A generic patcher for nds games to run from a gba cart has been released.
http://gbatemp.net/index.php?showtopic=27468&st=0
I've got a EFA 512mb, castlevania works (and saves to the efa as well) perfectly.
The only other thing I've tried is Meteos, but that didnt work.
More compatibility listing in that thread.
Cheers,
Jojo
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