diff --git a/.gitignore b/.gitignore
index b0c0623..ee5c198 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,5 +5,6 @@ dep/
 *.bin
 *.ub
 boot/loader
+*.d
 tools/mksfs
 .gdb_history
diff --git a/Makefile b/Makefile
index d2ed414..76902a7 100644
--- a/Makefile
+++ b/Makefile
@@ -83,12 +83,21 @@ BUILD_DIR   += $(USER_OBJDIR)
 
 DEPENDS := $(patsubst $(SRCDIR)/%.c, $(DEPDIR)/%.d, $(SRC))
 
-.PHONY: all checkdirs clean 
+
+CONFIG_FILE := .config_$(ON_FPGA)_$(EN_INT)_$(EN_TLB)
+
+.PHONY: all checkdirs clean qemu
 
 all: checkdirs boot/loader.bin obj/ucore-kernel-initrd
 
 $(shell mkdir -p $(DEP_DIR))
 
+$(CONFIG_FILE):
+	@rm -f .config_*
+	touch $@
+
+qemu: obj/ucore-kernel-initrd
+	qemu-system-mipsel -M mipssim -m 32M -nographic -kernel $< -monitor none -serial stdio
 
 obj/ucore-kernel:   $(OBJ) tools/kernel.ld
 	@echo LINK $@
@@ -99,15 +108,15 @@ obj/ucore-kernel-piggy: $(BUILD_DIR)  $(OBJ) $(USER_APP_BINS) tools/kernel.ld
 	$(LD) $(LDFLAGS_SCRIPT) $(OBJ) \
 					$(addsuffix .piggy.o, $(USER_APP_BINS)) -o $@
 
-$(DEPDIR)/%.d: $(SRCDIR)/%.c
+$(DEPDIR)/%.d: $(SRCDIR)/%.c $(CONFIG_FILE)
 	@echo DEP $<
 	@set -e; rm -f $@; \
 		$(CC) -MM -MT "$(OBJDIR)/$*.o $@" $(CFLAGS) $(INCLUDES) $< > $@; 
 
-$(OBJDIR)/%.o: $(SRCDIR)/%.c
+$(OBJDIR)/%.o: $(SRCDIR)/%.c $(CONFIG_FILE)
 	$(CC) -c -mips1 $(INCLUDES) $(CFLAGS) $(MACH_DEF) $<  -o $@
 
-$(OBJDIR)/%.o: $(SRCDIR)/%.S
+$(OBJDIR)/%.o: $(SRCDIR)/%.S $(CONFIG_FILE)
 	$(CC) -c -mips32 -D__ASSEMBLY__ $(MACH_DEF) $(INCLUDES) $(CFLAGS) $< -o $@
 
 checkdirs: $(BUILD_DIR) $(DEP_DIR)
diff --git a/debug b/debug
deleted file mode 100755
index 2eb48d7..0000000
--- a/debug
+++ /dev/null
@@ -1,6 +0,0 @@
-#!/bin/sh
-
-../qemu-thumips/bin/qemu-system-mipsel -M mipssim -m 32M -serial stdio -bios boot/loader.bin -S -s &
-sleep 1
-gnome-terminal -e "mips-sde-elf-gdb"
-
diff --git a/run b/run
deleted file mode 100755
index a724ad3..0000000
--- a/run
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/bin/sh
-
-../qemu-thumips/bin/qemu-system-mipsel -M mipssim -m 32M -serial stdio -bios boot/loader.bin
-