From: Paul Mundt <lethal@linux-sh.org>
To: Uwe Kleine-K?nig <Uwe.Kleine-Koenig@digi.com>
Cc: Magnus Damm <magnus.damm@gmail.com>,
"Hans J. Koch" <hjk@linutronix.de>,
linux-kernel@vger.kernel.org, gregkh@suse.de,
linux-sh@vger.kernel.org
Subject: Re: [PATCH 00/03][RFC] Reusable UIO Platform Driver
Date: Wed, 21 May 2008 07:49:50 +0000 [thread overview]
Message-ID: <20080521074950.GA27310@linux-sh.org> (raw)
In-Reply-To: <20080521064938.GA11580@digi.com>
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?
WARNING: multiple messages have this Message-ID (diff)
From: Paul Mundt <lethal@linux-sh.org>
To: Uwe Kleine-K?nig <Uwe.Kleine-Koenig@digi.com>
Cc: Magnus Damm <magnus.damm@gmail.com>,
"Hans J. Koch" <hjk@linutronix.de>,
linux-kernel@vger.kernel.org, gregkh@suse.de,
linux-sh@vger.kernel.org
Subject: Re: [PATCH 00/03][RFC] Reusable UIO Platform Driver
Date: Wed, 21 May 2008 16:49:50 +0900 [thread overview]
Message-ID: <20080521074950.GA27310@linux-sh.org> (raw)
In-Reply-To: <20080521064938.GA11580@digi.com>
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?
next prev parent reply other threads:[~2008-05-21 7:49 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-20 10:51 [PATCH 00/03][RFC] Reusable UIO Platform Driver Magnus Damm
2008-05-20 10:51 ` Magnus Damm
2008-05-20 10:51 ` [PATCH 01/03] uio: Add enable_irq() callback Magnus Damm
2008-05-20 10:51 ` Magnus Damm
2008-05-21 11:58 ` Magnus Damm
2008-05-21 11:58 ` Magnus Damm
2008-05-22 20:18 ` Hans J. Koch
2008-05-22 20:18 ` Hans J. Koch
2008-05-23 1:24 ` Magnus Damm
2008-05-23 1:24 ` Magnus Damm
2008-05-23 8:43 ` Hans J. Koch
2008-05-23 8:43 ` Hans J. Koch
2008-05-20 10:51 ` [PATCH 02/03] uio: Add uio_platform driver Magnus Damm
2008-05-20 10:51 ` Magnus Damm
2008-05-20 10:51 ` [PATCH 03/03] sh: Export sh7343/sh7722/sh7723 VPU/VEU blocks Magnus Damm
2008-05-20 10:51 ` Magnus Damm
2008-05-20 21:07 ` [PATCH 00/03][RFC] Reusable UIO Platform Driver Hans J. Koch
2008-05-20 21:07 ` Hans J. Koch
2008-05-21 3:31 ` Magnus Damm
2008-05-21 3:31 ` Magnus Damm
2008-05-21 6:49 ` Uwe Kleine-König
2008-05-21 6:49 ` Uwe Kleine-König
2008-05-21 7:49 ` Paul Mundt [this message]
2008-05-21 7:49 ` Paul Mundt
2008-05-21 8:05 ` Uwe Kleine-König
2008-05-21 8:05 ` Uwe Kleine-König
2008-05-21 8:22 ` Magnus Damm
2008-05-21 8:22 ` Magnus Damm
2008-05-21 8:50 ` Uwe Kleine-König
2008-05-21 8:50 ` Uwe Kleine-König
2008-05-21 8:09 ` Magnus Damm
2008-05-21 8:09 ` Magnus Damm
2008-05-21 9:25 ` Uwe Kleine-König
2008-05-21 9:25 ` Uwe Kleine-König
2008-05-21 10:50 ` Magnus Damm
2008-05-21 10:50 ` Magnus Damm
2008-05-21 11:04 ` Uwe Kleine-König
2008-05-21 11:04 ` Uwe Kleine-König
2008-05-21 11:56 ` Magnus Damm
2008-05-21 11:56 ` Magnus Damm
2008-05-21 12:09 ` Uwe Kleine-König
2008-05-21 12:09 ` Uwe Kleine-König
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