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Xref: sserve comp.os.linux.misc:15561 comp.os.linux.development:9457 comp.os.386bsd.development:2171 comp.os.386bsd.questions:10446 comp.sys.ibm.pc.hardware.systems:3178 comp.sys.ibm.pc.hardware.storage:5837 comp.sys.ibm.pc.hardware.misc:5652 comp.periphs.scsi:20729 Path: sserve!newshost.anu.edu.au!munnari.oz.au!bunyip.cc.uq.oz.au!harbinger.cc.monash.edu.au!msuinfo!agate!howland.reston.ans.net!math.ohio-state.edu!jussieu.fr!univ-lyon1.fr!news-rocq.inria.fr!alix.inria.fr!soulard From: soulard@alix.inria.fr (Herve Soulard) Newsgroups: comp.os.linux.misc,comp.os.linux.development,comp.os.386bsd.development,comp.os.386bsd.questions,comp.sys.ibm.pc.hardware.systems,comp.sys.ibm.pc.hardware.storage,comp.sys.ibm.pc.hardware.misc,comp.periphs.scsi Subject: Re: BusLogi 445S and DMA Channel (NEW ANSWER) Date: 24 May 1994 06:57:28 GMT Organization: INRIA Lines: 22 Distribution: world Message-ID: <2rs8go$6tl@news-rocq.inria.fr> References: <2rnjgs$g1l@news-rocq.inria.fr> <2rs5i1$6tl@news-rocq.inria.fr> Reply-To: soulard@sor.inria.fr NNTP-Posting-Host: alix.inria.fr Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Keywords: scsi buslogic bt445s > Conclusion: > > It is possible to use the DMA channel by unsetting the switch 10, > but this should not be used, especially if you have more than > 16M bytes of memory. > > Bus mastering is better, so use a system that supports it. DOS, > Linux and FreeBSD work fine with Bus mastering, NetBSD-0.9 requires > DMA channel. OK, my conclusion is wrong. Bus mastering works with NetBSD-0.9. The problem was that because my Linux says that the 445S is a 1542 card, I've used the kc-aha-09.fs image to boot NetBSD. Drew Hess just points me that I can use the kc-ahbbt-09.fs image that uses the BT742A device driver. This driver actually uses bus mastering. So everything is perfect with the 445S with any system. I was just on the wrong way. herve Soulard.