Red Hat Bugzilla – Bug 65034
wont boot windows NT
Last modified: 2016-10-03 16:11:16 EDT
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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):
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
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.
Created attachment 57584 [details]
patch to make grub boot windows NT 4.0
Created attachment 57585 [details]
spec file to include my patch
Patch sent upstream to the grub mailing list for comments
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.