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To: Ben Greear <greearb@candelatech.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: How to disable DMA for compact-flash disk?
References: <4A81BDA6.4080804@candelatech.com>
From: Krzysztof Halasa <khc@pm.waw.pl>
Date: Tue, 11 Aug 2009 22:24:42 +0200
In-Reply-To: <4A81BDA6.4080804@candelatech.com> (Ben Greear's message of "Tue\, 11 Aug 2009 11\:51\:18 -0700")
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Ben Greear <greearb@candelatech.com> writes:

> I'm trying to use Fedora 11 with default kernel on an old via system
> that boots from compact flash.  DMA is not supported on the CF for
> whatever reason,

BTW if you are using a PATA-CF adapter... perhaps the DMA request and
ack lines are not connected. Newer adapters may have them.

A similar issue is 80-wire cable detection (DMA-66+). Adapters plugged
directly into the PATA connector (no cable) need to connect one of the
lines to GND. Never seen an adapter with this connection.

Both issues can be easily fixed in hardware. DMA-66+ can also be forced
in software.
-- 
Krzysztof Halasa