AFAIK, FIM 2010 R2 runs only on WSS and SP Foundation 2010 (Requirements); FIM 2010 R2 SP1 supports upgrading to SP Foundation 2013 (Release
Notes). I have never heard of anyone trying to install FIM on an existing Sharepoint 2010 farm and I doubt that it is feasible, let alone supported.
1) I believe you can create a farm with SPF 2010 that you can run FIM on, though you would not be able to install it into an existing SharePoint Farm - not sure about an existing SharePoint Foundation 2010 farm.
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