NetBSD 4.0.1 on a Powerbook 180

[Thomas Carlson <tcarlson%sharedcup.com@localhost>]

Every once in a while I remove NetBSD 2.1 (the last version of NetBSD  
that boots successfully on my Powerbook 180) and install the current  
release to see if it works any better than versions 3.0-4.0.  I  
recently used the traditional method to install the 4.0.1 GENERIC  
kernel, base, and etc.  Result:  kernel panic.  Then, I reinstalled  
base and etc along with the GENERICSBC kernel.  It boots into single- 
user mode just fine, but after mounting / and changing /etc/rc.conf a  
reboot gives me:

Booting...
Magic numbers do not match -- Improper UFS partition.
Could not open kernel "netbsd".

This is pretty much what has happened for the last few years since  
NetBSD 3.0 was released.  I have tried a variety of different hard  
drives on this machine (the current one being a 1 GB Microtech  
RoadRunner GO-Drive which is an ATA drive piggybacked on a SCSI  
card), all with the same result.  My question:  has anyone out there  
successfully installed a recent version of NetBSD on a 1xx series  
Powerbook?  If so, how?

Tom