I have SF1,SF2,SF2 New Challengers, SF2 Turbo, SF2 Hyper fighting, they all run/play on mame ok...
Load up clrmamepro and import the clrmamepro.dat from the gp2xmame folder, create empty roms folder on hdd somewhere, point to this in clrmamepro settings, scan the roms (they will be empty), then...