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Re: Error booting diag partition on T42 laptop

From: G. Vincent Castellano
Subject: Re: Error booting diag partition on T42 laptop
Date: Wed, 05 Oct 2005 16:01:15 -0400
User-agent: Mozilla Thunderbird 1.0.7-1.1.fc3 (X11/20050929)

Thanks for a prompt reply. I'll need some clarification on some of your points, though it sounds to me like this is going to be too much work to fix.

Peter Jones wrote:
On Wed, 2005-10-05 at 09:24 -0400, G. Vincent Castellano wrote:

I have an IBM T42 laptop which includes a diagnostics/restore partition and I
want to be able to boot this from Grub, as well as the XP and RedHat partitions.

I started out by booting from a RedHat install CD, deleted the Windows XP partition, and added Linux Swap and ext2 filesystems, then I was able to use the diag/recovery partition to restore XP to the space remaining. I can boot into XP and RedHat no problem, but not to the Diag partition.

This happens because the kernel brokenly disables the Host Protected
Area, and during some OS installation you've wiped the MBR and written a
new one with disk geometry read from the disk.

That would be the RedHat install.

There's really no way to "undo"; the data is gone so you need to get it
from IBM.  Even then, the same kernel bug plus the userland and
installer's ignorance will probably bite you.

I had enough foresight to build myself a set of recovery CDs before I started this exercise so I can get back the original factory config. But it doesn't sound like there is an easy way to achieve the desired result.

Maybe I will try the recovery CDs and see if they offer any options for the reinstallation, though I would be surprised if this were the case.

What if I decline to install grub from the RedHat CD and instead do it manually? Would that afford any means of preserving the HPA?

I've got a patch for the kernel that I need to send upstream, which will
make it so distribution installers can at least control if they reset
HPA or not.  Unfortunately at this point we also need to do workarounds
for peoples systems that have already been screwed up :/

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