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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.ecn.uoknor.edu!solace!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!swrinde.nde.swri.edu!news.uh.edu!lurch.sccsi.com!news.sccsi.com!nuchat!not-for-mail From: gclarkii@main.gbdata.com (Gary Clark II) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: BOUNCE BUFFERS AND BUSLOGIC ISA CONTROLLER Date: 15 Sep 1996 16:33:15 -0500 Organization: GB Data Systems (ISP, ICP and FreeBSD consulting) Lines: 23 Message-ID: <51hsmr$170@main.gbdata.com> References: <323735BE.41C67EA6@mindspring.com> <51enth$t3q@symiserver2.symantec.com> NNTP-Posting-Host: main.gbdata.com Panics on a 486 with 32MB and a 545 SCSI card. >There were a few comments in the buslogic device driver about that series of cards >not being able to DMA on > 16MB machines. While I'm sure that this probably has >been fixed by now, I'd try removing 16MB or ram from your machine and running >the tape drive for a testing period of time to see of the panics stop. The fix for DMA > 16MB is to add 'option BOUNCE_BUFFERS' to the kernel config file, recompile, reinstall and reboot. By nature DMA > 16MB on the ISA buss is broken. This should fix the problem. If not, then there are other ones than just the DMA problem to found. Hope it helps, Gary -- Gary Clark II (N5VMF) | I speak only for myself and "maybe" my company gclarkii@GBData.COM | Member of the FreeBSD Doc Team Providing Internet and ISP startups mail info@GBData.COM for information FreeBSD FAQ at ftp://ftp.FreeBSD.ORG/pub/FreeBSD/docs/freebsd-faq.ascii