Date: Fri, 25 Aug 2000 21:56:56 -0700 (PDT) From: Doug White <dwhite@resnet.uoregon.edu> To: Jamie Hermans <freebsd@hermans.ab.ca> Cc: hackers@FreeBSD.ORG Subject: Re: Auto DMA vs. Manual DMA Settings... FBSD 3.51 Message-ID: <Pine.BSF.4.21.0008252154450.24063-100000@resnet.uoregon.edu> In-Reply-To: <001001c00efd$1a5840c0$641ba8c0@hermans.ab.ca>
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On Fri, 25 Aug 2000, Jamie Hermans wrote: > I am having an issue with the wd driver (from FBSD 3.51). Once a customer > kernel (having the flags 0xa0ffa0ff for wd) is booted, I get screen-full's > of this error message when there is any hard drive access: > > DMA failure, DMA status 5<active> > > I can "slow down" or degrade my DMA settings in the BIOS to avoid this > message, but I'm sure I am taking a performance penalty in doing this. It may be that: a) your cable is damaged; b) your system is too noisy; c) your disks proclaim UDMA capability but can't actually deliver it. > http://www.freebsd.org/cgi/mid.cgi?db=mid&id=19991220124638.B37447@web.net > > ... where this was covered back in December 1999 - I had hoped that this > would have been resolved by now. > > System hardware - Maxtor UDMA66 drive, motherboard only supports UDMA33 > however, so that's not really an issue. I'd suggest upgrading to a proper DMA66 cable and see if that helps. > My question ... can I use the ad driver from 4.x with 3.51-RELEASE? This > problem doesn't occur under 4.0 or 4.1-RELEASE/STABLE. If this is possible > ... how? No, the ata driver is not available on 3.X. Doug White | FreeBSD: The Power to Serve dwhite@resnet.uoregon.edu | www.FreeBSD.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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