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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!paladin.american.edu!zombie.ncsc.mil!newsgate.duke.edu!news.mathworks.com!nntp.primenet.com!enews.sgi.com!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!news.webspan.net!usenet From: "Jordan K. Hubbard" <jkh@FreeBSD.org> Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: FBSD and EISA machines Date: Thu, 26 Sep 1996 15:50:30 -0700 Organization: Walnut Creek CDROM Lines: 18 Message-ID: <324B08B6.695678E2@FreeBSD.org> References: <324ac5e5.4422121@news.tiac.net> NNTP-Posting-Host: time.cdrom.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.0 (X11; I; FreeBSD 2.2-CURRENT i386) To: tarbet@swaa.com Margaret Tarbet wrote: > I think that not-so-long-ago i started to read a discussion, or > maybe it was only a contention, that FBSD doesn't really take > advantage of EISA address space; that anything over 16Mb > is just as useless as under DOS. I wish i could go back and Not true on several counts: 1. We can and do talk to EISA cards in the EISA address space. 2. The 24 bit DMA address limitation only applies to ISA cards. 3. Even with ISA cards, we support "bounce buffering" so that DMA buffers are all allocated in < 16MB memory (that's just for DMA, you can still access any other region of memory for the copy in/out). P.S. That's an inhumanely long signature you have there. :) -- - Jordan Hubbard President, FreeBSD Project