The following reply was made to PR port-alpha/36628; it has been noted by GNATS.

From: "Christoph Franzen" <ChristophFranzen@gmx.net>
To: Izumi Tsutsui <tsutsui@ceres.dti.ne.jp>
Cc: gnats-bugs@NetBSD.org
Subject: Re: port-alpha/36628: cdhdtape image panics with memory management trap on Jensen
Date: Sun, 22 Jul 2007 15:44:08 +0200

 Hello again,
 
 > > This one shows apparently an error which
 > > also occured in a previous version of Netbsd. It hangs forever after
 > > recognising the floppy. I read old posts in the archives where
 > > somebody said that removing the floppy would not work.
 
 I investigated further and finally found some hint about the same or 
 a similar issue in the archive:
 http://mail-index.netbsd.org/port-alpha/2001/01/09/0001.html
 
 > Could you get ddb(4) prompt by sending break via serial console
 > at the point?
 
 Yes, the ddb unfortunately gives no further information, though (at 
 least nothing seeming useful to me).
 
 > After fdc(4), I guess mcclock at isa (which should be not matched) is
 > checked, interrupts are enabled, and then fd0 at fdc0 is probed.
 > ("scsibus0: waiting 2 seconds..." message should follow)
 > 
 > If you can get ddb(4) prompt, I guess interrupts might be enabled but
 > not served properly. We could get some info by backtrace anyway. If
 > not, we should check where actually the hang occurs during
 > cpu_configure(9), by sprinkling printf or so.
 
 I think it would be best to try some printfs.
 
 -- 
 Christoph Franzen