diff --git a/driver/tests/basic/Makefile b/driver/tests/basic/Makefile
index 123d657c..1301a9a0 100644
--- a/driver/tests/basic/Makefile
+++ b/driver/tests/basic/Makefile
@@ -1,4 +1,5 @@
 RISCV_TOOL_PATH ?= $(wildcard ~/dev/riscv-gnu-toolchain/drops)
+# RISCV_TOOL_PATH ?= /opt/riscv-new/drops
 VX_RT_PATH ?= $(wildcard ../../../runtime)
 
 VX_CC  = $(RISCV_TOOL_PATH)/bin/riscv32-unknown-elf-gcc
@@ -41,6 +42,9 @@ kernel.elf: $(SRCS)
 $(PROJECT): $(SRCS)
 	$(CXX) $(CXXFLAGS) $^ $(LDFLAGS) -L../../stub -lvortex -o $@
 
+# $(PROJECT): $(SRCS)
+# 	$(CXX) $(CXXFLAGS) $^ $(LDFLAGS) -L../../stub -L../../rtlsim -lvortex -o $@
+
 run-fpga: $(PROJECT)
 	LD_LIBRARY_PATH=../../opae:$(LD_LIBRARY_PATH) ./$(PROJECT)
 
@@ -50,6 +54,9 @@ run-ase: $(PROJECT)
 run-rtlsim: $(PROJECT)
 	LD_LIBRARY_PATH=../../rtlsim:$(LD_LIBRARY_PATH) ./$(PROJECT)
 
+# run-rtlsim: $(PROJECT)
+# 	DYLD_LIBRARY_PATH=../../rtlsim:$(DYLD_LIBRARY_PATH) ./$(PROJECT) -f kernel.bin -n 4
+
 run-simx: $(PROJECT)
 	LD_LIBRARY_PATH=../../simx:$(LD_LIBRARY_PATH) ./$(PROJECT)