Date: Mon, 9 Dec 2002 11:34:57 +0100 (CET) From: Soeren Schmidt <sos@spider.deepcore.dk> To: Vadim Belman <voland@lflat.org> Cc: Bruce Cran <bruce@cran.org.uk>, current@FreeBSD.ORG Subject: Re: ATACD issues slowly coming back... Message-ID: <200212091034.gB9AYvp2099124@spider.deepcore.dk> In-Reply-To: <3DF4689F.5040702@lflat.org>
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It seems Vadim Belman wrote: > > > Bruce Cran wrote: > > > Your CD drive should indeed support UDMA33 - my DVD drive supports > > UDMA33, and my CDRW supports multi-word DMA, even though my BIOS only > > ever configures it for PIO4, and my DVD for UDMA33. FreeBSD only ever > > configures them for PIO during bootup, but, using the atacontrol > > program, it configures them both for maximum speed, even knowing they > > _can_ only do UDMA33,WDMA2. > > If you have a look at sysctl hw.ata tree, it'll give you the clue on > how to overcome this behaviuor. In simple words, what you need is to poot > > hw.ata.atapi_dma=1 > > in your /boot/loader.conf and have the nirvana of automatic DMA > detection... And remember the warning that it does not always work as expected, ATAPI DMA is a many headed monster... -Søren To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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