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Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!elroy.jpl.nasa.gov!decwrl!usenet.coe.montana.edu!osyjm From: osyjm@cs.montana.edu (Jaye Mathisen) Newsgroups: comp.os.386bsd.questions Subject: Re: FreeBSD reboots Date: 3 Sep 1993 19:41:09 GMT Organization: Computer Science, MSU, Bozeman MT, 59717 Lines: 28 Message-ID: <2686kl$4go@pdq.coe.montana.edu> References: <kgVr0eG00WB6BLPIIi@andrew.cmu.edu> NNTP-Posting-Host: schizo.coe.montana.edu In article <kgVr0eG00WB6BLPIIi@andrew.cmu.edu>, David Eugene Dwiggins <dd2x+@andrew.cmu.edu> wrote: >Here's the situation: > >486-66 With the HiNT Pseudo-EISA (24 bit DMA) motherboard >BusLogic 742A (33MB/s mode) >20M RAM >I'd like to think the problem is universal to all machines, but I'm >wondering if FreeBSD detects my machine is EISA based and thinks the DMA >controller is 32-bit. (nope. guess it's not really EISA.) >Anyway, is there double-buffering code in the floppy driver to handle >machines with over 16M RAM? >The machine is working great when I'm not using the floppy. The >BusLogic uses bus-mastering, so the 24bit DMA isn't a problem for it. >Is over 16M RAM "supported/supposed to work" with any machine? I think you've hit the nail on the head. More than 16MB's works fine in the EISA box I had, with a true EISA adaptec 1740 scsi card. I know the ISA boxes with 1540's can't have more than 16MB's of RAM, because of buffer allocation problems, and nobody has implemented the bounce buffer scheme yet. (As far as I know). If it's not a TRUE EISA motherboard, I think you're stuck. -- Jaye Mathisen, COE Systems Manager (406) 994-4780 410 Roberts Hall,Dept. of Computer Science Montana State University,Bozeman MT 59717 osyjm@cs.montana.edu