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Icestorm and yosys are cool!

Since then even more CPUs are working on ICE40:

Or a really small and slow one (smaller than J1, but needs more RAM): https://github.com/combinatorylogic/soc/tree/master/backends...

But does it use an open source toolchain? Also, where does it say that it runs on ICE40?

PicoRV32 absolutely runs on iCE40 and the open toolchain. Check out scripts/icestorm and http://www.clifford.at/papers/2015/yosys-icestorm-etc/slides...

The target is the iCE40 HX8K according to the slides (p17) not the icestick unfortunately.

It uses 1521 LUTs with Yosys. The icestick is a HX1K which has 1280 LUTs I think.

Does the PicoRV32 make use of Xilinx-only features?

It runs on the open iCE40 toolchain, so nope.

It's not particularly clear from the Github page, but thanks for clarifying with the PDF.