Serial port config..

[Wojciech Puchar]

> ad0: 38182MB <MAXTOR 4K040H2 A08.1500> at ata0-master UDMA100
> ad1: 19092MB <IC35L020AVER07 0 ER2OA41A> at ata0-slave UDMA100
> acd0: CDROM <CRD-8482B/1.05> at ata1-master UDMA33
> SMP: AP CPU #1 Launched!
> GEOM_LABEL: Label for provider acd0 is iso9660/CARD07C.
> Trying to mount root from ufs:/dev/ad1s1a
> em0: link state changed to UP
> drm0: <Intel i865G GMCH> on vgapci0
> info: [drm] AGP at 0xe8000000 128MB
> info: [drm] Initialized i915 1.5.0 20060119
> drm0: [ITHREAD]

i don't see any "puc" line in your config. looks like not supported, but 
usually all support is a matter of adding few lines to code or maybe just 
PCI data