>> pci based one in the tree... I'm just unpacking the last -current
>> tar_files I have (Jun27) to see what might be there...
>
>Is the puc driver from -current a good starting point?

Actually .... yes, because judging from the comments from pucdata.c
it already knows how to handle the PLX 9050 chip.  I bet you could
just write a description for pucdata.c and it should "just work"
(finding out what you need to put there might be interesting,
though).

--Ken