1 files changed, 8 insertions, 0 deletions
diff --git a/common/placer_heap.cc b/common/placer_heap.cc
index dbb8d36c..27144316 100644
--- a/common/placer_heap.cc
+++ b/common/placer_heap.cc
@@ -401,6 +401,14 @@ class HeAPPlacer
         // Initial constraints placer
         for (auto &cell_entry : ctx->cells) {
             CellInfo *cell = cell_entry.second.get();
+
+            if (cell->bel != BelId()) {
+                if (ctx->verbose)
+                    log_error("Cell \'%s\' (%s) has already been constrianed by arch implementation",
+                              cell->name.c_str(ctx), cell->type.c_str(ctx));
+                continue;
+            }
+
             auto loc = cell->attrs.find(ctx->id("BEL"));
             if (loc != cell->attrs.end()) {
                 std::string loc_name = loc->second.as_string();