New port: devel/lattice-ice40-tools

Metaport which enables a fully open source Verilog-to-Bitstream
flow for iCE40 FPGAs.

WWW: http://www.clifford.at/icestorm

PR: 227592
Submitted by: Johnny Sorocil <jsorocil@gmail.com>
Differential Revision: https://reviews.freebsd.org/D15632