DMA. Compare that to "iomem" which is the pointer to the
> virtual memory area in user space.
> 
> Hope this helps!
Yes it does.  I thought the physical address is stored in internal_addr
and the virtual in addr, but it's the other way round.  Thanks.

Best regards
Uwe

-- 
Uwe Kleine-König, Software Engineer
Digi International GmbH Branch Breisach, Küferstrasse 8, 79206 Breisach, Germany
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