unrecognized pci-serial board

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I installed a pci-serial board to my freebsd box.
But it doesn't seem to be recognized.

dmesg yields this line
>pci3: <simple comms, UART> at device 3.0 (no driver attached)

pciconf -lv yieds
>none3 at pci3:3:0: class=0x070002 card=0x60011195 chip=0x015213a8 rev=0x01
hdr=0x00
>    vendor   = 'Exar Corp.'
>    class    = simple comms
>    subclass = UART

I thought that maybe it was a uart or puc device and recompiled the kernel
and rebooted.
But the board is still unrecognized.

Is there anything I can do?

TIA,
Tomoki Taniguchi