install/44774: another install CD with / on cd0a regression

[martin%NetBSD.org@localhost]

>Number:         44774
>Category:       install
>Synopsis:       Install CD not working properly on system with raid as /
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    install-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 26 16:55:00 +0000 2011
>Originator:     Martin Husemann
>Release:        NetBSD 5.99.48
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD sunny-weather.duskware.de 5.99.48 NetBSD 5.99.48 (SUNNY.MP) #8: 
Wed Mar 23 21:42:11 CET 2011 
martin%night-porter.duskware.de@localhost:/usr/src/sys/arch/sparc64/compile/SUNNY.MP
 sparc64
Architecture: sparc64
Machine: sparc64
>Description:

When booting a install CD with / on cd0a, the GENERIC kernel is used instead
of a special INSTALL one. This means the raid-autoconfiguration-root-fs 
override code will be active. So if you do this on a machine that usually
boots from / on raid0, you will not end up in sysinst but in standard
multi user mode.

Workaround: boot with -a.

>How-To-Repeat:
s/a
>Fix:
Add a boot.cfg statement to suppress raid root override (but not raid
auto configuration in general), and modify the boot.cfg files on the install
CDs.