Thinking it may be my Daniela (v1.2.0) installation, I tried reflashing last night to Elanor (v1.2.1b), with identical results (e.g.hciconfig shows the device, with address all zeroes).
I then reflashed to pdaxrom-1.0.5, where I saw entirely new behaviour:
When inserting the card the light flashed momentarily then went off. I used xcardctl to enable the card, then "hciattach /dev/ttS0 bcsp" enables hciconfig to show the correct information so I suspect the card works but the Cacko roms are incompatible.
I'll post a summary in the Cacko forums.