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-rw-r--r--ice40/pack.cc3
1 files changed, 3 insertions, 0 deletions
diff --git a/ice40/pack.cc b/ice40/pack.cc
index fc182e98..9700bc5d 100644
--- a/ice40/pack.cc
+++ b/ice40/pack.cc
@@ -26,6 +26,7 @@
#include "design_utils.h"
#include "log.h"
#include "util.h"
+#include "chains.h"
NEXTPNR_NAMESPACE_BEGIN
@@ -893,6 +894,8 @@ bool Arch::pack()
pack_ram(ctx);
pack_special(ctx);
ctx->assignArchInfo();
+ constrain_chains(ctx);
+ ctx->assignArchInfo();
log_info("Checksum: 0x%08x\n", ctx->checksum());
return true;
} catch (log_execution_error_exception) {