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From: Soren Schmidt <sos@spider.deepcore.dk>
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In-Reply-To: <200308281040.15343.mistry.7@osu.edu>
To: Anish Mistry <mistry.7@osu.edu>
Date: Thu, 28 Aug 2003 16:47:56 +0200 (CEST)
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cc: freebsd-current@FreeBSD.ORG
Subject: Re: ATAng no PIO fallback?
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It seems Anish Mistry wrote:
> > > > it DMA was fixed for my CD/DVD combo drive.  I changed the
> > > > hw.ata.atapi_dma="0"
> > > > to hw.ata.atapi_dma="1" in my /boot/loader.conf.  After a reboot I tried 
> > There is no PIO fallback in ATAng (so far), if you know that your ATAPI 
> > device doesn't do DMA why on earth do you enable it ?
> > 
> Because the drive does support DMA.  I've tested to see it DMA actually works 
> in windows, PIO vs DMA while playing a DVD, and there is a big difference, 
> and I can only assume that it works.

Hmm, I didn't hear the "works in windows" bit :)

Could you mail me a dmesg from the system, that might uncover some usefull
info on if/how/why DMA can work on your HW..

-Søren