There are only two ways to clear the Foreign Configuration:  1) in the CTRL-R utility for the PERC, or 2) using the OpenManage Server Administrator software (OMSA, Storage, PERC, Information/Configuration (link at top of page), then Foreign/Clear from the dropdown menu of available tasks for the controller.
I have a server that has a Perc 6/i controller.  I had to replace several drives in my Raid 5 because of an error with exchange (which oddly seem to fix) but doing so I did not take out my hot spare.  While the hot spare was rebuilding I stopped it and then put in the drive that was supposed to be it's replacement.  Of course this put the drive into a foreign state with only the options to blink/unblink.  I have taken the drive out hooked it up to another computer and deleted the data but that did not help.  Is there a way to clear the foreign state of the drive with out going into the controller card?  Thanks
Perc 6/i foreign state drive