From: Adrian Cox <adrian@humboldt.co.uk>
To: Paul Mackerras <paulus@samba.org>
Cc: John Whitney <jwhitney-linuxppc@sands-edge.com>,
Linux/PPC Development <linuxppc-dev@lists.linuxppc.org>
Subject: Re: Problems with dma_alloc_coherent()
Date: Sat, 03 Apr 2004 08:33:19 +0100 [thread overview]
Message-ID: <1080977598.7999.791.camel@newt> (raw)
In-Reply-To: <16493.61242.908659.82167@cargo.ozlabs.ibm.com>
On Fri, 2004-04-02 at 23:54, Paul Mackerras wrote:
> If you want to write code to handle a separate DMA controller, go
> ahead. You will need to design your own separate API for it. I
> wouldn't try to make it too general, though, since there are very few
> systems these days that have DMA controllers (as distinct from
> bus-master capable I/O devices).
Actually, they are extremely common in the embedded market. On my desk I
have three Linux systems with this class of DMA engine: an MPC107/7410,
an ARM9 from Cirrus, and an ARM9 from TI. Most system-on-a-chip
processors have DMA engines which can move between any two of memory,
PCI, and internal peripherals.
- Adrian Cox
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2004-04-03 7:33 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-01 15:59 Problems with dma_alloc_coherent() John Whitney
2004-04-01 16:30 ` John Whitney
2004-04-01 16:51 ` Dan Malek
2004-04-01 17:01 ` Tom Rini
2004-04-01 17:05 ` Matt Porter
2004-04-01 17:51 ` John Whitney
2004-04-01 18:16 ` Matt Porter
2004-04-01 18:19 ` Eugene Surovegin
2004-04-01 18:33 ` Eugene Surovegin
2004-04-01 18:33 ` John Whitney
2004-04-01 18:40 ` Eugene Surovegin
2004-04-01 18:48 ` John Whitney
2004-04-01 18:55 ` Dan Malek
2004-04-01 18:59 ` Eugene Surovegin
2004-04-01 19:10 ` John Whitney
2004-04-01 19:17 ` Eugene Surovegin
2004-04-01 19:35 ` John Whitney
2004-04-01 20:52 ` Michael R. Zucca
2004-04-01 22:00 ` Eugene Surovegin
2004-04-01 22:39 ` Michael R. Zucca
2004-04-02 16:50 ` John Whitney
2004-04-02 18:50 ` Michael R. Zucca
2004-04-02 19:27 ` John Whitney
2004-04-02 20:20 ` Michael R. Zucca
2004-04-02 21:01 ` John Whitney
2004-04-03 7:54 ` Adrian Cox
2004-04-03 12:43 ` John Whitney
2004-04-05 9:05 ` Adrian Cox
2004-04-03 17:33 ` Brad Boyer
2004-04-03 23:17 ` Paul Mackerras
2004-04-04 8:15 ` Adrian Cox
2004-04-02 22:54 ` Paul Mackerras
2004-04-03 7:33 ` Adrian Cox [this message]
2004-04-04 22:56 ` Benjamin Herrenschmidt
2004-04-02 5:45 ` Christoph Hellwig
2004-04-01 20:49 ` Matt Porter
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