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by floatboth 1586 days ago
I don't have that much experience (don't really have many use cases for FPGAs personally tbh) but:

Icestorm is for iCE40, Trellis is for ECP5 (which comes in variants up to 85k LUTs);

the flow is simple enough to do manually but there are things that make it one-click. This tutorial series https://youtube.com/playlist?list=PLEBQazB0HUyT1WmMONxRZn9Nm... uses one.

As for handling really big designs, I don't know.