CURRENT freeze on boot (ACPI)

Hi, sorry for the very incomplete report here..

First of all, this computer had previously been running with a  
CURRENT from early 2005--no problems.

Upon booting 7.0 for the first time (I cleared the old CURRENT  
install, installed fresh 6.1 install, and then cvsuped to current),  
there was a problem in my fstab, so it got that far and failed to  
mount all the partitions--I was able to do so successfully from the  
shell and fix up fstab.

Rebooting after that, I got a hard freeze while booting, after:

Starting devd
Starting ums0 moused:/
hw.acpi_cpu_cx_loerdy: C1 -> C3
Mounting NFS file systems:.

In successive boots, it seems to always make it this far, and usually  
lock up at this point, but occasionally will get a little bit  
farther--never to a login.

Early in the boot I get 10s or 100s of lines like:

"acpi: bad read from port 0xcfc (32)"

"acpi: bad write to port 0xcf8 (32), val 0x80003884"
"acpi: bad write to port 0xcfc (32), val 0x1d00"

Only these three lines, over and over again.

It boots up fine if I choose the to boot without ACPI.

The hardware is an AthlonXP CPU (about 1.5GHz) and the motherboard I  
believe is an Iwill KK266-Raid.

I should note that I'm pretty sure the ACPI on the motherboard is  
buggy--I get errors in the Windows System logs (such as ACPI trying  
to read an invalid address), though this computer has also been  
stable under XP, and under the previous FreeBSD installation.

my dmesg from an ACPI-less boot is below.

Is there anything else I can do?

Scott

======== dmesg (sans ACPI) =========
Copyright (c) 1992-2006 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
         The Regents of the University of California. All rights  
reserved.
FreeBSD 7.0-CURRENT #5: Wed May 31 22:00:30 EDT 2006
     root_at_starkbsd.dyndns.org:/usr/obj/usr/src/sys/STARKBSD
WARNING: WITNESS option enabled, expect reduced performance.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: AMD Athlon(tm) XP  (1396.03-MHz 686-class CPU)
   Origin = "AuthenticAMD"  Id = 0x662  Stepping = 2
    
Features=0x383f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,C 
MOV,PAT,PSE36,MMX,FXSR,SSE>
   AMD Features=0xc0480800<SYSCALL,MP,MMX+,3DNow+,3DNow>
real memory  = 536805376 (511 MB)
avail memory = 515723264 (491 MB)
kbd1 at kbdmux0
ath_hal: 0.9.16.16 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413,  
RF5413)
cpu0 on motherboard
pcib0: <Host to PCI bridge> pcibus 0 on motherboard
pir0: <PCI Interrupt Routing Table: 10 Entries> on motherboard
pci0: <PCI bus> on pcib0
agp0: <VIA 82C8363 (Apollo KT133x/KM133) host to PCI bridge> on hostb0
pcib1: <PCI-PCI bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
vgapci0: <VGA-compatible display> mem 0xd8000000-0xd8ffffff, 
0xd0000000-0xd7ffffff irq 11 at device 0.0 on pci1
isab0: <PCI-ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <VIA 82C686B UDMA100 controller> port  
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xc000-0xc00f at device 7.1 on pci0
atapci0: Correcting VIA config for southbridge data corruption bug
ata0: <ATA channel 0> on atapci0
ata1: <ATA channel 1> on atapci0
uhci0: <VIA 83C572 USB controller> port 0xc400-0xc41f irq 9 at device  
7.2 on pci0
uhci0: [GIANT-LOCKED]
usb0: <VIA 83C572 USB controller> on uhci0
usb0: USB revision 1.0
uhub0: <VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb0
uhub0: 2 ports with 2 removable, self powered
pci0: <bridge> at device 7.4 (no driver attached)
atapci1: <SiI 3112 SATA150 controller> port  
0xcc00-0xcc07,0xd000-0xd003,0xd400-0xd407,0xd800-0xd803,0xdc00-0xdc0f  
mem 0xdb821000-0xdb8211ff irq 10 at device 10.0 on pci0
ata2: <ATA channel 0> on atapci1
ata3: <ATA channel 1> on atapci1
fxp0: <Intel 82550 Pro/100 Ethernet> port 0xe000-0xe03f mem  
0xdb820000-0xdb820fff,0xdb800000-0xdb81ffff irq 11 at device 13.0 on  
pci0
miibus0: <MII bus> on fxp0
inphy0: <i82555 10/100 media interface> on miibus0
inphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
fxp0: Ethernet address: 00:02:b3:a4:71:57
pci0: <multimedia, audio> at device 15.0 (no driver attached)
pmtimer0 on isa0
orm0: <ISA Option ROM> at iomem 0xcc000-0xd07ff pnpid ORM0000 on isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
ppc0: parallel port not found.
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio0: configured irq 4 not in bitmap of probed irqs 0
sio0: port may not be enabled
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 8250 or not responding
sio0: [FAST]
sio1: configured irq 3 not in bitmap of probed irqs 0
sio1: port may not be enabled
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on  
isa0
unknown: <PNP0303> can't assign resources (port)
unknown: <PNP0c01> can't assign resources (memory)
ums0: <Logitech USB-PS/2 Optical Mouse, class 0/0, rev 2.00/18.00,  
addr 2> on uhub0
ums0: 6 buttons and Z dir.
Timecounter "TSC" frequency 1396029543 Hz quality 800
Timecounters tick every 1.000 msec
ad0: 114440MB <WDC WD1200JB-75CRA0 16.06V16> at ata0-master UDMA100
ad1: 76319MB <MAXTOR 4K080H4 A08.1500> at ata0-slave UDMA100
acd0: DVDROM <Pioneer DVD-ROM ATAPIModel DVD-106S 0109/E1.09> at ata1- 
master UDMA66
ad4: 35304MB <WDC WD360GD-00FNA0 34.06J34> at ata2-master SATA150
Trying to mount root from ufs:/dev/ad1s1a