support for 85k; 3M baud is unreliable, 9600 baud is better

YosysHQ / prjtrellis

Documenting the Lattice ECP5 bit-stream format.

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Closed BracketMaster closed 2 years ago

BracketMaster commented 2 years ago

I've found 3M baud to be a bit janky on my machine, I image 9600 is just fine for a demo
Added a README with some quick instructions as urjprog may not work - openFPGAloader seems to work better
make separate makefile for 85k vs 12k devices