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YosysHQ / picorv32

PicoRV32 - A Size-Optimized RISC-V CPU
ISC License
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IceStorm compatibility? #77

Closed sunnystormy closed 6 years ago

sunnystormy commented 6 years ago

Heya!

Wanted to reach out and see if this would be compatible with a BlackIce board? I'd love to use the IceStorm tools to get this running!

Thank you!

cliffordwolf commented 6 years ago

It is compatible witrh IceStorm of course. For example the demo for picosoc is an iCE40 HX8K design that being built with icestorm.

I don't know if there is an already existing picorv32/picosoc design for the BlackIce board, but since the board features a iCE40HX4K (which is just a 8k with a different label) I see no inherent issue with getting picorv32 work on that board.

ndbroadbent commented 5 years ago

Hi @cliffordwolf, I'm also interested in running picorv32 on an iCE40 FPGA. I saw this in the README: "Small (750-2000 LUTs)". So I was wondering if you can build a minimal version that will run on an iCE40HX1K with 1,280 LUTs?

Chip LUTs
iCE40HX1K 1,280
iCE40HX4K 3,520
iCE40HX8K 7,680

(From this iCE40 datasheet.)

I'm collecting some information to update my post on /r/FPGA about development boards. I've been looking at this affordable Go Board ($65), which has an iCE40HX1K. I'm just trying to get a sense of what you can do with it. It looks like it can run most of the soft-core CPU designs I've found, but only the stripped-down versions without too many features.