Yosys error: can't guess frontend for input file

Andy · July 6, 2024, 1:57am

Hi, I just started with the Alchitry Cu and Alchitry labs 2.0.9 on Windows 11. When I try to build a simple project to drive the LEDs with some buttons, I get the following error from yosys and it exits with status 1. I get there by setting the toolchain to Yosys and clicking the build button.

ERROR: Can’t guess frontend for input file `Learning\gsw_fpgas\chapter2\switches_to_leds\build\alchitry.json -top MI_alchitryTop’ (missing -f option)!

Does anyone know how to troubleshoot or fix this issue? Thanks!

alchitry · July 9, 2024, 7:35pm

This sounds like a bug. I opened an issue for it here Yosys error: can’t guess frontend for input file · Issue #8 · alchitry/Alchitry-Labs-V2 · GitHub

I’ll be working on Alchitry Labs tomorrow and I’ll look into this.

alchitry · July 10, 2024, 7:02pm

This issue shows up if you have a space in your project’s path or name. I’m looking into a fix.

Edit: Found a fix so it’ll be fixed in 1.0.10.

Andy · July 14, 2024, 10:31pm

Removing the space from the file path did indeed allow Yosys to run, but now I am running into a new error in the build process. Any ideas?

alchitry · July 19, 2024, 3:39pm

I ran into this error once and reinstalling Alchitry Labs fixed it for me. Not 100% sure what caused it.