On Mon, Jan 29, 2007 at 12:10:00AM +0000, thomas.feddersen@t-online.de wrote:
> "/var/run/dmesg.boot" is garbled (continous "M^?M^?") at the beginning
> and at the end, although the messages run legibly over the console
> screen at boot time. 

Please see if this commit:

http://mail-index.netbsd.org/source-changes/2007/01/06/0050.html

fixes your problem.

You could try a newer kernel from autobuilds.