For the Eight board, my cgminer.conf file uses
"drillbit-options" : "Eight:int:53:2:950",
"usb" : ":1"
(the "usb": part tells it to look just for 1 device)
For the Av16 boards the conf file has
"drillbit-options" : "Av16:int:750:1:1000",
"usb" : ":1"
(again, cgminer sees this 'bunch' as a single USB device).
The 'Eight' or 'Av16' tells this instance which device type to apply this for. I just happen to use different versions of cgminer for these 2 (currently running 4 instances of cgminer and 2 of bfgminer on the same pc to control a garden variety of miners including Drillbit Thumbs (bf), Drillbit AvThumbs, Drillbit Eight, Drillbit Av16's, Blue/Red Fury, Antminer U1/2's...
Cheers
running something close to that, what setting would i need to ignore any and all other devices?
ed. --drillbit-options Eight:int:52:2:950,Av16:int:725:1:100 seems to work for the 5 8baords and the two av16 :-)