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Newsgroups: comp.os.386bsd.bugs Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!msuinfo!agate!howland.reston.ans.net!swrinde!news.dell.com!tadpole.com!uunet!seas.smu.edu!rwsys!hammy!gordon From: gordon@sneaky.lonestar.org (Gordon Burditt) Subject: Re: FreeBSD, fd0d: hard error Organization: /usr/lib/news/organi[sz]ation Message-ID: <CwCMrD.4p8@sneaky.lonestar.org> References: <33j9hp$41l@sol.sun.csd.unb.ca> <34a91e$h2f@sol.sun.csd.unb.ca> <34iv96$ik4@pdq.coe.montana.edu> <34lk6g$d44@orion.cc.andrews.edu> Date: Sun, 18 Sep 1994 23:33:12 GMT Lines: 24 >Hmm, could be, I'd like to blame it on the drivers though.. :-) >I just swapped an IDE controller out for a AHA1542B and I'm getting >wads-o-errors on the floppy. I'm going to swap back to the IDE just >to see if it was that or the new kernel. Note that I'm using NetBSD >v1.0_beta. (yeah, one *them* :-) ) I'd like to believe my adaptec, >my buslogic, my floppy drives, and several of my floppies, are good! Adaptec's EZ-SCSI manuals note that the default bus-on and bus-off times on the AHA1542-whatever are long enough to interfere with floppy or floppy-tape I/O due to DMA starvation. I'd expect that the error codes would reflect DMA underrun (writes) or overrun (reads), which I'm not seeing in the posts, but maybe there is a problem with error reporting or retry logic. Questions to those experiencing the problem: is a SCSI controller, especially an AHA1[57]4[02][ABC] also doing I/O at the same time as the floppy? (e.g. you're copying to/from your SCSI hard disk, or paging in a program from it). Changes to the driver's handling of the bus speed setting might be the difference that makes the problem show up more often. Gordon L. Burditt sneaky.lonestar.org!gordon