One correction to the fill generation; otherwise, the top level
layout gets an ID layer dropped on it that's not supposed to be
there.
diff --git a/sky130/custom/scripts/generate_fill.py b/sky130/custom/scripts/generate_fill.py
index 74b0c36..943920c 100755
--- a/sky130/custom/scripts/generate_fill.py
+++ b/sky130/custom/scripts/generate_fill.py
@@ -250,6 +250,7 @@
print('gets $ifile xbase', file=ofile)
print('gets $ifile ybase', file=ofile)
print('close $ifile', file=ofile)
+ print('cif ostyle wafflefill(tiled)', file=ofile)
# Now create simple "fake" views of all the tiles.
print('gds readonly true', file=ofile)
