Looks like it should be possible - the fpga isn't very big, but assuming the luts are equally capable as the ones in a cyclone-iv, it's about comparable to a de0nano. And the winbond sdram should work without any issues, I'd think.
Hooking it up directly to the pidp, sure - if all the right pins are i/o, why not. Not sure about the video (what is GDPI? wikipedia say's it's the pentecostal church in Indonesia?) or about serial i/o for the console. But most likely no issue.
That's the good news, the bad news ism I already have a table full of fpga boards and no room (or money!) for yet another. But if you or anyone else wants to try to port, I'll help where I can. I'm not sure how difficult it would be, the last time I worked with Lattice stuff is about thirty years ago. Yay, my first cpld board. Still have it somewhere.
Sytse
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