Date: Wed, 23 Jun 2004 08:57:45 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Jeremy Kister <freebsd-questions@jeremykister.com> Cc: freebsd-questions@freebsd.org Subject: Re: FreeBSD install on SCSI: Missing Operating System Message-ID: <20040623075745.GB46661@happy-idiot-talk.infracaninophile.co.uk> In-Reply-To: <000801c458df$8d381270$0201090a@jeremy01> References: <000801c458df$8d381270$0201090a@jeremy01>
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On Wed, Jun 23, 2004 at 01:04:24AM -0400, Jeremy Kister wrote:
> On Tuesday, June 22, 2004 10:57 PM, I wrote:
> > the whole installation process goes smooth, but upon reboot, I simply get
> > 'Missing Operating System'.
>
> I've given up on 4.9-R and tried 5.2.1-R, which is working fine.
Odd. The problems you were seeing are to do with the BIOS level
stuff, which is really independent of what OS you're trying to boot
up. At a guess you actually did something a bit differently during
the install.
For future reference, one thing that has changed over time is using
'packet' mode (BIOS Int 0x13 extensions) -- this provides an
alternative to CHS (Cylinder Head Sector) addressing as used in older
BIOSes. Packet mode is appropriate for large disks, and allows you to
boot from cylinders higher than 1023. It's basically the norm on any
recent system with large disk drives. Problem is you need a BIOS with
specific support for packet mode or it just won't work, so the default
has always been to assume 'nopacket'. It has been mooted that
switching the default to packet mode is an idea whose time has come,
but that change wasn't made between 4.x and 5.x. See boot0cfg(8) for
details of how to switch modes, but generally it's:
# boot0cfg -o packet ad0
Cheers,
Matthew
--
Dr Matthew J Seaman MA, D.Phil. 26 The Paddocks
Savill Way
PGP: http://www.infracaninophile.co.uk/pgpkey Marlow
Tel: +44 1628 476614 Bucks., SL7 1TH UK
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