I managed to take qemu's cirrus SVGA chip emulation and make it work with UAE using some software duct tape.
Currently attempts to emulates Picasso II board (easiest to debug, driver source is available)
Switching to 640x480x256 mode seems to work, cirrus chip emulation returns correct mode information.
Very important missing piece is actually showing the emulated graphics data... (And when/if it works, it probably shows that graphics are totally garbled..)
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