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Bug 65034 - wont boot windows NT
wont boot windows NT
Product: Red Hat Linux
Classification: Retired
Component: grub (Show other bugs)
i386 Linux
medium Severity medium
: ---
: ---
Assigned To: Jeremy Katz
Depends On:
  Show dependency treegraph
Reported: 2002-05-16 09:34 EDT by joel
Modified: 2016-10-03 16:11 EDT (History)
0 users

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2002-12-29 02:15:44 EST
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
patch to make grub boot windows NT 4.0 (502 bytes, patch)
2002-05-16 09:38 EDT, joel
no flags Details | Diff
spec file to include my patch (6.84 KB, text/plain)
2002-05-16 09:40 EDT, joel
no flags Details

External Trackers
Tracker ID Priority Status Summary Last Updated
oVirt gerrit 65034 master MERGED resourceManager: Add module api 2016-10-03 16:11 EDT

  None (edit)
Description joel 2002-05-16 09:34:47 EDT
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0rc1) Gecko/20020417

Description of problem:
The version of grub included with RH 7.3 won't boot windows NT 4.0 SP3 on my
system. NT boot fails with bluescreen "INACCESSIBLE_BOOT_DEVICE". Before upgrade
to RH 7.3 my system worked fine as a triple boot setup: /dev/sda1 WinNT;
/dev/sda2 Win95; /dev/sda3 RH Linux. Before upgrade system was running RH 7.0
and triple boot with Lilo was working fine.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Upgrade to RH 7.3
2. Choose grub as bootloader
3. Add other OSes to /etc/grub.conf

Actual Results:  Win95 and Linux boot fine, WinNT bluescreens when trying to boot

Expected Results:  All three OSes should boot

Additional info:

Research on web indicated that WinNT expects bootstrap loader to begin with a
CLI instruction. Checking grub sources shows it starts with a JMP followed by a
CLI. Solution: Change 1st instruction to a CLI, remove a NOP and JMP to main
part of bootstrap code. Rebuild and reinstall grub. Tested on my triple boot
system and a normal single boot RH 7.3 system and works.
Comment 1 joel 2002-05-16 09:38:11 EDT
Created attachment 57584 [details]
patch to make grub boot windows NT 4.0
Comment 2 joel 2002-05-16 09:40:34 EDT
Created attachment 57585 [details]
spec file to include my patch
Comment 3 Jeremy Katz 2002-05-20 16:41:20 EDT
Patch sent upstream to the grub mailing list for comments
Comment 4 Jeremy Katz 2002-12-29 02:15:44 EST
This patch isn't valid because if you put the modified version of GRUB on a FAT
floppy or partition, Windows no longer recognizes it as properly formatted. 
Since there have been no other reports of this being a problem, I'm not really
able to do much more.

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