I finally found the old VirtualJaguar SDL port source code and i decided to take a look at it.
After backporting some upstream code to it, i managed to fix some graphical bugs in some games.
I then decided to port it to the GCW0 and it ended up running much slower than i expected...
No offense but the Ingenic proc runs like a 300Mhz Pentium 2.
That said, you could still play some games on it.
Wolfenstein 3D is the fastest game to run on VirtualJaguar and is somewhat playable.
Cybermorph works somewhat slowly and is kind of unresponsive.
Atari Karts looks great but runs very slowly.
Bubsy works but only when DSP is disabled, same for Worms.
Power Drive Rally will mess up your screen, don't use it for now.
You can download the emulator here :https://github.com/gameblabla/virtualjaguar-sdl/raw/master/vj.opk
No need for bioses or configuration...
Just put the OPK in /media/data/apps and you're good to go.
Here's Worms (Atari Jaguar version) running on the GCW0.