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From - Mon May 3 06:26:01 1999
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Message-ID: <372D282A.B9595932@sodapop.org>
From: John Gray <johng@sodapop.org>
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Subject: Re: Multibooting redhat linux 5.2 and SCO OSR5.0.4
References: <372CC813.6AFEF632@bigfoot.com>
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Date: Sun, 02 May 1999 21:38:03 -0700
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Salman Ashraf wrote:
> I have Redhat 5.2 and SCO OpenServer 5.0.4 on a machine and I would like
> to use LILO as a boot loader. Linux is installed on /dev/hdb and lilo is
> in the MBR. I installed SCO on /dev/hda, which already has win 98 on it.
> After SCO was installed, I guess it put its boot loader in the MBR
> because I'd get the SCO Boot: prompt when I'd boot my machine. So,
> I booted linux from the floppy and reran lilo after adding a clause for
> SCO in lilo.conf. It's something like
> other=/dev/hda3
> loader=/boot/chain.b
> label=sco
>
> But when I tried to boot into SCO, it wouldn't boot. It would just hang
> saying booting sco. I have to use the SCO boot and root disk to get into
> SCO, but then I suppose I need to mount my root filesystem from the hard
> disk or something because what I get from the floppy isn't all of it. If
> someone has a similar setup and can boot SCO successfully from lilo or
> just knows how to do this, I'd really appreciate any help. I need to get
> this running pretty soon. Thanks in advance.
>
> Salman
please see SCO TA 106287 103327 106107 You will need to read them
in full. To start you will need to change the device nodes for the disk
to point
to the absolute partitions according to the way they are seen from the SCO
fdisk. This will include /dev/root rroot swap rswap stand rstand and
anything
else you have created. The /dev/dsk/ /dev/rdsk/ /dev/hd /dev/rhd
entries too.
once you have done that you will need to change the /etc/conf/node.d/hd
file
and the /etc/conf/cf.d/sassign file because the sassign has floating
minors.
last but not least the /etc/default/boot will need a tweak to tell boot
where
to grab the /unix binary.
The minor number scheme by default has the disk driver keying off the
active
partition. In this way you can have multiple installs of SCO and they
will all work
together. The procedure (more of an outline) listed above changes
this to
use the absolute position of the OS. IT does work, I have done it
several times.
Keep in mind that there are three phases that you need to keep
functional.

1) /boot where does it look to get the kernel? hd(40)unix
-> hd(24) unix ????
2) /unix Where does the kernel think the root file system and
swap are?
3) utilities When you run the system commands where are they going
to be getting
the info they are requesting. Make sure the
device nodes point to the
part fo the disk that the kernel is looking.
Remember the kernel doesn't
care. If asked to get X bytes from the wrong
partition it will.
Hope this helps.
-john
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