Google is your friend...
http://yabause.sourceforge.net/ is a very good Saturn-Emulator, which is even ported to the Dreamcast! I'm using it from time to time under Linux, where it runs great. But I don't think that this thinggie is going to work with our GP2x...
Thanks for the link. I did Google it but the problem is that there are several emulators out there, but not all of them say whether they actually run anything other than simple homebrew and so I'm hoping for source to one that is fairly complete. Also, it is not always known how new a version is verses what the latest version is. The two binaries on my computer are SSF and Satourne. It can be hit and miss which one will work with which game but they are the two I try.
I certainly did not want to start a "Saturn on GP2X" thread but I was only suggesting that if I get it going on a different ARM platform that someone might want to check it out for their own fun on GP2X nothing more.