port-i386/46486: cannot boot install image (cannot mount root)

[blair.sadewitz%gmail.com@localhost]

>Number:         46486
>Category:       port-i386
>Synopsis:       cannot boot install image (cannot mount root)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun May 27 15:55:00 +0000 2012
>Originator:     Blair Sadewitz
>Release:        201205251930Z
>Organization:
>Environment:
NetBSD 6.99.7


>Description:
I am essentially having this problem:

boot device: cd0
root on cd0a dumps on cd0b
vfs_mountroot: can't open root device
cannot mount root, error = 6
root device (default cd0a):
[...]

If the console worked, I'd be able to type.  Unfortunately, it doesn't want to 
listen to me. :(  I don't have the means to connect a serial console.
>How-To-Repeat:
Already described here:

http://mail-index.netbsd.org/port-i386/2012/03/18/msg002758.html
>Fix: