[Bug 259673] ichwd does not detect qemu i6300esb virtual watchdog

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259673

--- Comment #2 from christi@coraline.org ---
chip=0x25a18086 is not present.  This may be because QEMU does not emulate the
entire i8300ESD chipset, just the watchdog device.  If ichwd is detecting by
searching for the chipset rather than the watchdog specifically, that could
explain why it is not being detected?

Full output from pciconf -v -l is:

hostb0@pci0:0:0:0:      class=0x060000 rev=0x02 hdr=0x00 vendor=0x8086
device=0x1237 subvendor=0x1af4 subdevice=0x1100
    vendor     = 'Intel Corporation'
    device     = '440FX - 82441FX PMC [Natoma]'
    class      = bridge
    subclass   = HOST-PCI
isab0@pci0:0:1:0:       class=0x060100 rev=0x00 hdr=0x00 vendor=0x8086
device=0x7000 subvendor=0x1af4 subdevice=0x1100
    vendor     = 'Intel Corporation'
    device     = '82371SB PIIX3 ISA [Natoma/Triton II]'
    class      = bridge
    subclass   = PCI-ISA
atapci0@pci0:0:1:1:     class=0x010180 rev=0x00 hdr=0x00 vendor=0x8086
device=0x7010 subvendor=0x1af4 subdevice=0x1100
    vendor     = 'Intel Corporation'
    device     = '82371SB PIIX3 IDE [Natoma/Triton II]'
    class      = mass storage
    subclass   = ATA
uhci0@pci0:0:1:2:       class=0x0c0300 rev=0x01 hdr=0x00 vendor=0x8086
device=0x7020 subvendor=0x1af4 subdevice=0x1100
    vendor     = 'Intel Corporation'
    device     = '82371SB PIIX3 USB [Natoma/Triton II]'
    class      = serial bus
    subclass   = USB
intsmb0@pci0:0:1:3:     class=0x068000 rev=0x03 hdr=0x00 vendor=0x8086
device=0x7113 subvendor=0x1af4 subdevice=0x1100
    vendor     = 'Intel Corporation'
    device     = '82371AB/EB/MB PIIX4 ACPI'
    class      = bridge
vgapci0@pci0:0:2:0:     class=0x030000 rev=0x02 hdr=0x00 vendor=0x1234
device=0x1111 subvendor=0x1af4 subdevice=0x1100
    class      = display
    subclass   = VGA
virtio_pci0@pci0:0:3:0: class=0x00ff00 rev=0x00 hdr=0x00 vendor=0x1af4
device=0x1002 subvendor=0x1af4 subdevice=0x0005
    vendor     = 'Red Hat, Inc.'
    device     = 'Virtio memory balloon'
    class      = old
none0@pci0:0:4:0:       class=0x088000 rev=0x00 hdr=0x00 vendor=0x8086
device=0x25ab subvendor=0x1af4 subdevice=0x1100
    vendor     = 'Intel Corporation'
    device     = '6300ESB Watchdog Timer'
    class      = base peripheral
virtio_pci1@pci0:0:5:0: class=0x010000 rev=0x00 hdr=0x00 vendor=0x1af4
device=0x1004 subvendor=0x1af4 subdevice=0x0008
    vendor     = 'Red Hat, Inc.'
    device     = 'Virtio SCSI'
    class      = mass storage
    subclass   = SCSI
virtio_pci2@pci0:0:18:0:        class=0x020000 rev=0x00 hdr=0x00 vendor=0x1af4
device=0x1000 subvendor=0x1af4 subdevice=0x0001
    vendor     = 'Red Hat, Inc.'
    device     = 'Virtio network device'
    class      = network
    subclass   = ethernet
pcib1@pci0:0:30:0:      class=0x060400 rev=0x00 hdr=0x01 vendor=0x1b36
device=0x0001 subvendor=0x0000 subdevice=0x0000
    vendor     = 'Red Hat, Inc.'
    device     = 'QEMU PCI-PCI bridge'
    class      = bridge
    subclass   = PCI-PCI
pcib2@pci0:0:31:0:      class=0x060400 rev=0x00 hdr=0x01 vendor=0x1b36
device=0x0001 subvendor=0x0000 subdevice=0x0000
    vendor     = 'Red Hat, Inc.'
    device     = 'QEMU PCI-PCI bridge'
    class      = bridge
    subclass   = PCI-PCI

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