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-rw-r--r--techlibs/ecp5/synth_ecp5.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/techlibs/ecp5/synth_ecp5.cc b/techlibs/ecp5/synth_ecp5.cc
index 80aa1dbc5..a79dee31f 100644
--- 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");
}