Feature Request: Use of a gernic board under yosys

[swittlich]

It is currently not possible to create a pcf file directly. This file must have the name project.pcf and as soon as you open the Pin Planner for the yosys settings and want to save the yosys settings, the project.pcf is emptied.

It would be desirable to be able to select one of several pcf files. But above all, the removal of the board constraint would be important.

I have already implemented this with the CologneChip plugin.