Date: Sat, 25 Oct 1997 15:16:26 -0400 (EDT) From: Chuck Robey <chuckr@glue.umd.edu> To: =?iso-8859-1?Q?=DEor=F0ur?= Ivarsson <totii@est.is> Cc: "Jamil J. Weatherbee" <jamil@trojanhorse.ml.org>, freebsd-hackers@FreeBSD.ORG Subject: Re: Parity Ram Message-ID: <Pine.BSF.3.96.971025151431.21591L-100000@picnic.mat.net> In-Reply-To: <34524948.41C67EA6@est.is>
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On Sat, 25 Oct 1997, Žoršur Ivarsson wrote: > Jamil J. Weatherbee wrote: > > > > Can someone fill me in on when you would want to use parity ram as opposed > > to non-parity ram these days? If there was some anomaly in memory how > > would freebsd handle it (is there a trap for parity error?) > > As far as I know, the 'parity check fail' is connected to NMI of CPU. > In most cases the BIOS rutines accept this and halt the computer with no > information on where or why , only something like 'NMI detected, system > halted' or > 'Memory parity fail - NMI generated , system halted'. Huh ? BIOS routines? What's that got to do with FreeBSD? We don't use the BIOS routines, they don't get called at all, right? If there's a parity violation, if that's wired to NMI, then the NMI get's called, but what that does is determined by FreeBSD, not your BIOS. > > The only reason for this might be giving you some warning of failed > memory rather > than failed software. > > This has helped me several times when I was suspecting broken memory in > the old days (90-93) :-) > > Thordur Ivarsson > > ----------------------------+----------------------------------------------- Chuck Robey | Interests include any kind of voice or data chuckr@glue.umd.edu | communications topic, C programming, and Unix. 213 Lakeside Drive Apt T-1 | Greenbelt, MD 20770 | I run Journey2 and picnic, both FreeBSD (301) 220-2114 | version 3.0 current -- and great FUN! ----------------------------+-----------------------------------------------
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