correct the flash tool path

usb-boot/stage1/Makefile

@@ -3,6 +3,7 @@
 #
 # Makefile for the JZ4740 internal bootrom code.
 #
+FLASH_TOOL_PATH = ../../flash-tool
 
 CROSS	:= mipsel-linux-
 
@@ -18,7 +19,7 @@ fw.bin: fw.elf
 	$(CROSS)objdump -D $< > fw.dump
 	$(CROSS)objdump -h $< > fw.map
 	$(CROSS)nm -n $< > System.map
-	cp fw.bin ../../../../tools
+	cp fw.bin $(FLASH_TOOL_PATH)
 
 fw.elf: $(OBJS)
 	$(CROSS)ld $(LDFLAGS) $(OBJS) -o $@

usb-boot/stage2/Makefile

@@ -7,7 +7,7 @@
 # published by the Free Software Foundation.
 # 
 
-# -----------------------------
+FLASH_TOOL_PATH = ../../flash-tool
 
 CC	:= mipsel-linux-gcc
 AR	:= mipsel-linux-ar rcsv
@@ -53,7 +53,7 @@ all:	$(APP)
 	$(OBJDUMP) -D $(APP) > $(TARGET).dump
 	$(NM) $(APP) | sort > $(TARGET).sym
 	$(OBJDUMP) -h $(APP) > $(TARGET).map
-	cp usb_boot.bin ../../../tools
+	cp usb_boot.bin $(FLASH_TOOL_PATH)
 
 $(APP):	$(HEADO) $(OBJS) $(EXTLIBS) 
 	$(CC) $(LDFLAGS) $^ -o $@