Bug 80866

Motherboard from MSI, RS480M2-IL (aka MS-7093)
Product details: 
http://www.msi.com.tw/program/products/mainboard/mbd/pro_mbd_detail.php?UID=639

dmesg output:
Copyright (c) 1992-2005 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 5.4-STABLE #2: Tue May  3 22:40:03 CEST 2005
    root@kg-quiet.kg4.no:/usr/obj/usr/src/sys/QUIET
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: AMD Athlon(tm) 64 Processor 3000+ (1790.84-MHz K8-class CPU)
  Origin = "AuthenticAMD"  Id = 0x10ff0  Stepping = 0
  Features=0x78bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2>
  AMD Features=0xe2500800<SYSCALL,NX,MMX+,<b25>,LM,3DNow+,3DNow>
real memory  = 938409984 (894 MB)
avail memory = 894029824 (852 MB)
acpi0: <RS480 AWRDACPI> on motherboard
acpi0: Power Button (fixed)
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)
atapci0: <GENERIC ATA controller> port 0xfa00-0xfa0f,0xfb00-0xfb03,0xfc00-0xfc07,0xfd00-0xfd03,0xfe00-0xfe07 irq 11 at device 17.0 on pci0
ata2: channel #0 on atapci0
ata3: channel #1 on atapci0
atapci1: <GENERIC ATA controller> port 0xf500-0xf50f,0xf600-0xf603,0xf700-0xf707,0xf800-0xf803,0xf900-0xf907 irq 10 at device 18.0 on pci0
ata4: channel #0 on atapci1
ata5: channel #1 on atapci1
ohci0: <OHCI (generic) USB controller> mem 0xfe02d000-0xfe02dfff irq 10 at device 19.0 on pci0
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: 4 ports with 4 removable, self powered
ohci1: <OHCI (generic) USB controller> mem 0xfe02c000-0xfe02cfff irq 10 at device 19.1 on pci0
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: 4 ports with 4 removable, self powered
pci0: <serial bus, USB> at device 19.2 (no driver attached)
pci0: <serial bus, SMBus> at device 20.0 (no driver attached)
atapci2: <GENERIC ATA controller> port 0xf300-0xf30f,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 20.1 on pci0
ata0: channel #0 on atapci2
ata1: channel #1 on atapci2
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
rl0: <RealTek 8139 10/100BaseTX> port 0xdf00-0xdfff mem 0xfdcff000-0xfdcff0ff irq 5 at device 3.0 on pci2
miibus0: <MII bus> on rl0
rlphy0: <RealTek internal media interface> on miibus0
rlphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
rl0: Ethernet address: 00:11:09:f6:dc:02
fwohci0: <VIA Fire II (VT6306)> port 0xde00-0xde7f mem 0xfdcfe000-0xfdcfe7ff irq 11 at device 4.0 on pci2
fwohci0: OHCI version 1.10 (ROM=1)
fwohci0: No. of Isochronous channels is 4.
fwohci0: EUI64 00:10:dc:00:00:93:dd:14
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: 02:10:dc:93:dd:14
fwe0: Ethernet address: 02:10:dc:93:dd:14
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)
pci0: <multimedia, audio> at device 20.5 (no driver attached)
fdc0: <floppy drive controller> port 0x3f7,0x3f0-0x3f5 irq 6 drq 2 on acpi0
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
sio0: <16550A-compatible COM port> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
sio0: type 16550A
ppc0: <ECP parallel printer port> port 0x778-0x77b,0x378-0x37f irq 7 drq 3 on acpi0
ppc0: Generic chipset (EPP/NIBBLE) in COMPATIBLE mode
ppbus0: <Parallel port bus> on ppc0
plip0: <PLIP network interface> on ppbus0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
atkbdc0: <Keyboard controller (i8042)> port 0x64,0x60 irq 1 on acpi0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model IntelliMouse Explorer, device ID 4
orm0: <ISA Option ROMs> at iomem 0xd0000-0xd3fff,0xc0000-0xccfff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
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
ums0: Wireless Mouse Wireless Mouse, rev 1.10/1.01, addr 2, iclass 3/1
ums0: 5 buttons and Z dir.
Timecounter "TSC" frequency 1790835886 Hz quality 800
Timecounters tick every 1.000 msec
ad0: 114473MB <ST3120026A/8.01> [232581/16/63] at ata0-master UDMA33
acd0: CDROM <SAMSUNG CD-ROM SC-148F/PS05> at ata1-master PIO4
Mounting root from ufs:/dev/ad0s1a

Issues:
does not boot with acpi turned on. 

Special notes:
sound not supported yet, usb not tested, gfx (IGP - onboard graphic chips) suppport still flaky (vesa driver works, radeon driver does not).

Fix: 

Workaround for acpi problem: In /boot/loader.conf, insert 
  
  hint.apic.0.disabled="1"

Note: it takes a long time (about 15 seconds) after printing the 'acd0...' line before booting continues.