I've tried the upload command with various verbose settings. Interestingly the --verbose-arachne fails.
I do :
apio upload --verbose-arachne
Error: no such option: --verbose-arachne
-v, and --verbose-yosys complete without errors, but my design is not getting uploaded. I can see in these modes that the blackice-prog is appropriately addressed.
Perhaps something is wrong with arachne-pnr?