can't boot with kern.mmxopt=1

[Richard Nyberg <rnyberg@xxxxxxxx>]

It works fine when kern.mmxopt=0, but when it's set to 1,
the kernel hangs after printing the line "SMP: AP CPU #1 Launched!".
A dmesg when kern.mmxopt=0 can be found below. Please tell me if
you need additional info, I don't know how to debug this...

	-Richard

Copyright (c) 2003-2004 The DragonFly Project.
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.
DragonFly 1.0-CURRENT #0: Sun May  2 15:28:02 CEST 2004
    rnyberg@xxxxxxxxxxxxxxxxxxx:/usr/obj/usr/src/sys/MURMELDJUR
CPU: Intel(R) Xeon(TM) CPU 2.66GHz (2657.82-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf27  Stepping = 7
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  Hyperthreading: 2 logical CPUs
real memory  = 1073172480 (1048020K bytes)
avail memory = 1035681792 (1011408K bytes)
Changing APIC ID for IO APIC #0 from 0 to 4 on chip
Changing APIC ID for IO APIC #1 from 0 to 5 on chip
Changing APIC ID for IO APIC #2 from 0 to 6 on chip
Programming 24 pins in IOAPIC #0
IOAPIC #0 intpin 2 -> irq 0
Programming 24 pins in IOAPIC #1
Programming 24 pins in IOAPIC #2
FreeBSD/SMP: Multiprocessor motherboard
 cpu0 (BSP): apic id:  0, version: 0x00050014, at 0xfee00000
 cpu1 (AP):  apic id:  3, version: 0x00050014, at 0xfee00000
 io0 (APIC): apic id:  4, version: 0x00178020, at 0xfec00000
 io1 (APIC): apic id:  5, version: 0x00178020, at 0xfec80000
 io2 (APIC): apic id:  6, version: 0x00178020, at 0xfec80800
Preloaded elf kernel "/kernel" at 0xc040a000.
Pentium Pro MTRR support enabled
pcibios: BIOS version 2.10
Using $PIR table, 8 entries at 0xc00feae0
acpi0: <DELL   WS 450 > on motherboard
installed MI handler for int 9
acpi0: power button is handled as a fixed feature programming model.
acpi_cpu0: <CPU> on acpi0
acpi_cpu1: <CPU> on acpi0
acpi_cpu2: <CPU> on acpi0
acpi_cpu3: <CPU> on acpi0
acpi_button0: <Power Button> on acpi0
npx0: <math processor> on motherboard
npx0: INT 16 interface
pcib0: <Host to PCI bridge> at pcibus 0 on motherboard
pci0: <PCI bus> on pcib0
IOAPIC #0 intpin 16 -> irq 2
IOAPIC #0 intpin 19 -> irq 13
IOAPIC #0 intpin 18 -> irq 16
IOAPIC #0 intpin 23 -> irq 17
IOAPIC #0 intpin 17 -> irq 18
agp0: <Intel Generic host to PCI bridge> mem 0xe8000000-0xefffffff at device 0.0 on pci0
pcib1: <PCI to PCI bridge (vendor=8086 device=2552)> mem 0xe0000000-0xe7ffffff at device 1.0 on pci0
pci1: <PCI bus> on pcib1
pci1: <ATI model 5159 graphics accelerator> at 0.0 irq 2
pcib2: <PCI to PCI bridge (vendor=8086 device=2553)> at device 2.0 on pci0
pci2: <PCI bus> on pcib2
pci2: <unknown card> (vendor=0x8086, dev=0x1461) at 28.0
pcib3: <PCI to PCI bridge (vendor=8086 device=1460)> at device 29.0 on pci2
pci3: <PCI bus> on pcib3
IOAPIC #1 intpin 0 -> irq 19
em0: <Intel(R) PRO/1000 Network Connection, Version - 1.7.25> port 0xdcc0-0xdcff mem 0xff6e0000-0xff6fffff irq 19 at device 14.0 on pci3
installed MI handler for int 19
em0:  Speed:N/A  Duplex:N/A
pci2: <unknown card> (vendor=0x8086, dev=0x1461) at 30.0
pcib4: <PCI to PCI bridge (vendor=8086 device=1460)> at device 31.0 on pci2
