diff --git a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/TOOLCHAIN_ARM_MICRO/stm32f401xe.sct b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/TOOLCHAIN_ARM_MICRO/stm32f401xe.sct
index 6ebea0c937..9db2d65eb7 100644
--- a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/TOOLCHAIN_ARM_MICRO/stm32f401xe.sct
+++ b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/TOOLCHAIN_ARM_MICRO/stm32f401xe.sct
@@ -27,7 +27,8 @@
 ; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
-LR_IROM1 0x08000000 0x80000  {    ; load region size_region (512K)
+; STM32F401RE: 512KB FLASH + 96KB SRAM
+LR_IROM1 0x08000000 0x80000  {    ; load region size_region
 
   ER_IROM1 0x08000000 0x80000  {  ; load address = execution address
    *.o (RESET, +First)
diff --git a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/TOOLCHAIN_ARM_STD/stm32f401xe.sct b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/TOOLCHAIN_ARM_STD/stm32f401xe.sct
index 6ebea0c937..9db2d65eb7 100644
--- a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/TOOLCHAIN_ARM_STD/stm32f401xe.sct
+++ b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/TOOLCHAIN_ARM_STD/stm32f401xe.sct
@@ -27,7 +27,8 @@
 ; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
-LR_IROM1 0x08000000 0x80000  {    ; load region size_region (512K)
+; STM32F401RE: 512KB FLASH + 96KB SRAM
+LR_IROM1 0x08000000 0x80000  {    ; load region size_region
 
   ER_IROM1 0x08000000 0x80000  {  ; load address = execution address
    *.o (RESET, +First)
diff --git a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/stm32f4xx.h b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/stm32f4xx.h
index a9c53278d6..6cac463c79 100644
--- a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/stm32f4xx.h
+++ b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/stm32f4xx.h
@@ -196,6 +196,10 @@ typedef enum
   * @}
   */
 
+#if defined (USE_HAL_DRIVER)
+ #include "stm32f4xx_hal.h"
+#endif /* USE_HAL_DRIVER */
+
 
 #ifdef __cplusplus
 }
diff --git a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/stm32f4xx_hal_conf.h b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/stm32f4xx_hal_conf.h
index 5878af328b..111c19651f 100644
--- a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/stm32f4xx_hal_conf.h
+++ b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/stm32f4xx_hal_conf.h
@@ -103,7 +103,7 @@
 #endif /* HSE_VALUE */
 
 #if !defined  (HSE_STARTUP_TIMEOUT)
-  #define HSE_STARTUP_TIMEOUT    ((uint32_t)5000)   /*!< Time out for HSE start up, in ms */
+  #define HSE_STARTUP_TIMEOUT    ((uint32_t)50)   /*!< Time out for HSE start up, in ms */
 #endif /* HSE_STARTUP_TIMEOUT */
 
 /**
@@ -115,6 +115,14 @@
   #define HSI_VALUE    ((uint32_t)16000000) /*!< Value of the Internal oscillator in Hz*/
 #endif /* HSI_VALUE */
 
+/**
+  * @brief External Low Speed oscillator (LSE) value.
+  *        This value is used by the UART, RTC HAL module to compute the system frequency
+  */
+#if !defined  (LSE_VALUE)
+  #define LSE_VALUE    ((uint32_t)32768) /*!< Value of the External oscillator in Hz*/
+#endif /* LSE_VALUE */
+
 /**
   * @brief External clock source for I2S peripheral
   *        This value is used by the I2S HAL module to compute the I2S clock source 
@@ -131,7 +139,8 @@
 /**
   * @brief This is the HAL system configuration section
   */     
-#define  VDD_VALUE                    ((uint32_t)3300) /*!< Value of VDD in mv */           
+#define  VDD_VALUE                    ((uint32_t)3300) /*!< Value of VDD in mv */
+#define  TICK_INT_PRIORITY            ((uint32_t)3)    /*!< tick interrupt priority */            
 #define  USE_RTOS                     0     
 #define  PREFETCH_ENABLE              1              
 #define  INSTRUCTION_CACHE_ENABLE     1
diff --git a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/stm32f4xx_hal_rcc.h b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/stm32f4xx_hal_rcc.h
index 02b254d5dc..d86b5c7a15 100644
--- a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/stm32f4xx_hal_rcc.h
+++ b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/stm32f4xx_hal_rcc.h
@@ -190,7 +190,7 @@ typedef struct
 
 
 #define DBP_TIMEOUT_VALUE          ((uint32_t)100)
-#define LSE_TIMEOUT_VALUE          ((uint32_t)5000)
+#define LSE_TIMEOUT_VALUE          ((uint32_t)100)
 /**
   * @}
   */
diff --git a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/system_stm32f4xx.h b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/system_stm32f4xx.h
index 2df387f856..cbbd1b16a4 100644
--- a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/system_stm32f4xx.h
+++ b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/system_stm32f4xx.h
@@ -32,8 +32,8 @@
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
-  ******************************************************************************  
-  */ 
+  ******************************************************************************
+  */
 
 /** @addtogroup CMSIS
   * @{