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Date: Wed, 8 Sep 2004 17:54:31 -0500
From: Tommy Reynolds <Tommy.Reynolds@MegaCoder.com>
To: linux-kernel@vger.kernel.org
Subject: Re: ISA DMA
Message-Id: <20040908175431.5872dda0.Tommy.Reynolds@MegaCoder.com>
In-Reply-To: <413F7960.8070500@drzeus.cx>
References: <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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