ecp5: Add attrmvcp to copy syn_useioff to driving FF

Signed-off-by: David Shah <dave@ds0.me>

diff --git a/techlibs/ecp5/synth_ecp5.cc b/techlibs/ecp5/synth_ecp5.cc
index 80aa1dbc5acd862885f2d878f644f09c922a03cb..a79dee31f553012189433acdea70779edc2b8089 100644 (file)
--- a/techlibs/ecp5/synth_ecp5.cc
+++ b/techlibs/ecp5/synth_ecp5.cc
@@ -297,6 +297,7 @@ struct SynthEcp5Pass : public ScriptPass
                        run("simplemap");
                        run("ecp5_ffinit");
                        run("ecp5_gsr");
+                       run("attrmvcp -copy -attr syn_useioff");
                        run("opt_clean");
                }