kern/38540: recent i386 GENERIC kernel cannot boot with VIA chipset

[nakaji%jp.freebsd.org@localhost]

>Number:         38540
>Category:       kern
>Synopsis:       recent i386 GENERIC kernel cannot boot with VIA chipset
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Apr 29 08:25:00 +0000 2008
>Originator:     NAKAJI Hiroyuki
>Release:        NetBSD 4.99.61
>Organization:
>Environment:
NetBSD maki.4407.kankyo-u.ac.jp 4.99.61 NetBSD 4.99.61 (MAKI) #1: Tue Apr 29 
14:54:05 JST 2008  
root%maki.4407.kankyo-u.ac.jp@localhost:/usr/obj/sys/arch/i386/compile.i386/MAKI
 i386
>Description:
This is similar to kern/38469. The recent GENERIC kernel does not boot but 
GENERIC.NOACPI does. The mainboard is ECS PM800-M2 with VIA chipset.
http://www.ecs.com.tw/ECSWebSite/Products/ProductsDetail.aspx?DetailID=453&CategoryID=1&DetailName=Feature&MenuID=45&LanID=0

The kernel of 4.99.34 in October 2007 can boot.

I put the trace at http://d4407.kankyo-u.ac.jp/~nakaji/NetBSD/maki/acpitrace.txt

I also put dmesg.boot, kernel configuration, and acpidump's outputs at the same 
directory.
http://d4407.kankyo-u.ac.jp/~nakaji/NetBSD/maki/

o MAKI : unbootable kernel configuration
o dmesg.boot.12e : dmesg.boot of 4.99.34
o dmesg.boot.12e-noacpi : dmesg.boot of 4.99.61 without ACPI
o pm800-m2-12e.* : acpidump's output on 4.99.34

>How-To-Repeat:
I do not have another NetBSD/i386 using VIA chip and I cannot reproduce the 
problem on another PC.
>Fix:
N/A