Date: Tue, 12 Nov 1996 11:17:25 +0500 From: "David Alderman" <dave@persprog.com> To: "Michael L. VanLoon -- HeadCandy.com" <michaelv@MindBender.serv.net>, Harlan Stenn <Harlan.Stenn@pfcs.com>, rschof@mccomm.nl, freebsd-hardware@freebsd.org Subject: Re: After changing to an AHA2940 I can't boot the kernel. Message-ID: <229687605AD@dasa.ppi.com>
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> From: "Michael L. VanLoon -- HeadCandy.com" <michaelv@MindBender.serv.net> > > >Most likely problem: the sector mapping on one controller is different from > >that on the other. > > This is theoretically possible. But in the Real World, I have never > seen this happen, juggling drives between a BusLogic BT747s, a BT956c, > an Adaptec 2940UW, and an NCR 53c810. I think I mixed a 1542 in there > a few times, too, but I'm not positive. > You must have never used Future Domain, have you? ;-) All of the controllers you mentioned forutnately use the same geometry scheme AFAIK. There are controllers out there that use different mapping schemes that can cause failure - particularly older models. Also DOS>1G support can cause boot loader problems, although I don't remember the boot loader failure in the place mentioned. Actually I have encountered what appears to be a geometry problem involving the same controller in two different motherbards. Going from a ASUS P55TP4N to an ASUS P55T2P4 with a hard disk and controller results in a failure to load the boot loader. Of course, this was under SCO (and who knows what atrocities they are committing in their boot loader) but it's still quite a mystery. ====================================== When philosophy conflicts with reality, choose reality. Dave Alderman -- dave@persprog.com ======================================
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