Date: Tue, 25 Mar 2003 11:12:53 -0500 From: The Anarcat <anarcat@anarcat.ath.cx> To: Soeren Schmidt <sos@spider.deepcore.dk> Cc: Kevin Oberman <oberman@es.net>, Don <don@calis.blacksun.org>, Craig Reyenga <creyenga@connectmail.carleton.ca>, freebsd-current@FreeBSD.ORG Subject: Re: Broken DMA devices Message-ID: <20030325161253.GA600@lenny.anarcat.ath.cx> In-Reply-To: <200303250716.h2P7GSXe047117@spider.deepcore.dk> References: <20030324195958.GB681@lenny.anarcat.ath.cx> <200303250716.h2P7GSXe047117@spider.deepcore.dk>
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On Tue Mar 25, 2003 at 08:16:28AM +0100, Soeren Schmidt wrote:
> It seems The Anarcat wrote:
> > > hw.ata.atapi_dma="1" # Run the CD-ROM/DVD in DMA mode
> > > to /boot/loader.conf.
> > >
> > > This should be in almost EVERY /boot/loader.conf. The default is 0 (PIO)
> > > because DMA is broken on at least a few early CD readers, but it is
> > > very rare to have it fail. (I've never seen it.)
> >
> > Can't the ata drivers detect that condition or recognize the set of
> > drives that are broken instead of penalizing everyone else?
>
> ATAPI DMA is more likely to be broken than to be working, it is a
> function of both controller chip and device, in some situations even
> a function of what master/slave device combo we have..
>
> There is a reason that almost all OS's out there has it disabled as default :)
Thanks for those precisions... This could be a FAQ, pertaining also to
how to enable it.
So it's enabled system-wide? Can't it be done at the bus or device
level?
A.
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