Bug 65034

Summary: wont boot windows NT
Product: [Retired] Red Hat Linux Reporter: joel
Component: grubAssignee: Jeremy Katz <katzj>
Status: CLOSED WONTFIX QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: 7.3   
Target Milestone: ---   
Target Release: ---   
Hardware: i386   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2002-12-29 07:15:44 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
patch to make grub boot windows NT 4.0
none
spec file to include my patch none

Description joel 2002-05-16 13:34:47 UTC 
From Bugzilla Helper:
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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:
Always

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 13:38:11 UTC 
Created attachment 57584 [details]
patch to make grub boot windows NT 4.0
Comment 2 joel 2002-05-16 13:40:34 UTC 
Created attachment 57585 [details]
spec file to include my patch
Comment 3 Jeremy Katz 2002-05-20 20:41:20 UTC 
Patch sent upstream to the grub mailing list for comments
Comment 4 Jeremy Katz 2002-12-29 07:15:44 UTC 
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.