6.0-RC1 & ASUS P4R800-V/Sis 180 RAID

I upgraded my second machine to 6.0-RC1 this afternoon and have lost my 
raid mirror configured on an SIS 180 Raid controller (as provided on the 
ASUS P4R800-V motherboard).

I've read the release notes and double checked UPDATING and I didn't see 
any removal of existing support (other than 80386).  The array simply 
isn't even being picked up anymore (no AR0 device). 

What have I missed?

This is true regardless of a GENERIC or custom kernel.

The following is a cut-n-paste of the dmesg from my last GENERIC kernel 
boot:

========================================

FreeBSD 6.0-RC1 #1: Thu Oct 13 16:43:57 EDT 2005
    root_at_mercury.kingsquarry.net:/usr/obj/usr/src/sys/GENERIC
ACPI APIC Table: <RS300  AWRDACPI>
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Pentium(R) 4 CPU 3.00GHz (3006.90-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf34  Stepping = 4
  
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,C
MOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  Features2=0x441d<SSE3,RSVD2,MON,DS_CPL,CNTX-ID,<b14>>
  Hyperthreading: 2 logical CPUs
real memory  = 535756800 (510 MB)
avail memory = 514928640 (491 MB)
ioapic0: Changing APIC ID to 2
ioapic0 <Version 1.1> irqs 0-23 on motherboard
npx0: [FAST]
npx0: <math processor> on motherboard
npx0: INT 16 interface
acpi0: <RS300 AWRDACPI> on motherboard
acpi0: Overriding SCI Interrupt from IRQ 9 to IRQ 21
acpi0: Power Button (fixed)
pci_link0: <ACPI PCI Link LNKA> irq 0 on acpi0
pci_link1: <ACPI PCI Link LNKB> irq 0 on acpi0
pci_link2: <ACPI PCI Link LNKC> irq 0 on acpi0
pci_link3: <ACPI PCI Link LNKD> irq 0 on acpi0
Timecounter "ACPI-safe" frequency 3579545 Hz quality 1000
acpi_timer0: <32-bit timer at 3.579545MHz> port 0x4008-0x400b on acpi0
cpu0: <ACPI CPU> on acpi0
acpi_throttle0: <ACPI CPU Throttling> on cpu0
acpi_button0: <Power Button> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib1: <ACPI PCI-PCI bridge> at device 1.0 on pci0
pci1: <ACPI PCI bus> on pcib1
pci1: <display, VGA> at device 5.0 (no driver attached)
skc0: <Marvell Gigabit Ethernet> port 0xe400-0xe4ff mem 
0xe1000000-0xe1003fff ir
q 19 at device 13.0 on pci0
skc0: Marvell Yukon Lite Gigabit Ethernet rev. A3(0x7)
sk0: <Marvell Semiconductor, Inc. Yukon> on skc0
sk0: Ethernet address: 00:11:2f:9e:f6:f0
miibus0: <MII bus> on sk0
e1000phy0: <Marvell 88E1000 Gigabit PHY> on miibus0
e1000phy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 
1000baseTX-FDX, auto
ohci0: <OHCI (generic) USB controller> mem 0xe1004000-0xe1004fff irq 19 
at devic
e 19.0 on pci0
ohci0: [GIANT-LOCKED]
usb0: OHCI version 1.0, legacy support
usb0: SMM does not respond, resetting
usb0: <OHCI (generic) USB controller> on ohci0
usb0: USB revision 1.0
uhub0: (0x1002) OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 3 ports with 3 removable, self powered
ohci1: <OHCI (generic) USB controller> mem 0xe1005000-0xe1005fff irq 19 
at devic
e 19.1 on pci0
ohci1: [GIANT-LOCKED]
usb1: OHCI version 1.0, legacy support
usb1: SMM does not respond, resetting
usb1: <OHCI (generic) USB controller> on ohci1
usb1: USB revision 1.0
uhub1: (0x1002) OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 3 ports with 3 removable, self powered
ehci0: <EHCI (generic) USB 2.0 controller> mem 0xe1006000-0xe1006fff irq 
19 at d
evice 19.2 on pci0
ehci0: [GIANT-LOCKED]
usb2: EHCI version 1.0
usb2: companion controllers, 3 ports each: usb0 usb1
usb2: <EHCI (generic) USB 2.0 controller> on ehci0
usb2: USB revision 2.0
uhub2: (0x1002) EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub2: 6 ports with 6 removable, self powered
pci0: <serial bus, SMBus> at device 20.0 (no driver attached)
atapci0: <GENERIC ATA controller> port 
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xf00
0-0xf00f at device 20.1 on pci0
ata0: <ATA channel 0> on atapci0
ata1: <ATA channel 1> on atapci0
isab0: <PCI-ISA bridge> at device 20.3 on pci0
isa0: <ISA bus> on isab0
pcib2: <ACPI PCI-PCI bridge> at device 20.4 on pci0
pci2: <ACPI PCI bus> on pcib2
fwohci0: <VIA Fire II (VT6306)> port 0xc000-0xc07f mem 
0xe0000000-0xe00007ff irq
 17 at device 9.0 on pci2
fwohci0: OHCI version 1.0 (ROM=1)
fwohci0: No. of Isochronous channels is 4.
fwohci0: EUI64 00:e0:18:00:00:a2:7f:e5
fwohci0: Phy 1394a available S400, 2 ports.
fwohci0: Link S400, max_rec 2048 bytes.
firewire0: <IEEE1394(FireWire) bus> on fwohci0
fwe0: <Ethernet over FireWire> on firewire0
if_fwe0: Fake Ethernet address: 02:e0:18:a2:7f:e5
fwe0: Ethernet address: 02:e0:18:a2:7f:e5
fwe0: if_start running deferred for Giant
sbp0: <SBP-2/SCSI over FireWire> on firewire0
fwohci0: Initiate bus reset
fwohci0: node_id=0xc800ffc0, gen=1, CYCLEMASTER mode
firewire0: 1 nodes, maxhop <= 0, cable IRM = 0 (me)
firewire0: bus manager 0 (me)
atapci1: <SiS 180 SATA150 controller> port 
0xc400-0xc407,0xc800-0xc803,0xcc00-0x
cc07,0xd000-0xd003,0xd400-0xd40f irq 18 at device 10.0 on pci2
ata2: <ATA channel 0> on atapci1
ata3: <ATA channel 1> on atapci1
pci0: <multimedia, audio> at device 20.5 (no driver attached)
acpi_tz0: <Thermal Zone> on acpi0
fdc0: <floppy drive controller> port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on acpi0
fdc0: [FAST]
sio0: <16550A-compatible COM port> port 0x2f8-0x2ff irq 3 flags 0x10 on 
acpi0
sio0: type 16550A
sio1: <16550A-compatible COM port> port 0x3f8-0x3ff irq 4 on acpi0
sio1: type 16550A
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: [GIANT-LOCKED]
psm0: model Generic PS/2 mouse, device ID 0
pmtimer0 on isa0
orm0: <ISA Option ROMs> at iomem 0xcc000-0xcffff,0xd0000-0xd3fff on isa0
ppc0: parallel port not found.
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
Timecounter "TSC" frequency 3006903705 Hz quality 800
Timecounters tick every 1.000 msec
ad0: 76319MB <WDC WD800BB-22JHA0 05.01C05> at ata0-master UDMA33
ad2: 76319MB <WDC WD800BB-22JHA0 05.01C05> at ata1-master UDMA33
acd0: CDROM <CD-56E/3.0D> at ata1-slave PIO3
Trying to mount root from ufs:/dev/ad0s1a

========================================


    Thanks

    - Jeff