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Icestorm and yosys are cool! Since then even more CPUs are working on ICE40: https://github.com/cliffordwolf/picorv32 https://github.com/cliffordwolf/picorv32

by sklogic 11y ago

Icestorm and yosys are cool! Since then even more CPUs are working on ICE40: https://github.com/cliffordwolf/picorv32 https://github.com/cliffordwolf/picorv32 Or a really small and slow one (smaller than J1, but needs more RAM): https://github.com/combinatorylogic/soc/tree/master/backends/tiny1 https://github.com/combinatorylogic/soc/tree/master/backends...

listic 11y ago
But does it use an open source toolchain? Also, where does it say that it runs on ICE40?
- bri3d 11y ago
  PicoRV32 absolutely runs on iCE40 and the open toolchain. Check out scripts/icestorm and http://www.clifford.at/papers/2015/yosys-icestorm-etc/slides.pdf http://www.clifford.at/papers/2015/yosys-icestorm-etc/slides...
  - gluggymug 11y ago
    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.
ZenoArrow 11y ago
Does the PicoRV32 make use of Xilinx-only features?
- bri3d 11y ago
  http://www.clifford.at/papers/2015/yosys-icestorm-etc/slides.pdf http://www.clifford.at/papers/2015/yosys-icestorm-etc/slides... It runs on the open iCE40 toolchain, so nope.
  - ZenoArrow 11y ago
    It's not particularly clear from the Github page, but thanks for clarifying with the PDF.