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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!spool.mu.edu!usenet.eel.ufl.edu!news-res.gsl.net!news.gsl.net!news.mathworks.com!newsfeed.internetmci.com!in2.uu.net!fox.almaden.ibm.com!garlic.com!puffin.com!not-for-mail From: chrisj@puffin.com (Chris Jewell) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: Can't boot 2.1 with 16MB? Date: 10 Aug 1996 16:45:12 -0700 Organization: The laughter-filled home of Chris and Jan, Hollister, CA, USA Lines: 28 Message-ID: <4uj6u8$a1g@tufted.puffin.com> References: <4ubva8$noa@news3.realtime.net> NNTP-Posting-Host: localhost.puffin.com Keywords: cmos Posted and mailed. In article <4ubva8$noa@news3.realtime.net>, Tushar Patel <tushar@ecpi.com> wrote: ... >I had 386 machine with 8MB of ram and running 2.1 FreeBSD on it fine. > >I put 16MB of memory and when I try to boot now then I get following >message. ... >fatal trap 12 page fault while in address .... >Fault virtual address 0x701ed7a4 >fault code = Supervisor read, page not present > = 0xc >panic vm_page_free freeing free page... In the CMOS setup, if you choose not to shadow various addresses in the upper 384K of the first megabyte of address space (card ROM BIOS etc), there may be an option to remap the unused shadow RAM to high addresses, increasing your available memory. I recently had symptoms just like yours on a 486 system, and turning off that option cured the problem. According to a friend (Hi, Leonard!), with most motherboard chipsets remapping of unused shadow RAM works only with 8MB or less, which is consistent with your experience. -- Chris Jewell chrisj@puffin.com 1341 Ramona Ave Hollister CA USA 95023