diff --git a/Ubiquitous/XiZi_IIoT/Makefile b/Ubiquitous/XiZi_IIoT/Makefile
index c41b4eda9..fda533036 100755
--- a/Ubiquitous/XiZi_IIoT/Makefile
+++ b/Ubiquitous/XiZi_IIoT/Makefile
@@ -5,7 +5,7 @@ MAKEFLAGS += --no-print-directory
 .PHONY:COMPILE_APP COMPILE_KERNEL
 
 
-riscv_support := kd233 maix-go hifive1-rev-B gapuino gd32vf103-rvstar rv32m1-vega aiit-riscv64-board xidatong-riscv64 edu-riscv64
+riscv_support := kd233 maix-go hifive1-rev-B gapuino gd32vf103-rvstar rv32m1-vega aiit-riscv64-board xidatong-riscv64 edu-riscv64 ch32v307vct6
 arm_support += stm32f407-st-discovery stm32f407zgt6 stm32f103-nano nuvoton-m2354 ok1052-c imxrt1176-sbc aiit-arm32-board xidatong-arm32 xiwangtong-arm32 edu-arm32
 emulator_support += hifive1-emulator k210-emulator cortex-m0-emulator cortex-m3-emulator cortex-m4-emulator
 support := $(riscv_support) $(arm_support) $(emulator_support) 
diff --git a/Ubiquitous/XiZi_IIoT/board/edu-arm32/config.mk b/Ubiquitous/XiZi_IIoT/board/edu-arm32/config.mk
index 222e6736c..bb44261da 100644
--- a/Ubiquitous/XiZi_IIoT/board/edu-arm32/config.mk
+++ b/Ubiquitous/XiZi_IIoT/board/edu-arm32/config.mk
@@ -1,6 +1,6 @@
 export CROSS_COMPILE ?=/usr/bin/arm-none-eabi-
 
-export CFLAGS := -mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=softfp -ffunction-sections -fdata-sections -Dgcc -O0 -fgnu89-inline -Wa,-mimplicit-it=thumb -Werror -Wformat -Wuninitialized
+export CFLAGS := -mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=softfp -ffunction-sections -fdata-sections -Dgcc -O0 -fgnu89-inline -Wa,-mimplicit-it=thumb -Werror -Wuninitialized
 # export CFLAGS := -mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=softfp -ffunction-sections -fdata-sections -Dgcc -O0 -gdwarf-2 -g -fgnu89-inline -Wa,-mimplicit-it=thumb -Werror
 export AFLAGS := -c -mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=softfp -ffunction-sections -fdata-sections -x assembler-with-cpp -Wa,-mimplicit-it=thumb  -gdwarf-2
 export LFLAGS := -mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=softfp -ffunction-sections -fdata-sections -Wl,--gc-sections,-Map=XiZi-edu-arm32.map,-cref,-u,Reset_Handler -T $(BSP_ROOT)/link.lds
diff --git a/Ubiquitous/XiZi_IIoT/resources/serial/dev_serial.c b/Ubiquitous/XiZi_IIoT/resources/serial/dev_serial.c
index 156db4ebb..d490c017d 100644
--- a/Ubiquitous/XiZi_IIoT/resources/serial/dev_serial.c
+++ b/Ubiquitous/XiZi_IIoT/resources/serial/dev_serial.c
@@ -286,6 +286,7 @@ static inline int SerialDevDMARead(struct SerialHardwareDevice *serial_dev, stru
     x_size_t read_dma_length;
     x_size_t read_dma_size = SerialGetRxFifoLength(serial_dev);
     
+    lock = CriticalAreaLock();
     if (serial_cfg->data_cfg.serial_buffer_size) {
         if(read_length < (int)read_dma_size)
             read_dma_length = read_length;