From: Tommy Reynolds <Tommy.Reynolds@MegaCoder.com>
To: linux-kernel@vger.kernel.org
Subject: Re: ISA DMA
Date: Wed, 8 Sep 2004 17:54:31 -0500 [thread overview]
Message-ID: <20040908175431.5872dda0.Tommy.Reynolds@MegaCoder.com> (raw)
In-Reply-To: <413F7960.8070500@drzeus.cx>
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Uttered Pierre Ossman <drzeus-list@drzeus.cx>, spake thus:
> I've been trying to figure out how other drivers do it but I can't see
> what I'm missing. And the documentation doesn't cover ISA DMA.
Allocate your DMA buffer area by OR'ing in the "GFP_DMA" flag. This
keeps your DMA buffer below the magical 16MB limit. Also be sure to
use "virt_to_bus()" to convert the kernel buffer address into one
that you can give to the DMA engine.
HTH.
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next prev parent reply other threads:[~2004-09-08 22:55 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-08 21:28 ISA DMA Pierre Ossman
2004-09-08 22:27 ` Alan Cox
2004-09-09 15:14 ` Pierre Ossman
2004-09-08 22:54 ` Tommy Reynolds [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-12-20 16:42 Michael Sokolov
2001-12-19 10:21 Adrian Cox
2001-12-20 8:36 ` David Müller (ELSOFT AG)
2001-12-20 9:50 ` Adrian Cox
2001-12-20 10:09 ` Geert Uytterhoeven
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