PCMCIA bridge card won't initialise: 'bad Vcc request', 'cbb_power: 0V'

I've been attempting to turn an old K6-200 machine into a wireless ADSL 
router.    I started out by installing FreeBSD 5.2.1, but decided to 
upgrade to -CURRENT after a few panics.   Under 5.2.1 my wireless card, 
which is installed via a PCI-PCMCIA bridge, worked perfectly.   Now in 
-CURRENT, though, the bridge card fails to initialise: I keep getting:

cbb0: bad Vcc request. ctrl=0xf000ef08, status=0xf000e2c3
cbb_power: 0V

ACPI isn't loaded.    This problem looks similar to bug #66290, but I 
get the message even if no card is plugged in.   Is there anything I 
can do to help diagnose where the bug is?

--
Bruce Cran