freebsd stable - Sep 2005 - 6300ESB watch-dog timer/apic support?

I have a system with a Supermicro X6DAL-G main-board on which I'm running
RELENG_5_4.  The following are from the output of `pciconf -vl`:

none0@pci0:29:4:        class=0x088000 card=0x668015d9 chip=0x25ab8086 
rev=0x02 hdr=0x00
    vendor   = 'Intel Corporation'
    device   = '6300ESB Watchdog Timer'
    class    = base peripheral
none1@pci0:29:5:        class=0x080020 card=0x00000000 chip=0x25ac8086 
rev=0x02 hdr=0x00
    vendor   = 'Intel Corporation'
    device   = '6300ESB APIC1'
    class    = base peripheral
    subclass = interrupt controller

I haven't had much luck finding out how to attach to these.  Is there
support at all?  Perhaps in -CURRENT?