From: Michael Buesch <mbuesch@freenet.de>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev list <linuxppc-dev@ozlabs.org>,
bcm43xx-dev@lists.berlios.de
Subject: Re: [Bcm43xx-dev] 30 bits DMA and ppc
Date: Sun, 30 Oct 2005 09:47:21 +0100 [thread overview]
Message-ID: <200510300947.21917.mbuesch@freenet.de> (raw)
In-Reply-To: <1130645036.29054.229.camel@gaston>
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On Sunday 30 October 2005 05:03, Benjamin Herrenschmidt wrote:
[snip]
> However, the above would require arch specific hacks, and would only
> work for one card in the system (too bad if you plug a cardbus one).
[snap]
I think we should not need to modify the driver.
Drivers already set the DMA mask. As far as I can see, this mask
is currently (mostly) ignored on PPC and i386 (at least).
As far as I can see, PPC ignores it completely and i386 allocates in the
GFP_DMA region, if DMA is limited.
So I would say, it should be possible to use this mask
with some bounce buffers, as you suggested. That sounds like a good
solution to me. It's worth a try.
--
Greetings Michael.
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next prev parent reply other threads:[~2005-10-30 9:00 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-30 4:03 30 bits DMA and ppc Benjamin Herrenschmidt
2005-10-30 8:47 ` Michael Buesch [this message]
2005-10-30 17:59 ` Olof Johansson
2005-10-30 21:14 ` Benjamin Herrenschmidt
2005-10-30 21:35 ` Olof Johansson
2005-10-30 21:41 ` Benjamin Herrenschmidt
2005-10-30 22:02 ` Olof Johansson
2005-10-31 0:35 ` exception vectors Ingmar
2005-10-31 2:17 ` Benjamin Herrenschmidt
2005-10-31 2:28 ` Hollis Blanchard
2005-10-31 9:58 ` Ingmar
2005-11-01 1:46 ` Olof Johansson
2005-11-01 8:28 ` Ingmar
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