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Xref: sserve comp.periphs.scsi:20701 comp.os.linux.misc:15493 comp.os.386bsd.questions:10433 comp.sys.ibm.pc.hardware.storage:5811 Newsgroups: comp.periphs.scsi,comp.os.linux.misc,comp.os.386bsd.questions,comp.sys.ibm.pc.hardware.storage Path: sserve!newshost.anu.edu.au!munnari.oz.au!bunyip.cc.uq.oz.au!harbinger.cc.monash.edu.au!msuinfo!agate!ihnp4.ucsd.edu!library.ucla.edu!csulb.edu!csus.edu!netcom.com!netcomsv!raw!iverson From: iverson@lionheart.com (Tim Iverson) Subject: Re: BusLogi 445S and DMA Channel Keywords: scsi buslogic bt445s References: <2rnjgs$g1l@news-rocq.inria.fr> Followup-To: comp.periphs.scsi Organization: Lionheart Software Date: Mon, 23 May 1994 23:06:25 GMT Message-ID: <CqA2uq.84G@lionheart.com> Lines: 42 In article <2rnjgs$g1l@news-rocq.inria.fr>, Herve Soulard <soulard@sor.inria.fr> wrote: > >I've just bought a BusLogic BT445S and I've a problem with the >DMA channel. When I load the BusLogic DOS Manager, it reports that >no DMA channel is used. The same thing is reported by the NetBSD This is not only normal, it is the preferred method. The BT445s can run either as an ISA bus-master (thus requiring a DMA channel to negotiate for the bus) or as a VLB bus-master. Since your BT445 is not using a DMA channel, it is using the more desirable VLB bus-mastering and not the ISA method. Some earlier 445s used ISA by default to get around a potential bug in the VLB mastering. This has since been fixed, and now VLB is the default. >Does somebody know how to solve this problem ? If you really want to run slower, you can (according to rumor) change SW2-10 from the default. > Orchid SuperBoard 486 DX2/66 VLB > 20 Mbytes of RAM This is the only really critical info ... if you switch to ISA DMA, your BT445 will not be able to access anything beyond 16MB. >The SCSI card works fine with DOS and with Linux 1.1.11. The >only problem is that the DMA channel is not set. ... >So what is wrong ? Nothing is wrong. Except ... well, you did cross-post this to just about every newsgroup in creation (hrmph! how rude. ;-). Followups have been redirected to comp.periphs.scsi. - Tim Iverson iverson@lionheart.com -- "Deserve's got nothin' to do with it." - William Muney (Clint Eastwood, Unforgiven)