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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.mel.connect.com.au!news.syd.connect.com.au!news.bri.connect.com.au!fjholden.OntheNet.com.au!corolla.OntheNet.com.au!not-for-mail From: Tony Griffiths <tonyg@OntheNet.com.au> Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: Are bounce buffers needed for pci Date: Tue, 29 Apr 1997 16:57:44 +1000 Organization: On the Net (ISP on the Gold Coast, Australia) Lines: 12 Message-ID: <33659BE8.7B7A@OntheNet.com.au> References: <5jvgrl$885$1@csnews.cs.colorado.edu> Reply-To: tonyg@OntheNet.com.au NNTP-Posting-Host: swanee.nt.com.au Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.0 (WinNT; I) To: Alan T Krantz <atk@alumni.cs.Colorado.EDU> Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:39896 Alan T Krantz wrote: > > Are bounce buffers needed for the PCI bus ? The documentation (freebsd > handbook) indicated that they are needed for ISA bus but ... Only for ISA-bus devices that do DMA (Direct Memory Access). The PCI [32-bit] bus doesn't have the 16MB limitation of the ISA bus. Btw, not all ISA bus cards do DMA, most do only programmed I/O so unless you have a SCSI card you can remove B-B support from the kernel. Tony