You will need to recreate the UV map for it: select everything less the hole and apply a planar projection to it. The hole will need to have a different UVmap. A good way is to create two shader domains, one for the hole and other fot the wall.

Benney is right about the hole problem, the best pratice in modleing is to use extrude or bevel to model the hole... never use booleans.

http://youtu.be/9F_bjHVYr5I

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