diff --git a/rtos/rtx/TARGET_CORTEX_M/RTX_CM_lib.h b/rtos/rtx/TARGET_CORTEX_M/RTX_CM_lib.h
index e3fed81bf4..f2b1ab4228 100755
--- a/rtos/rtx/TARGET_CORTEX_M/RTX_CM_lib.h
+++ b/rtos/rtx/TARGET_CORTEX_M/RTX_CM_lib.h
@@ -482,7 +482,7 @@ extern uint32_t __StackTop[];
 #elif defined(TARGET_NZ32_SC151)
 #define INITIAL_SP            (0x20008000UL)
 
-#elif (defined(TARGET_STM32F446RE) || defined(TARGET_STM32F446VE))
+#elif defined(TARGET_STM32F446RE) || defined(TARGET_STM32F446VE) || defined(TARGET_STM32F446ZE)
 #define INITIAL_SP            (0x20020000UL)
 
 #elif defined(TARGET_STM32F070RB) || defined(TARGET_STM32F030R8)
diff --git a/rtos/rtx/TARGET_CORTEX_M/RTX_Conf_CM.c b/rtos/rtx/TARGET_CORTEX_M/RTX_Conf_CM.c
index 3b939794dd..70d9022f1e 100755
--- a/rtos/rtx/TARGET_CORTEX_M/RTX_Conf_CM.c
+++ b/rtos/rtx/TARGET_CORTEX_M/RTX_Conf_CM.c
@@ -51,7 +51,7 @@
 #  if   defined(TARGET_LPC1768) || defined(TARGET_LPC2368)   || defined(TARGET_LPC4088) || defined(TARGET_LPC4088_DM) || defined(TARGET_LPC4330) || defined(TARGET_LPC4337) || defined(TARGET_LPC1347) || defined(TARGET_K64F) || defined(TARGET_STM32F401RE)\
    || defined(TARGET_STM32F410RB) || defined(TARGET_KL46Z) || defined(TARGET_KL43Z)  || defined(TARGET_STM32F407) || defined(TARGET_F407VG)  || defined(TARGET_STM32F303VC) || defined(TARGET_LPC1549) || defined(TARGET_LPC11U68) \
    || defined(TARGET_STM32F411RE) || defined(TARGET_STM32F405RG) || defined(TARGET_K22F) || defined(TARGET_STM32F429ZI) || defined(TARGET_STM32F401VC) || defined(TARGET_MAX32610) || defined(TARGET_MAX32600) || defined(TARGET_TEENSY3_1) \
-   || defined(TARGET_STM32L152RE) || defined(TARGET_STM32F446RE) || defined(TARGET_STM32F446VE) || defined(TARGET_STM32L432KC) || defined(TARGET_STM32L476VG) || defined(TARGET_STM32L476RG) || defined(TARGET_STM32F469NI) || defined(TARGET_STM32F746NG) || defined(TARGET_STM32F746ZG) || defined(TARGET_STM32L152RC) \
+   || defined(TARGET_STM32L152RE) || defined(TARGET_STM32F446RE) || defined(TARGET_STM32F446VE) || defined(TARGET_STM32F446ZE) || defined(TARGET_STM32L432KC) || defined(TARGET_STM32L476VG) || defined(TARGET_STM32L476RG) || defined(TARGET_STM32F469NI) || defined(TARGET_STM32F746NG) || defined(TARGET_STM32F746ZG) || defined(TARGET_STM32L152RC) \
    || defined(TARGET_EFM32GG_STK3700) || defined(TARGET_EFM32WG_STK3800) || defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32PG_STK3401) || defined(TARGET_STM32F767ZI)
 #    define OS_TASKCNT         14
 #  elif defined(TARGET_LPC11U24) || defined(TARGET_STM32F303RE) || defined(TARGET_STM32F303K8) || defined(TARGET_LPC11U35_401)  || defined(TARGET_LPC11U35_501) || defined(TARGET_LPCCAPPUCCINO) || defined(TARGET_LPC1114) \
@@ -86,7 +86,7 @@
 #  if   defined(TARGET_LPC1768) || defined(TARGET_LPC2368)   || defined(TARGET_LPC4088) || defined(TARGET_LPC4088_DM) || defined(TARGET_LPC4330) || defined(TARGET_LPC4337) || defined(TARGET_LPC1347)  || defined(TARGET_K64F) || defined(TARGET_STM32F401RE)\
    || defined(TARGET_STM32F410RB) || defined(TARGET_KL46Z) || defined(TARGET_KL43Z) || defined(TARGET_STM32F407) || defined(TARGET_F407VG)  || defined(TARGET_STM32F303VC) || defined(TARGET_LPC1549) || defined(TARGET_LPC11U68) \
    || defined(TARGET_STM32F411RE) || defined(TARGET_STM32F405RG) || defined(TARGET_K22F) || defined(TARGET_STM32F429ZI) || defined(TARGET_STM32F401VC) || defined(TARGET_MAX32610) || defined(TARGET_MAX32600) || defined(TARGET_TEENSY3_1) \
-   || defined(TARGET_STM32L152RE) || defined(TARGET_STM32F446RE) || defined(TARGET_STM32F446VE) || defined(TARGET_STM32L432KC) || defined(TARGET_STM32L476VG) || defined(TARGET_STM32L476RG) || defined(TARGET_STM32F469NI) || defined(TARGET_STM32F746NG) || defined(TARGET_STM32F746ZG) || defined(TARGET_STM32L152RC) \
+   || defined(TARGET_STM32L152RE) || defined(TARGET_STM32F446RE) || defined(TARGET_STM32F446VE) || defined(TARGET_STM32F446ZE) || defined(TARGET_STM32L432KC) || defined(TARGET_STM32L476VG) || defined(TARGET_STM32L476RG) || defined(TARGET_STM32F469NI) || defined(TARGET_STM32F746NG) || defined(TARGET_STM32F746ZG) || defined(TARGET_STM32L152RC) \
    ||defined(TARGET_EFM32GG_STK3700) || defined(TARGET_STM32F767ZI)
 #      define OS_MAINSTKSIZE    256
 #  elif defined(TARGET_LPC11U24) || defined(TARGET_LPC11U35_401)  || defined(TARGET_LPC11U35_501) || defined(TARGET_LPCCAPPUCCINO)  || defined(TARGET_LPC1114) \
@@ -234,7 +234,7 @@
 #elif defined(TARGET_STM32L152RE)
 #    define OS_CLOCK       24000000
 
-#elif (defined(TARGET_STM32F446RE) || defined(TARGET_STM32F446VE))
+#elif defined(TARGET_STM32F446RE) || defined(TARGET_STM32F446ZE) || defined(TARGET_STM32F446VE)
 #    define OS_CLOCK       180000000
 
 #elif defined(TARGET_STM32F030R8)