Date: Thu, 09 Sep 2004 16:54:05 +0200 From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@DeepCore.dk> To: Mark Daniel Reidel <changethis@mark.reidel.info> Cc: current@freebsd.org Subject: Re: DMA-aware drive runs at PIO since upgrading to 5.3beta Message-ID: <41406E8D.9040801@DeepCore.dk> In-Reply-To: <413FE07E.2070302@mark.reidel.info> References: <413FE07E.2070302@mark.reidel.info>
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Mark Daniel Reidel wrote: > Hi there! >=20 > Since I upgraded from a current as of end of July to 5.3 beta2, I=20 > noticed, that by CDRW now runs on PIO4 which is quite annoying, since i= t=20 > was running on WDMA perfectly well before :o( My other drive, a DVD is = > detected fine, here's the dmesg snip: > Any idea why it's doing this? My other PC at work has a CDROM which is = > also now run on PIO4 instead of DMA since the upgrade, so I guess it's = > nothing specific to my hardware since I have an Athlon and a P4 at work= =2E > Any help would be appreciated, because burning at PIO4 is not what I'd = > like to to from now on as you can imagine ;o) We have changed the default to be DMA enabled on ATAPI devices. However=20 for that to have a chance to work I changed the logic so we only enable=20 DMA on UDMA33 capable ATAPI devices. This is because *lots* of old ATAPI = device claim DMA but cant, only ollowing UDMA33 sorts out most if not=20 all those buggy devices. Now if you want DMA on your drive, just use atacontrol to set the mode=20 you want. -S=F8ren
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