Dual boot SCO and Linux

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From - Mon May  3 06:26:01 1999
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From: John Gray <johng@sodapop.org>
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Subject: Re: Multibooting redhat linux 5.2 and SCO OSR5.0.4
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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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