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> > 	here's openbsd's dmesg.  it apparently touches function 1 of
> > 	SC1100 device, but does not panic like netbsd does.
> Digging deeper into the SC1100 manual, I found an interesting
> register. Page 169 of SC1100.pdf from National Semiconductor:
> 
> "Table 5-29. F0: PCI Header and Bridge Configuration for GPIO and LPC
> Support
> 
> Index 41h       PCI Function Control Register 2 (R/W) Reset Value: 00h
> 
> Bit     Description
> ...
> 1       Power Management Configuration Trap.
>         If this bit is set to 1 and an access occurs to one of the
>         configuration resisters in PCI function 1 (F1) register space,
>         an SMI is generated."
> 
> (other bits exist to trap accesses to IDE (F2), "XpressAUDIO" (F3),
> and legacy ISA I/O space).
> 
> Given the existence of this register, it seems possible that NetBSD is
> setting (or OpenBSD and FreeBSD are clearing) that bit, or perhaps are
> set up to handle SMI differently. A little code in
> sys/arch/i386/pci/pchb.c or, if it's booted, "pcictl /dev/pci0 dump -d
> 0 -f 0" would be informative.

	attached output when booted with "skip function 1" quirk.
	yes, offset 0x41 has bit 1 set, i.e. SMI gets generated if function 1
	is touched.  hmm, should we clear the bit in
	sys/arch/i386/i386/identcpu.c?  or is it a BIOS issue?  are there any
	people having the similar simptom with non-soekris4801 machines w/
	SC1100 CPU?

itojun

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PCI configuration registers:
  Common header:
    0x00: 0x00011078 0x02800107 0x06000000 0x00001f00

    Vendor Name: Cyrix Corporation (0x1078)
    Device Name: MediaGX Built-in PCI Host Controller (0x0001)
    Command register: 0x0107
      I/O space accesses: on
      Memory space accesses: on
      Bus mastering: on
      Special cycles: off
      MWI transactions: off
      Palette snooping: off
      Parity error checking: off
      Address/data stepping: off
      System error (SERR): on
      Fast back-to-back transactions: off
    Status register: 0x0280
      Capability List support: off
      66 MHz capable: off
      User Definable Features (UDF) support: off
      Fast back-to-back capable: on
      Data parity error detected: off
      DEVSEL timing: medium (0x1)
      Slave signaled Target Abort: off
      Master received Target Abort: off
      Master received Master Abort: off
      Asserted System Error (SERR): off
      Parity error detected: off
    Class Name: bridge (0x06)
    Subclass Name: host (0x00)
    Interface: 0x00
    Revision ID: 0x00
    BIST: 0x00
    Header Type: 0x00 (0x00)
    Latency Timer: 0x1f
    Cache Line Size: 0x00

  Type 0 ("normal" device) header:
    0x10: 0x00000000 0x00000000 0x00000000 0x00000000
    0x20: 0x00000000 0x00000000 0x00000000 0x00000000
    0x30: 0x00000000 0x00000000 0x00000000 0x00000000

    Base address register at 0x10
      not implemented(?)
    Base address register at 0x14
      not implemented(?)
    Base address register at 0x18
      not implemented(?)
    Base address register at 0x1c
      not implemented(?)
    Base address register at 0x20
      not implemented(?)
    Base address register at 0x24
      not implemented(?)
    Cardbus CIS Pointer: 0x00000000
    Subsystem vendor ID: 0x0000
    Subsystem ID: 0x0000
    Expansion ROM Base Address: 0x00000000
    Reserved @ 0x34: 0x00000000
    Reserved @ 0x38: 0x00000000
    Maximum Latency: 0x00
    Minimum Grant: 0x00
    Interrupt pin: 0x00 (none)
    Interrupt line: 0x00

  Device-dependent header:
    0x40: 0x41001c0e 0x00000000 0x00000000 0x00000000
    0x50: 0x00000000 0x00000000 0x00000000 0x00000000
    0x60: 0x00000000 0x00000000 0x00000000 0x00000000
    0x70: 0x00000000 0x00000000 0x00000000 0x00000000
    0x80: 0x00000000 0x00000000 0x00000000 0x00000000
    0x90: 0x00000000 0x00000000 0x00000000 0x00000000
    0xa0: 0x00000000 0x00000000 0x00000000 0x00000000
    0xb0: 0x00000000 0x00000000 0x00000000 0x00000000
    0xc0: 0x00000000 0x00000000 0x00000000 0x00000000
    0xd0: 0x00000000 0x00000000 0x00000000 0x00000000
    0xe0: 0x00000000 0x00000000 0x00000000 0x00000000
    0xf0: 0x00000000 0x00000000 0x00000000 0x00000000


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