i386/50887: MBR on kern.flp fails Compaq MBR validation on 4.5+
brian at reid.org
Sat Apr 12 21:50:05 PDT 2003
>Synopsis: MBR on kern.flp fails Compaq MBR validation on 4.5+
>Arrival-Date: Sat Apr 12 21:50:04 PDT 2003
>Originator: Brian Reid
>Release: FreeBSD 4.8-RELEASE i386
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
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.
Get a Deskpro EN and try to boot from a floppy derived from
kern.flp. It might fail on other Compaq models, too.
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.
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