i386/50887: MBR on kern.flp fails Compaq MBR validation on 4.5+
Brian Reid
brian at reid.org
Sat Apr 12 21:50:05 PDT 2003
>Number: 50887
>Category: i386
>Synopsis: MBR on kern.flp fails Compaq MBR validation on 4.5+
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Apr 12 21:50:04 PDT 2003
>Closed-Date:
>Last-Modified:
>Originator: Brian Reid
>Release: FreeBSD 4.8-RELEASE i386
>Organization:
self
>Environment:
System: FreeBSD dhcp3.waverley.reid.org 4.8-RELEASE FreeBSD 4.8-RELEASE #0: Mon Mar 31 02:11:00 GMT 2003 root at freebsd-stable.sentex.ca:/usr/obj/usr/src/sys/GENERIC i386
Compaq Deskpro EN 733MHz Pentium III
>Description:
The floppy disk generated from floppies/kern.flp is not recognized
as having a valid MBR unless the BIOS option "Verify MBR" is
disabled. Earlier 2.* and 3.* boot.flp disks that I tested worked
fine. 4.7 and 4.8 both fail.
>How-To-Repeat:
Get a Deskpro EN and try to boot from a floppy derived from
kern.flp. It might fail on other Compaq models, too.
>Fix:
The right fix would be to figure out why the Compaq BIOS is
rejecting the MBR on that disk, and make it look like a
legal MBR. An obvious intermediate fix is to go into Setup
and disable the "verify MBR" option under "Advanced". But
I must confess I didn't figure that out until I had ripped
the machine apart and added a CD ROM dangling by its IDE
cable to do the actual install.
>Release-Note:
>Audit-Trail:
>Unformatted:
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