Boot failure on ASUS A8V AMD 64(3200) with latest Preview

["Steve O'Hara-Smith" <steve@xxxxxxxxxx>]

	Hi,

	Just built world and kernel to latest preview (repository synced
from chlamydia at 6am GMT this morning). Unfortunately the kernel will not
boot on my Asus A8V based box: it stops with the messages below on the
screen and does not respond to the keyboard at all. Booting with ACPI
disabled doesn't help nor does fiddling with the ACPI related controls in
the BIOS.

real memory = 536543232 (523968K bytes)
avail memory = 511655936 (499664K bytes) 
Preloaded elf kernel "/kernel" at 0xc0571000.
sched_ithd: stray interrupt 7
Pentuium Pro MTRR support enabled 
md0: Malloc disk
ACPI: RSDP @ 0x0xfa7c0/0x0021 ( v  2 ACPIAM)
ACPI: XSDT @ 0x0x1ffb0100/0x003C (v 1 A M I  OEMXSDT 0x10000506 MSFT
0x00000097) ACPI: FACP @ 0x0x1ffb0290/0x00F4 (v 3 A M I  OEMFACP 0x10000506
MSFT 0x00000097) ACPI: DSDT @ 0x0x1ffb03f0/0x3A4E (v 1  A0036 A0036001
0x00000001 MSFT 0x1000000D) ACPI: FACS @0x0x1ffc0000/0x0040
ACPI: APIC @ 0x0x1ffb0390/0x0052 (v 1 A M I  OEMAPIC 0x10000506 MSFT
0x00000097) ACPI: OEMB @ 0x0x1ffc0040/0x003F (v 1 A M I  OEMBIOS 0x10000506
MSFT 0x00000097) pcibios: BIOS version 2.1.0 
Using $PIR table, 12 entries at 0xc00f59b0 
acpi0: <A M I OEMXSDT> on motherboard 

	Using a slightly older Preview kernel I get:

md0: Malloc disk
pcibios: BIOS version 2.10
Using $PIR table, 12 entries at 0xc00f59b0
acpi0: <A M I OEMXSDT> on motherboard
acpi0: Power Button (fixed)
Warning: ACPI is disabling APM's device.  You can't run both
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x808-0x80b on acpi0
cpu0: <ACPI CPU> on acpi0
acpi_button0: <Power Button> on acpi0
acpi_button1: <Sleep Button> on acpi0
sched_ithd: stray interrupt 7
npx0: <math processor> on motherboard

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