pci4: <PCI bus> on pcib4
uhci0: <Intel 82801DB (ICH4) USB controller USB-A> port 0xff80-0xff9f irq 2 at device 29.0 on pci0
installed MI handler for int 2
usb0: <Intel 82801DB (ICH4) USB controller USB-A> on uhci0
usb0: USB revision 1.0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
ums0: Logitech Inc. iFeel MouseMan, rev 1.00/1.01, addr 2, iclass 3/1
ums0: 4 buttons and Z dir.
uhci1: <Intel 82801DB (ICH4) USB controller USB-B> port 0xff60-0xff7f irq 13 at device 29.1 on pci0
installed MI handler for int 13
usb1: <Intel 82801DB (ICH4) USB controller USB-B> on uhci1
usb1: USB revision 1.0
uhub1: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
uhci2: <Intel 82801DB (ICH4) USB controller USB-C> port 0xff40-0xff5f irq 16 at device 29.2 on pci0
installed MI handler for int 16
usb2: <Intel 82801DB (ICH4) USB controller USB-C> on uhci2
usb2: USB revision 1.0
uhub2: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
pci0: <USB controller> at 29.7 irq 17
pcib5: <Intel 82801BA/BAM (ICH2) Hub to PCI bridge> at device 30.0 on pci0
pci5: <PCI bus> on pcib5
isab0: <PCI to ISA bridge (vendor=8086 device=24c0)> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel ICH4 ATA100 controller> port 0xffa0-0xffaf,0-0x3,0-0x7,0-0x3,0-0x7 irq 16 at device 31.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
installed MI handler for int 14
ata1: at 0x170 irq 15 on atapci0
installed MI handler for int 15
pci0: <unknown card> (vendor=0x8086, dev=0x24c3) at 31.3 irq 18
pcm0: <Intel ICH4 (82801DB)> port 0xcc40-0xcc7f,0xc800-0xc8ff mem 0xffa20000-0xffa200ff,0xffa20400-0xffa205ff irq 18 at device 31.5 on pci0
installed MI handler for int 18
pcm0: <Analog Devices AD1981B AC97 Codec>
orm0: <Option ROMs> at iomem 0xc0000-0xcafff,0xcb000-0xcc7ff,0xcc800-0xcffff on isa0
fdc0: <NEC 72065B or clone> at port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on isa0
installed MI handler for int 6
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
installed MI handler for int 1
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 16550A
installed MI handler for int 4
sio1 at port 0x2f8-0x2ff irq 3 on isa0
sio1: type 16550A
installed MI handler for int 3
installed MI handler for int 0
APIC_IO: Testing 8254 interrupt delivery
APIC_IO: routing 8254 via IOAPIC #0 intpin 2
SMP: AP CPU #1 Launched!
ad0: 38146MB <WDC WD400BB-75DEA0> [77504/16/63] at ata0-master UDMA100
acd0: DVD-ROM <LITEON DVD-ROM LTD163> at ata1-master UDMA33
acd1: CD-RW <HL-DT-ST GCE-8481B> at ata1-slave UDMA33
WARNING: "cd" is usurping "cd"'s cdevsw[]
Mounting root from ufs:/dev/ad0s2a
cd0 at ata1 bus 0 target 0 lun 0
cd0: <LITEON DVD-ROM LTD163 GDHG> Removable CD-ROM SCSI-0 device 
cd0: 33.000MB/s transfers
cd0: Attempt to query device size failed: NOT READY, Medium not present
cd1 at ata1 bus 0 target 1 lun 0
cd1: <HL-DT-ST CD-RW GCE-8481B C102> Removable CD-ROM SCSI-0 device 
cd1: 33.000MB/s transfers
cd1: Attempt to query device size failed: NOT READY, Medium not present - tray closed
em0: Link is up 100 Mbps Full Duplex