Hi,
       From: maximum entropy <entropy@tappedin.com>
    Subject: Re: Cranky machine...
      Date : Fri, 06 Jul 2001 11:33:17 -0400 (EDT)

$ I'll see if I can back out machdep.c to closer to the 1.5 branchpoint.

I check next URL.
<URL:http://cvsweb.netbsd.org/cgi-bin/cvsweb.cgi/syssrc/sys/arch/i386/i386/machdep.c>

I found change of memory probe routines.
The commitlog is below: 
------------------< commitlog >------------------------------------
Revision 1.401 / (download) - annotate - [select for diffs] , 
Thu Sep 28 18:31:36 2000 UTC (9months, 1 week ago) by thorpej 
Branch: MAIN 
Changes since 1.400: +328 -56 lines
Diff to previous 1.400 (colored) 

Reintroduce the ACPI memory map code.  The bug that caused the
IDT to be scribbled over on some systems was found and fixed by
T.SHIOZAKI <tshiozak@netbsd.org>.
------------------< commitlog >------------------------------------

The latest memory probe routines use INT 15H,E820H BIOS CALL.
If possible,How about updating your MotherBoard BIOS?

Regards!
---
 Masanori Kanaoka	kanaoka@ann.hi-ho.ne.jp