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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
Cc: <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] 2.5.24 IDE 97
Date: Thu, 4 Jul 2002 19:51:25 +0200
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>My tuning scheme satisfies your both demands, by ch->dma_base,
>ch->autodma and ch->modes_map host informs generic code about its
>capabilities.

Just keep in mind that some chipsets don't use dma_base
but still can do DMA (typically ide-pmac, and some embedded
controllers). They do DMA their own way, not using the PRD
tables. Actually, I would love beeing able to use that same
dma_base (and others) fields for my own stuffs, but the common
layer, last I looked at it, still does assumptions that when
those are filled, they match a legacy controller.

Ben.


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