diff --git a/libs/CMSIS/Device/ST/STM32F0xx/Source/Templates/gcc_ride7/startup_stm32f0xx.s b/libs/CMSIS/Device/ST/STM32F0xx/Source/Templates/gcc_ride7/startup_stm32f0xx.s
index 6427d4d..f257d06 100644
--- a/libs/CMSIS/Device/ST/STM32F0xx/Source/Templates/gcc_ride7/startup_stm32f0xx.s
+++ b/libs/CMSIS/Device/ST/STM32F0xx/Source/Templates/gcc_ride7/startup_stm32f0xx.s
@@ -89,7 +89,12 @@ LoopCopyDataInit:
 /* Zero fill the bss segment. */  
 FillZerobss:
   movs r3, #0
-  str r3, [r2], #4
+// XXX fix a bug.	
+  str r3, [r2]
+  adds r2, r2, #4
+// XXX original code:
+//  str r3, [r2], #4
+// XXX Done
     
 LoopFillZerobss:
   ldr r3, = _ebss
diff --git a/libs/STM32F0xx_StdPeriph_Driver/src/stm32f0xx_dac.c b/libs/STM32F0xx_StdPeriph_Driver/src/stm32f0xx_dac.c
index 752c7c0..fd96a0d 100644
--- a/libs/STM32F0xx_StdPeriph_Driver/src/stm32f0xx_dac.c
+++ b/libs/STM32F0xx_StdPeriph_Driver/src/stm32f0xx_dac.c
@@ -98,6 +98,7 @@
 
 /* Includes ------------------------------------------------------------------*/
 #include "stm32f0xx_dac.h"
+#include "stm32f0xx_rcc.h"
 
 /** @addtogroup STM32F0xx_StdPeriph_Driver
   * @{