diff --git a/chisel/Makefile b/chisel/Makefile
index 11ddf06..d80e679 100644
--- a/chisel/Makefile
+++ b/chisel/Makefile
@@ -1,6 +1,6 @@
 BUILD_DIR = ./build
 DIFF_DIR = ../difftest/core
-DIFF_WORK_DIR = ../difftest/test/test_workbench/sim
+DIFF_WORK_DIR = ../difftest/test/sim
 
 export PATH := $(PATH):$(abspath ./utils)
 
@@ -9,10 +9,10 @@ verilog:
 	mkdir -p $(BUILD_DIR)
 	mill -i __.test.runMain Elaborate -td $(BUILD_DIR)
 
-# func:
-# 	$(MAKE) verilog
-# 	cp $(BUILD_DIR)/PuaCpu.v $(DIFF_DIR)
-# 	cd $(DIFF_WORK_DIR) && make func
+func:
+	$(MAKE) verilog
+	cp $(BUILD_DIR)/PuaCpu.v $(DIFF_DIR)
+	cd $(DIFF_WORK_DIR) && make func
 
 test:
 	@echo "make test"
diff --git a/difftest b/difftest
index 1cc25d6..2207e5e 160000
--- a/difftest
+++ b/difftest
@@ -1 +1 @@
-Subproject commit 1cc25d6abc214775b47d467b8fb16ceed814ffd6
+Subproject commit 2207e5e02ef77abe5d48fdf8ec2174107cc05c1d