panic: probing for non-PCI bus

Hi,

Upgrading a Asus P2L97-DS dual Pentium II 266MHz box, I got this panic
when booting:

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Console: serial port
BIOS drive A: is disk0
BIOS drive C: is disk1
BIOS drive D: is disk2
BIOS drive E: is disk3
BIOS 640kB/130036kB available memory

FreeBSD/i386 bootstrap loader, Revision 1.1
(jhay_at_beast.icomtek.csir.co.za, Sun Nov  2 14:16:55 SAST 2003)
Loading /boot/defaults/loader.conf 
/boot/kernel/kernel text=0x23372c data=0x27fcc+0x47494 syms=[0x4+0x31690+0x4+0x3de08]
/boot/kernel/if_vlan.ko text=0x22b0 data=0x1d8+0x5c syms=[0x4+0x620+0x4+0x573]
/boot/kernel/if_fxp.ko text=0x77c0 data=0xfd4+0xc syms=[0x4+0xc50+0x4+0xceb]
loading required module 'miibus'
/boot/kernel/miibus.ko text=0x15940 data=0xc84+0x68 syms=[0x4+0x1a90+0x4+0x2240]
/boot/kernel/usb.ko text=0x201e8 data=0xb4c+0x148 syms=[0x4+0x2ad0+0x4+0x30bb]

Hit [Enter] to boot immediately, or any other key for command prompt.
Booting [/boot/kernel/kernel]...               
Copyright (c) 1992-2003 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 5.1-CURRENT #50: Mon Nov 10 17:51:13 SAST 2003
    jhay_at_beast.icomtek.csir.co.za:/b/src/sys/i386/compile/BEAST
Preloaded elf kernel "/boot/kernel/kernel" at 0xc0768000.
Preloaded elf module "/boot/kernel/if_vlan.ko" at 0xc076821c.
Preloaded elf module "/boot/kernel/if_fxp.ko" at 0xc07682c8.
Preloaded elf module "/boot/kernel/miibus.ko" at 0xc0768374.
Preloaded elf module "/boot/kernel/usb.ko" at 0xc0768420.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Pentium II/Pentium II Xeon/Celeron (267.27-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x633  Stepping = 3
  Features=0x80fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,MMX>
real memory  = 134205440 (127 MB)
avail memory = 125018112 (119 MB)
MPTable: <OEM00000 PROD00000000>
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
 cpu0 (BSP): APIC ID:  1
 cpu1 (AP): APIC ID:  0
ioapic0: Assuming intbase of 0
ioapic0 <Version 1.1> irqs 0-23 on motherboard
Pentium Pro MTRR support enabled
acpi0: <ASUS   P2L97-DS> on motherboard
pcibios: BIOS version 2.10
Using $PIR table, 7 entries at 0xc00f0d20
acpi0: Power Button (fixed)
Timecounter "ACPI-safe" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0xe408-0xe40b on acpi0
acpi_cpu0: <CPU> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib0: slot 4 INTD is routed to irq 5
pcib0: slot 6 INTA is routed to irq 5
pcib0: slot 10 INTA is routed to irq 12
pcib0: slot 11 INTA is routed to irq 10
pcib0: slot 12 INTA is routed to irq 11
panic: probing for non-PCI bus
cpuid = 0; 
Uptime: 1s
Shutting down ACPI
Automatic reboot in 15 seconds - press a key on the console to abort
Rebooting...
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John
-- 
John Hay -- John.Hay_at_icomtek.csir.co.za / jhay_at_FreeBSD.org