Re: [Bug-grub] Re: can't get Windows to boot on secondary disk

[Jason Thomas]

use the map command

On Sun, May 04, 2003 at 08:27:34PM +0200, Andrej Mikus wrote:
> Team,
> 
> I made some investigations today regarding the issue, how does BIOS
> setting affect the Windows boot, but unfortunately, could not find an
> explanation.
> 
> I moved the Windows disk to slave on secondary channel, and with BIOS
> setting of this drive primary, Windows 98 boots without issue, and the
> primary partition on this disk is seen from Windows as C:
> 
> Without any hardware/BIOS change I booted linux from floppy in single
> user mode, and confirmed that the same drive is detected as /dev/hdd.
> In Windows I checked system properties and it shows drive C: assigned
> to disk on controller at address 170 (secondary).
> 
> So my previous thoughts about BIOS changing controllers I/O is confirmed
> incorrect and I feel there must be a software way of doing it.
> Is is possible to achieve similar functionality with grub?
> Or is it already to late for is after grub is already run from MBR of first
> disk?
> Perhaps a bug in the map command?
> Eventually, could grup chainload MBR of the other disk instead of
> jumping directly to configured partition?
> 
> Any comments appreciated.
> 
> Andrej
> 
> 
> 
> On Sun, 04.May.03 00:18:15 +0200, Andrej Mikus wrote:
> > In-Reply-To=15211.18834.607324.241398%40eden-hda7.my.local
> > Reply-To: 
> > 
> > Dear grub community,
> > 
> > I found a message at
> > http://mail.gnu.org/archive/html/bug-grub/2001-08/msg00026.html and it
> > is the applicable to my problem as outlined in the ssubject.
> > 
> > I bought a new drive and I am setting it up with RedHat Linux. I did not
> > want to make any changes to the original disk, so I moved it to
> > secondary. Installed grub on the new drive, but cannot get it working to
> > boot Windows on secondary. With the map command it starts, but as
> > mentioned in grub documentation:
> > 
> > > Caution: This is effective only if DOS (or Windows) uses BIOS to access
> > > the swapped disks. If that OS uses a special driver for the disks, this
> > > probably won't work. 
> > 
> > Because the system hangs when Windows goes to 32-bin mode, this is
> > indeed the problem. But the reason I am looking for help in this list is
> > the fact that I am able to boot succesfully from the secondary disk with
> > a configuration change in BIOS setup. I use Intel SE440BX-2 mainboard
> > with Phoenix BIOS 4.0 Release 6.0, Version 4S4EB2X0.86A.0009.P03 and it
> > contains setting for Hard drive boot order. If I put here the secondary
> > disk to a primary position, Windows boots without any problem.
> > 
> > I am wondering what kind of change does this BIOS setting do, and if
> > similar could be possible with grub. CMOS update and reboot is not very
> > convenient. I am considering swapping the drives and installing grub on
> > the Windows one, but seeing that BIOS can do it, I would like to
> > understand where is the actual problem. Is it possible that it swaps the
> > controller I/O ports or something othe hardware related?
> > 
> > Thanks in advance for any applicable comments.
> > 
> > Andrej
> > 
> 
> 
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-- 
Jason Thomas                           Phone:  +61 2 6257 7111
Unix System Administrator              Fax:    +61 2 6257 7311
Intology Services Pty. Ltd.            Mobile: 0418 29 66 81
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