diff --git a/nemu/.config b/nemu/.config
new file mode 100644
index 0000000..aa26803
--- /dev/null
+++ b/nemu/.config
@@ -0,0 +1,74 @@
+#
+# Automatically generated file; DO NOT EDIT.
+# NEMU Configuration Menu
+#
+# CONFIG_ISA_x86 is not set
+# CONFIG_ISA_mips32 is not set
+CONFIG_ISA_riscv=y
+# CONFIG_ISA_loongarch32r is not set
+CONFIG_ISA="riscv32"
+
+#
+# ISA-dependent Options for riscv
+#
+# CONFIG_RV64 is not set
+# CONFIG_RVE is not set
+# end of ISA-dependent Options for riscv
+
+CONFIG_ENGINE_INTERPRETER=y
+CONFIG_ENGINE="interpreter"
+CONFIG_MODE_SYSTEM=y
+CONFIG_TARGET_NATIVE_ELF=y
+# CONFIG_TARGET_SHARE is not set
+# CONFIG_TARGET_AM is not set
+
+#
+# Build Options
+#
+CONFIG_CC_GCC=y
+# CONFIG_CC_GPP is not set
+# CONFIG_CC_CLANG is not set
+CONFIG_CC="gcc"
+# CONFIG_CC_O0 is not set
+# CONFIG_CC_O1 is not set
+CONFIG_CC_O2=y
+# CONFIG_CC_O3 is not set
+CONFIG_CC_OPT="-O2"
+# CONFIG_CC_LTO is not set
+# CONFIG_CC_DEBUG is not set
+CONFIG_CC_ASAN=y
+# end of Build Options
+
+#
+# Testing and Debugging
+#
+CONFIG_TRACE=y
+CONFIG_TRACE_START=0
+CONFIG_TRACE_END=10000
+CONFIG_ITRACE=y
+CONFIG_ITRACE_COND="true"
+# CONFIG_DIFFTEST is not set
+CONFIG_DIFFTEST_REF_PATH="none"
+CONFIG_DIFFTEST_REF_NAME="none"
+# end of Testing and Debugging
+
+#
+# Memory Configuration
+#
+CONFIG_MBASE=0x80000000
+CONFIG_MSIZE=0x8000000
+CONFIG_PC_RESET_OFFSET=0
+# CONFIG_PMEM_MALLOC is not set
+CONFIG_PMEM_GARRAY=y
+CONFIG_MEM_RANDOM=y
+# end of Memory Configuration
+
+# CONFIG_DEVICE is not set
+
+#
+# Miscellaneous
+#
+CONFIG_TIMER_GETTIMEOFDAY=y
+# CONFIG_TIMER_CLOCK_GETTIME is not set
+CONFIG_RT_CHECK=y
+# end of Miscellaneous
diff --git a/nemu/flake.nix b/nemu/flake.nix
index 325421f..e70f447 100644
--- a/nemu/flake.nix
+++ b/nemu/flake.nix
@@ -54,7 +54,13 @@
             echo NEMU_HOME=$NEMU_HOME
             echo pwd=$(pwd)
             mkdir -p $(pwd)/kconfig
-            WORK_DIR=$(pwd) obj=$(pwd)/kconfig make --trace -e -f scripts/config.mk WORK_DIR=$(pwd) obj=$(pwd)/kconfig rv32_defconfig
+          '';
+            # WORK_DIR=$(pwd) obj=$(pwd)/kconfig make --trace -e -f scripts/config.mk WORK_DIR=$(pwd) obj=$(pwd)/kconfig rv32_defconfig
+
+          buildPhase = ''
+            mkdir -p $out
+            ls $out
+            BUILD_DIR=$out make --trace
           '';
 
           installPhase = ''
diff --git a/nemu/tools/kconfig/Makefile b/nemu/tools/kconfig/Makefile
index d853482..e29b038 100644
--- a/nemu/tools/kconfig/Makefile
+++ b/nemu/tools/kconfig/Makefile
@@ -32,6 +32,7 @@ $(obj)/parser.tab.c $(obj)/parser.tab.h: parser.y
 	@bison -v $< --defines=$(obj)/parser.tab.h -o $(obj)/parser.tab.c
 
 conf:
+	@ldconfig -v
 	@$(MAKE) -s
 
 mconf: