[Flow] Add comments to clarify the limitations
@@ -45,6 +45,7 @@ share
opt -nodffe -nosdff
fsm
# Run a quick follow-up optimization to sweep out unused nets/signals
+# FIXME: In Yosys v0.10, when options '-nodffe' and '-nosdff' is on, some dual-port ram cannot be inferred correctly
opt -fast #-nodffe -nosdff
# Optimize any memory cells by merging share-able ports and collecting all the ports belonging to memorcy cells
memory -nomap
