diff --git a/Ubiquitous/XiZi_AIoT/services/drivers/Makefile b/Ubiquitous/XiZi_AIoT/services/drivers/Makefile
index e53a14564..00581353f 100644
--- a/Ubiquitous/XiZi_AIoT/services/drivers/Makefile
+++ b/Ubiquitous/XiZi_AIoT/services/drivers/Makefile
@@ -1,4 +1,4 @@
 
-SRC_DIR :=  $(BOARD) rk-3568
+SRC_DIR :=  $(BOARD) usb
 
 include $(KERNEL_ROOT)/compiler.mk
diff --git a/Ubiquitous/XiZi_AIoT/services/drivers/usb/Makefile b/Ubiquitous/XiZi_AIoT/services/drivers/usb/Makefile
index 73ea8fa3a..888b55863 100644
--- a/Ubiquitous/XiZi_AIoT/services/drivers/usb/Makefile
+++ b/Ubiquitous/XiZi_AIoT/services/drivers/usb/Makefile
@@ -1,3 +1,3 @@
-SRC_DIR := components libusb 
+SRC_DIR := components
 
 include $(KERNEL_ROOT)/compiler.mk
diff --git a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/Makefile b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/Makefile
index d66f6dec2..be8aa893a 100644
--- a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/Makefile
+++ b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/Makefile
@@ -1,33 +1,17 @@
-include $(KERNEL_ROOT)/services/drivers/usb/components/usb.mk
+
+# usb_core = usbh_core.o
 
 
-usb_class = usbh_hub.o \
-	    usbh_rndis.o \
-	    rndis_host.o
+# libserial = $(KERNEL_ROOT)/services/app/libserial.o
+# printf = $(KERNEL_ROOT)/services/app/printf.o
+# libmem = $(KERNEL_ROOT)/services/app/libmem.o
+# usyscall = $(KERNEL_ROOT)/services/app/usyscall.o 
+# arch_usyscall = $(KERNEL_ROOT)/services/app/arch_usyscall.o
+# session = $(KERNEL_ROOT)/services/app/session.o
+# libipc = $(KERNEL_ROOT)/services/app/libipc.o
+# libsem = $(KERNEL_ROOT)/services/app/libsemaphore.o
 
-usb_common = usb_common.o 
-
-usb_core = usbh_core.o
-
-usb_osal = usb_osal.o
-
-usb_port = usb_hc_xhci.o
-
-
-libserial = $(KERNEL_ROOT)/services/app/libserial.o
-printf = $(KERNEL_ROOT)/services/app/printf.o
-libmem = $(KERNEL_ROOT)/services/app/libmem.o
-usyscall = $(KERNEL_ROOT)/services/app/usyscall.o 
-arch_usyscall = $(KERNEL_ROOT)/services/app/arch_usyscall.o
-session = $(KERNEL_ROOT)/services/app/session.o
-libipc = $(KERNEL_ROOT)/services/app/libipc.o
-libsem = $(KERNEL_ROOT)/services/app/libsemaphore.o
-
-
-SRC_DIR += common
-SRC_DIR += class class/cdc class/hub class/wireless
-SRC_DIR += core
-SRC_DIR += osal
-SRC_DIR += port port/xhci
+SRC_DIR := core
 
 
+include $(KERNEL_ROOT)/compiler.mk
\ No newline at end of file
diff --git a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/core/Makefile b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/core/Makefile
new file mode 100644
index 000000000..6f0429a43
--- /dev/null
+++ b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/core/Makefile
@@ -0,0 +1,11 @@
+include $(KERNEL_ROOT)/services/drivers/usb/components/usb.mk
+
+objs = usbh_core.o
+
+all: ${objs} 
+	@echo "generate $^"
+	@mv $^ $(KERNEL_ROOT)/services/drivers/usb/components
+
+%.o: %.c
+	@echo "cc $^"
+	@${cc} ${cflags} ${c_useropts} ${INC_DIR} -o $@ -c $^
diff --git a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/core/usbh_core.c b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/core/usbh_core.c
index b36a10161..fe55b3de6 100644
--- a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/core/usbh_core.c
+++ b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/core/usbh_core.c
@@ -1 +1,7 @@
 #include "usbh_core.h"
+// #include "libserial.h"
+
+int main(){
+//    printf("++++++++++++++++++");
+    return 0;
+}
\ No newline at end of file
diff --git a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/usb.mk b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/usb.mk
index 20b0a3da9..a77bc089c 100644
--- a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/usb.mk
+++ b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/usb.mk
@@ -13,7 +13,7 @@ cc = ${toolchain}gcc
 ld = ${toolchain}g++
 objdump = ${toolchain}objdump
 
-c_useropts = -O2
+c_useropts = -O0
 
 
 INC_DIR = 	-I$(KERNEL_ROOT)/services/drivers/usb/components \
@@ -33,3 +33,6 @@ INC_DIR = 	-I$(KERNEL_ROOT)/services/drivers/usb/components \
 		-I$(KERNEL_ROOT)/services/lib/usyscall \
 		-I$(KERNEL_ROOT)/services/boards/$(BOARD) \
 		-I$(KERNEL_ROOT)/services/app
+
+
+# include $(KERNEL_ROOT)/compiler.mk