yosys 0.8 is lacking important features allowing modern designs for Lattice ECP5 FPGAs to be built (in concert with trellis and nextpnr).

Please consider updating f29 through master to a recent git snapshot (e.g., mirror.ini.cmu.edu/gls/SRPMs/yosys-0.9-0.1.20190808gitac2fc3a.fc30.src.rpm).

Also, please consider adding @somlo and @lkundrak (currently co-maintaining trellis and nextpnr) as yosys co-maintainers.