From owner-freebsd-small@FreeBSD.ORG  Thu Jul 21 08:05:40 2005
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Date: Thu, 21 Jul 2005 02:04:13 -0600 (MDT)
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From: Warner Losh <imp@bsdimp.com>
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Cc: freebsd-small@freebsd.org
Subject: Re: DMA disable for sandisk CF cards ?
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> I cannot find this searching the web, or searching the
> sandisk website.
> 
> Can someone point me in the right direction ?

Add 'hw.ata.ata_dma=0' to your /boot/loader.conf script.  This will
prevent FreeBSD from doing DMA to them.  If the BIOS has issues, you
have to fix it there.

*OR*

You have to get a CF <-> IDE adapter that has the two new wires on it
or retrofit the old one(s) that you have.

Warner