Date: Tue, 25 Mar 2003 08:16:28 +0100 (CET) From: Soeren Schmidt <sos@spider.deepcore.dk> To: The Anarcat <anarcat@anarcat.ath.cx> 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: <200303250716.h2P7GSXe047117@spider.deepcore.dk> In-Reply-To: <20030324195958.GB681@lenny.anarcat.ath.cx>
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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 :) -Søren To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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