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Subject: Re: ISA DMA
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Pierre Ossman <drzeus-list@drzeus.cx>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Date: Wed, 08 Sep 2004 23:27:15 +0100
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On Mer, 2004-09-08 at 22:28, Pierre Ossman wrote:
> I'm trying to figure out how to do ISA DMA transfers. I can't figure out 
>   how to satisfy all the requirements the ISA DMA controller sets. I've 
> set a DMA mask of 0x00ffffff but mappings end up above the 16MB limit 
> nonetheless. And I have no idea how to keep transfers within the same 
> 64k boundary.

drivers/net/lance.c is a pretty good worked example of driving the old
ISA bus grunge.