Good Morning, It was very kind of some (surely independent, non-casper) soul to share some deprecated cores necessary for casper compiles with recent versions of Xilinx tools.
It would be nice if whomever is doing this sharing could update the opb core mpd file to support virtex 6 for roach2, but it is a shame that they surely won't get this message on the casper maillist, being certainly not from casper. End-of-musing Jack