Date: Thu, 6 Nov 1997 23:19:33 +0000 From: James Raynard <fbugs@jraynard.demon.co.uk> To: J Wunsch <j@uriah.heep.sax.de> Cc: dgilbert@strike.velocet.ca, freebsd-bugs@freebsd.org Subject: Re: i386/4948: SCSI don't boot. Message-ID: <19971106231933.54562@jraynard.demon.co.uk> In-Reply-To: <199711052330.PAA18225@hub.freebsd.org>; from J Wunsch on Wed, Nov 05, 1997 at 03:30:02PM -0800 References: <199711052330.PAA18225@hub.freebsd.org>
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In case anyone wants more info on this (and to save wear and tear on someone's fingers the next time this comes up :-), there are no less than five sections on disk geometry in the Installation section of the FAQ (questions 2.13-2.17 in the version in -current). The FAQ is available as file://localhost/usr/share/doc/FAQ/FAQ.html on an installed system, or by clicking on "Documentation" at www.freebsd.org There's also a section on "dangerously dedicated" disks which for some bizarre reason has been put under "System Admininistration". On Wed, Nov 05, 1997 at 03:30:02PM -0800, J Wunsch wrote: > > Sounds like the classic geometry mismatch problem. > > If this is an ``all FreeBSD'' installation, just try dangerously > dedicated mode (which won't you allow to install a boot selector at > all, of course). > > If this is an installation where FreeBSD shares disks with other > systems, use the valid BIOS geometry. For the 1542, this is 32 > sectors per track, and 64 heads, and X cylinders (where `X' is the > number of Megabytes of your disk, rounded down to a full MB boundary) > in normal mode. I think it's 255 * 64 for ``DOS mode > 1 GB''. I > eventually forgot about the values the NCR BIOS is using -- all my > disks are running in dangerously dedicated mode so i can shuffle them > around between various controllers without hassles. -- James Raynard, Edinburgh, Scotland. james@jraynard.demon.co.uk http://www.freebsd.org/~jraynard/
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