MP Config Table has bad signature: \^B

LukeD at LukeD at
Sat May 1 12:31:26 PDT 2004

I get
"mptable_probe: MP Config Table has bad signature: \^B"
while the kernel is loading.
However after the kernel loads I can log in and run mptable and can't find
this bad signature anywhere.
What does this mean?

Here's the dmesg and mptable output:

Copyright (c) 1992-2004 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 5.2-CURRENT #0: Thu Apr 29 19:15:45 PDT 2004
    root at
WARNING: WITNESS option enabled, expect reduced performance.
Preloaded elf kernel "/boot/kernel/kernel" at 0xc09a1000.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Pentium/P54C (166.19-MHz 586-class CPU)
  Origin = "GenuineIntel"  Id = 0x52c  Stepping = 12
real memory  = 50331648 (48 MB)
avail memory = 39731200 (37 MB)
mptable_probe: MP Config Table has bad signature: \^B
Intel Pentium detected, installing workaround for F00F bug
random: <entropy source, Software, Yarrow>
cpu0 on motherboard
npx0: [FAST]
npx0: <math processor> on motherboard
npx0: INT 16 interface
pcibios: BIOS version 2.10
pcib0: <Host to PCI bridge> at pcibus 0 on motherboard
pci0: <PCI bus> on pcib0
eisab0: <PCI-EISA bridge> at device 7.0 on pci0
eisa0: <EISA bus> on eisab0
mainboard0: <AMI7291 (System Board)> on eisa0 slot 0
isa0: <ISA bus> on eisab0
atapci0: <CMD 646 WDMA2 controller> port
0xffa0-0xffaf,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 irq 14 at device 8.0 on
atapci0: Reserved 0x10 bytes for rid 0x20 type 4 at 0xffa0
atapci0: Reserved 0x8 bytes for rid 0x10 type 4 at 0x1f0
atapci0: Reserved 0x1 bytes for rid 0x14 type 4 at 0x3f6
ata0: at 0x1f0 irq 14 on atapci0
atapci0: Reserved 0x8 bytes for rid 0x18 type 4 at 0x170
atapci0: Reserved 0x1 bytes for rid 0x1c type 4 at 0x376
ata1: at 0x170 irq 15 on atapci0
orm0: <Option ROM> at iomem 0xc0000-0xc5fff on isa0
pmtimer0 on isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x64,0x60 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model IntelliMouse, device ID 3
ed0 at port 0x340-0x35f iomem 0xd8000-0xdbfff irq 3 on isa0
ed0: Ethernet address: 00:40:05:71:84:78
type NE2000 (16 bit)
fdc0: <Enhanced floppy controller (i82077, NE72065 or clone)> at port
0x3f7,0x3f0-0x3f5 irq 6 drq 2 on isa0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/8 bytes threshold
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
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
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
ata2: <Generic ESDI/IDE/ATA controller> at port 0x36e-0x36f,0x168-0x16f
irq 10 on isa0
unknown: <PNP0303> can't assign resources (port)
unknown: <PNP0f13> can't assign resources (irq)
unknown: <PNP0700> can't assign resources (port)
unknown: <PNP0500> can't assign resources (port)
unknown: <PNP0401> can't assign resources (port)
Timecounter "TSC" frequency 166194274 Hz quality 800
Timecounters tick every 10.000 msec
ad0: 9671MB <WDC AC310100B> [19650/16/63] at ata0-master WDMA2
acd0: CDRW <IOMEGA CDRW6400INT> at ata1-slave PIO4
Mounting root from ufs:/dev/ad0s1a


MPTable, version 2.0.15

 looking for EBDA pointer @ 0x040e, found, searching EBDA @ 0x0009fc00
 searching CMOS 'top of mem' @ 0x0009f800 (638K)
 searching default 'top of mem' @ 0x0009fc00 (639K)
 searching BIOS @ 0x000f0000

 MP FPS found in BIOS @ physical addr: 0x000fae40


MP Floating Pointer Structure:

  location:                     BIOS
  physical address:             0x000fae40
  signature:                    '_MP_'
  length:                       16 bytes
  version:                      1.1
  checksum:                     0x9d
  mode:                         Virtual Wire


MP Config Table Header:

  physical address:             0x0009fd00
  signature:                    ''
  base table length:            0
  version:                      1.0
  checksum:                     0x00
  OEM ID:                       'c<9E>'
  Product ID:                   '0<E6>  '
  OEM table pointer:            0x800001e4
  OEM table size:               0
  entry count:                  21
  local APIC address:           0xfee00000
  extended table length:        0
  extended table checksum:      0


MP Config Base Table Entries:

Processors:     APIC ID Version State           Family  Model   Step
                 0       0x10    BSP, usable     5       2       12
                 1       0x10    AP, usable      5       2       12
Bus:            Bus ID  Type
                 0       PCI
                 1       EISA
I/O APICs:      APIC ID Version State           Address
                14       0x11    usable          0xfec00000
I/O Ints:       Type    Polarity    Trigger     Bus ID   IRQ    APIC ID
                INT      conforms    conforms        1     1         14
                INT      conforms    conforms        1     0         14
                INT      conforms    conforms        1     3         14
                INT      conforms    conforms        1     4         14
                INT      conforms    conforms        1     5         14
                INT      conforms    conforms        1     6         14
                INT      conforms    conforms        1     7         14
                INT      conforms    conforms        1     8         14
                INT      conforms    conforms        1     9         14
                INT      conforms    conforms        1    10         14
                INT      conforms    conforms        1    11         14
                INT      conforms    conforms        1    12         14
                INT      conforms    conforms        1    13         14
                INT      conforms    conforms        1    14         14
                INT      conforms    conforms        1    15         14
Local Ints:     Type    Polarity    Trigger     Bus ID   IRQ    APIC ID
                NMI      conforms    conforms        0   0:A        255


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