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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!news.rmit.EDU.AU!news.unimelb.EDU.AU!munnari.OZ.AU!news.ecn.uoknor.edu!news.wildstar.net!news.ececs.uc.edu!news.kei.com!newsfeed.internetmci.com!feed1.news.erols.com!uunet!news-in2.uu.net!EU.net!main.Germany.EU.net!fu-berlin.de!irz401!orion.sax.de!uriah.heep!news From: j@uriah.heep.sax.de (J Wunsch) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: need help accessing device i/o memory from device driver Date: 11 Oct 1996 08:45:03 GMT Organization: Private BSD site, Dresden Lines: 21 Message-ID: <53l1ef$4ia@uriah.heep.sax.de> References: <325b02fd.1625642@news.ma.ultranet.com> Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) NNTP-Posting-Host: localhost.heep.sax.de Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Newsreader: knews 0.9.6 X-Phone: +49-351-2012 669 X-PGP-Fingerprint: DC 47 E6 E4 FF A6 E9 8F 93 21 E0 7D F9 12 D6 4E moncrg@ultranet.com (Gregory D. Moncreaff) wrote: > I'm working on a device driver for a serial board under Freebsd. I > did a hack and slash on a similar driver that used the same serial > chips as the board I'm working with. The only difference is that the > new board has a dual-port ram and the old board/driver didn't. > > What I don't understand is how you "wire" pages of, virtual I guess, > memory to a physical location. Is your memory located in the ``ISA hole'', or somewhere in the upper memory? The ISA hole is already mapped. For the upper memory area, you could perhaps adopt the algorithm used in the /dev/mem implementation. -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)