NetBSD Problem Report #46893

From www@NetBSD.org  Mon Sep  3 08:28:27 2012
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Date: Mon,  3 Sep 2012 08:28:26 +0000 (UTC)
From: roy@marples.name
Reply-To: roy@marples.name
To: gnats-bugs@NetBSD.org
Subject: sysinst(8) sets up an invalid disk layout
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>Number:         46893
>Category:       port-i386
>Synopsis:       sysinst(8) sets up an invalid disk layout
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Sep 03 08:30:00 +0000 2012
>Last-Modified:  Mon Sep 03 09:51:42 +0000 2012
>Originator:     Roy Marples
>Release:        6.0 RC1
>Organization:
>Environment:
NetBSD uberserver.marples.name 6.0_RC1 NetBSD 6.0_RC1 (GENERIC) amd64
>Description:
I bought a Shuttle XS35 702. I started a PXE install of NetBSD-6.0 RC1 and selected all default options aside from custom sets to install. Installation was flawless, but upon reboot I was greated with a message "NetBSD MBR: No operating system found".



I've uploaded screenshots of fdisk and disklabel output from the faulty install here:
http://www.facebook.com/photo.php?fbid=521189127906889&set=pcb.521189244573544&type=1&theater



Also, a support excerpt from Martin Husemann

On Thu, Aug 30, 2012 at 12:24:51PM +0200, Martin Husemann wrote:
    Disk: /dev/wd0d NetBSD disklabel disk geometry: cylinders: 310101, heads: 16, sectors/track: 63 (1008 sectors/cylinder) total sectors: 312581808 BIOS disk geometry: cylinders: 1023, heads: 255, sectors/track: 63 (16065 sectors/cylinder) total sectors: 312581808 

Ok, I now got what jak was trying to explain to you:

the BIOS disk geometry is invalid, 255 heads is an impossible value (it needs
to be between 1 and 16). I can not emulate this geometry with qemu, as it
rejects this invalid configuration.

So: something must be wrong in the bootblocks (which pass this entry to the
kernel).

Can you please file a PR?
>How-To-Repeat:

>Fix:
I worked around the problem by using a NetBSD 5.1.2 INSTALL kernel to setup the disklabel and format it to FFSv2. Once this was complete, I changed back to the NetBSD 6.0 RC1 INSTALL kernel and it worked just fine.

>Release-Note:

>Audit-Trail:

Responsible-Changed-From-To: install-manager->portmaster-i386
Responsible-Changed-By: martin@NetBSD.org
Responsible-Changed-When: Mon, 03 Sep 2012 09:48:22 +0000
Responsible-Changed-Why:
This is a port specific problem with the bootblocks


Responsible-Changed-From-To: portmaster-i386->port-i386-maintainer
Responsible-Changed-By: martin@NetBSD.org
Responsible-Changed-When: Mon, 03 Sep 2012 09:51:42 +0000
Responsible-Changed-Why:
Fix bogus owner


>Unformatted:

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