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Newsgroups: comp.os.386bsd.questions Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!news.mira.net.au!news.netspace.net.au!serval.net.wsu.edu!netnews.nwnet.net!oracle.pnl.gov!osi-east2.es.net!lll-winken.llnl.gov!uwm.edu!cs.utexas.edu!howland.reston.ans.net!Germany.EU.net!ruhr.de!robkaos!robsch From: robsch@robkaos.ruhr.de (Robert Schien) Subject: Re: drivers for NCR53c810 and 3com 509... X-Newsreader: TIN [version 1.2 PL2] Organization: Private System, Essen, Germany Message-ID: <1995Jan23.182514.237@robkaos.ruhr.de> References: <ccs.790159245@ctdnet> <3fb5g5$7dd@ici-paris.ensta.fr> <explorer.790828108@wallaby.cc.iastate.edu> Date: Mon, 23 Jan 1995 18:25:14 GMT Lines: 21 Michael Graff (explorer@iastate.edu) wrote: : In <3fb5g5$7dd@ici-paris.ensta.fr> bouyer@ensta.fr (Manuel Bouyer) writes: : >NetBSD doesn't implement bounce buffers, but the problem of more than 16 : >meg of ram is only (i think) for isa scsi adapters. I have 32 meg of ram : >on my pentium, an i use a NE2000 and a 3c509 (both isa) whithout : > any problems. : I don't know if the 509 uses DMA, but even if it does, unless it : bypasses the on-board DMA controllers (i.e, bus-mastering) it doesn't : matter. NetBSD supports bounce buffers for things which use the : system board DMA controllers. This means you are out of luck with an AHA1542 and more than 16 MB ram (The 1542 does bus-mastering)? I tried NetBSD on my system which has 20 meg ram and got 'DMA beyound end of ISA' messages! BTW, is it possible to limit the memory seen by NetBSD? For example, when I install an old SYSV 3.2 Unix (ESIX) only 16 MB are seen, but the system works otherwise ok. Robert