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Path: sserve!newshost.anu.edu.au!munnari.oz.au!bunyip.cc.uq.oz.au!harbinger.cc.monash.edu.au!yeshua.marcam.com!news.kei.com!sol.ctr.columbia.edu!howland.reston.ans.net!news.intercon.com!udel!news.sprintlink.net!news.clark.net!news.clark.net!not-for-mail From: ack@clark.net (Eric S. Hvozda) Newsgroups: comp.os.386bsd.questions Subject: Re: Does NetBSD support > 16 MB in VL-bus or ISA bus now? Date: 30 Jan 1994 21:13:12 -0500 Organization: Clark Internet Services, Inc. Lines: 17 Message-ID: <2ihpfo$l10@explorer.clark.net> References: <2ihnh5$ca5@mall.sinica.edu.tw> NNTP-Posting-Host: explorer.clark.net Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit In article <2ihnh5$ca5@mall.sinica.edu.tw>, 24@Yun-Yung Jen <yyjen@gate.sinica.edu.tw> wrote: > Does NetBSD support > 16 MB RAM on VL-bus or ISA bus machines now ? >Because of 24-bit DMA of ISA, does NetBSD use RAM more than 16 MB as a BIG >CACHE or as a SWAP AERA for virtural memory as Linux or OS/2 2.1 does ? If >no, is there any plan to add these functions in future ? From what I understand, It will use whatever it sees, provided the hardware supports it. For example, VLB is a 32 bit bus, so *BSD can use it. However, ISA has a 16Mb limitation, so if you have > 16Mb, everything above the 16Mb is a waste and can't be touched for DMA, etc. The ISA bus doesn't have the address lines to speak > 16Mb. Same goes for VLB if you are using ISA cards... -- Ack! Creek, not creek; Pop not soda; Car needs washed...