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-rw-r--r--passes/techmap/techmap.cc5
1 files changed, 4 insertions, 1 deletions
diff --git a/passes/techmap/techmap.cc b/passes/techmap/techmap.cc
index 4c5a0feb..cb36c9e1 100644
--- a/passes/techmap/techmap.cc
+++ b/passes/techmap/techmap.cc
@@ -243,6 +243,9 @@ struct TechmapWorker
RTLIL::Module *tpl = map->modules[tpl_name];
std::map<RTLIL::IdString, RTLIL::Const> parameters = cell->parameters;
+ if (tpl->get_bool_attribute("\\blackbox"))
+ continue;
+
if (!flatten_mode)
{
if (tpl->get_bool_attribute("\\techmap_simplemap")) {
@@ -686,7 +689,7 @@ struct FlattenPass : public Pass {
if (top_mod != NULL) {
std::map<RTLIL::IdString, RTLIL::Module*> new_modules;
for (auto &mod_it : design->modules)
- if (mod_it.second == top_mod) {
+ if (mod_it.second == top_mod || mod_it.second->get_bool_attribute("\\blackbox")) {
new_modules[mod_it.first] = mod_it.second;
} else {
log("Deleting now unused module %s.\n", RTLIL::id2cstr(mod_it.first));