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From: James Raynard <fqueries@jraynard.demon.co.uk>
Message-Id: <199608051810.SAA02267@jraynard.demon.co.uk>
Subject: Re: Panic mounting root
To: Annelise Anderson <andrsn@andrsn.stanford.edu>
Date: Mon, 5 Aug 1996 18:10:17 +0000 ()
Cc: questions@freebsd.org
In-Reply-To: <Pine.BSI.3.94.960805064728.2354A-100000@andrsn.stanford.edu> from "Annelise Anderson" at Aug 5, 96 06:54:22 am
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> > Not to start a war! I know some dissagree!
> > 
> > But bootable partitions *must* be under cylinder 1024. (504M)
> > This is a limitation of the PC System BIOS boot code!
> 
> I think this refers only to IDE/EIDE drives.  I have a 2.1G Conner
> fast scsi 2 installed as a second hard drive on an Adaptec 1542CF,
> and FreeBSD is running in the *last* 660 mb. on that drive (booting
> from the OS/2 boot manager).

The 504MB limit is what 1024 cylinders works out at for IDE drives.

For SCSI drives, it works out at either 1024MB or 4096MB, depending 
on whether you have "extended translation" (aka "support for DOS 
drives >1GB") disabled or enabled.