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Xref: sserve comp.os.386bsd.questions:17524 comp.unix.bsd.freebsd.misc:1194 Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!bunyip.cc.uq.oz.au!munnari.oz.au!spool.mu.edu!uwm.edu!cs.utexas.edu!howland.reston.ans.net!Germany.EU.net!Dortmund.Germany.EU.net!nntp.gmd.de!news.rwth-aachen.de!news.rhrz.uni-bonn.de!RRZ.Uni-Koeln.DE!se From: se@MI.Uni-Koeln.DE (Stefan Esser) Newsgroups: comp.os.386bsd.questions,comp.unix.bsd.freebsd.misc Subject: Re: External cache prevents booting? (was: FreeBSD 2.0 Boot Floppy Date: 18 May 1995 11:07:55 GMT Organization: Institute for Mathematics, University of Cologne, Germany Lines: 31 Message-ID: <3pf9qb$6jr@news.rrz.uni-koeln.de> References: <3lvemo$eu8@kiwi.cssc-syd.tansu.com.au> <3n6f4p$4rr@klaava.helsinki.fi> <3o3ijd$3p6@park.uvsc.edu> <3o4l27$arn@nntp1.u.washington.edu> <3o8fj1$aas@helena.MT.net> <3pcsf8$toq@jeeves.niehs.nih.gov> NNTP-Posting-Host: fileserv1.mi.uni-koeln.de In article <3pcsf8$toq@jeeves.niehs.nih.gov>, duling@niehs.nih.gov (Dave Duling) writes: |> >That's a big suprise to me considering that the 53cx7XX series of chips |> >don't do bus-mastering. And, I'm *positive* that the NCR 53cx810 |> >controller I installed wasn't doing bus-mastering even though it worked |> >under DOS. The reason I know is because it wouldn't work correctly |> >under OS/2 and FreeBSD because of a buggy BIOS which caused it to never |> >responds to interrupts. |> > |> >However, it was pretty darn fast considering it was running in PIO mode. |> >The author of the FreeBSD driver showed me a way to run the card in PIO mode |> >under FreeBSD, and I was getting 2.4MB/sec out of the drive. |> > |> |> Hey, no fair. Could you pass this information on to the rest of us. What for ? Running the NCR 53c8xx controllers as PIO mode devices would be a really silly thing to do. They get over 8MB/s in DMA mode out of a single modern FAST SCSI drive. The PIO mode of this chip is only useful for testing purposes. Regards, STefan -- Stefan Esser Internet: <se@ZPR.Uni-Koeln.DE> Zentrum fuer Paralleles Rechnen Tel: +49 221 4706017 Universitaet zu Koeln FAX: +49 221 4705160 Weyertal 80 50931 Koeln