diff --git a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K22F/serial_api.c b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K22F/serial_api.c
index 93e67afe746..0a3e82a9982 100644
--- a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K22F/serial_api.c
+++ b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K22F/serial_api.c
@@ -47,10 +47,6 @@ void serial_init(serial_t *obj, PinName tx, PinName rx) {
     obj->index = pinmap_merge(uart_tx, uart_rx);
     MBED_ASSERT((int)obj->index != NC);
 
-    // Need to initialize the clocks here as ticker init gets called before mbed_sdk_init
-    if (SystemCoreClock == DEFAULT_SYSTEM_CLOCK)
-        BOARD_BootClockRUN();
-
     uart_config_t config;
 
     UART_GetDefaultConfig(&config);
diff --git a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K22F/us_ticker.c b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K22F/us_ticker.c
index fd248033ae1..f7fb7b7f3ea 100644
--- a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K22F/us_ticker.c
+++ b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K22F/us_ticker.c
@@ -26,9 +26,6 @@ void us_ticker_init(void) {
         return;
     }
     us_ticker_inited = 1;
-    // Need to initialize the clocks here as ticker init gets called before mbed_sdk_init
-    if (SystemCoreClock == DEFAULT_SYSTEM_CLOCK)
-        BOARD_BootClockRUN();
     //Common for ticker/timer
     uint32_t busClock;
     // Structure to initialize PIT
diff --git a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K66F/serial_api.c b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K66F/serial_api.c
index d2688246523..8796a8aaeb2 100644
--- a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K66F/serial_api.c
+++ b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K66F/serial_api.c
@@ -47,10 +47,6 @@ void serial_init(serial_t *obj, PinName tx, PinName rx) {
     obj->index = pinmap_merge(uart_tx, uart_rx);
     MBED_ASSERT((int)obj->index != NC);
 
-    // Need to initialize the clocks here as ticker init gets called before mbed_sdk_init
-    if (SystemCoreClock == DEFAULT_SYSTEM_CLOCK)
-        BOARD_BootClockRUN();
-
     uart_config_t config;
 
     UART_GetDefaultConfig(&config);
diff --git a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K66F/us_ticker.c b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K66F/us_ticker.c
index fd248033ae1..f7fb7b7f3ea 100644
--- a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K66F/us_ticker.c
+++ b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K66F/us_ticker.c
@@ -26,9 +26,6 @@ void us_ticker_init(void) {
         return;
     }
     us_ticker_inited = 1;
-    // Need to initialize the clocks here as ticker init gets called before mbed_sdk_init
-    if (SystemCoreClock == DEFAULT_SYSTEM_CLOCK)
-        BOARD_BootClockRUN();
     //Common for ticker/timer
     uint32_t busClock;
     // Structure to initialize PIT
diff --git a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL27Z/serial_api.c b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL27Z/serial_api.c
index f94f1c07df4..5f2c3bc9929 100644
--- a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL27Z/serial_api.c
+++ b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL27Z/serial_api.c
@@ -46,10 +46,6 @@ void serial_init(serial_t *obj, PinName tx, PinName rx) {
     obj->index = pinmap_merge(uart_tx, uart_rx);
     MBED_ASSERT((int)obj->index != NC);
 
-    // Need to initialize the clocks here as ticker init gets called before mbed_sdk_init
-    if (SystemCoreClock == DEFAULT_SYSTEM_CLOCK)
-        BOARD_BootClockRUN();
-
     /* Set the LPUART clock source */
     if (obj->index == LPUART_0) {
         CLOCK_SetLpuart0Clock(1U);
diff --git a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL27Z/us_ticker.c b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL27Z/us_ticker.c
index 9acf9fe7164..2a2138041c8 100644
--- a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL27Z/us_ticker.c
+++ b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL27Z/us_ticker.c
@@ -28,10 +28,6 @@ void us_ticker_init(void) {
     }
     us_ticker_inited = 1;
 
-    // Need to initialize the clocks here as ticker init gets called before mbed_sdk_init
-    if (SystemCoreClock == DEFAULT_SYSTEM_CLOCK)
-        BOARD_BootClockRUN();
-
     //Timer uses PIT
     //Common for ticker/timer
     uint32_t busClock;
diff --git a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL43Z/serial_api.c b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL43Z/serial_api.c
index f94f1c07df4..5f2c3bc9929 100644
--- a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL43Z/serial_api.c
+++ b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL43Z/serial_api.c
@@ -46,10 +46,6 @@ void serial_init(serial_t *obj, PinName tx, PinName rx) {
     obj->index = pinmap_merge(uart_tx, uart_rx);
     MBED_ASSERT((int)obj->index != NC);
 
-    // Need to initialize the clocks here as ticker init gets called before mbed_sdk_init
-    if (SystemCoreClock == DEFAULT_SYSTEM_CLOCK)
-        BOARD_BootClockRUN();
-
     /* Set the LPUART clock source */
     if (obj->index == LPUART_0) {
         CLOCK_SetLpuart0Clock(1U);
diff --git a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL43Z/us_ticker.c b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL43Z/us_ticker.c
index 9acf9fe7164..2a2138041c8 100644
--- a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL43Z/us_ticker.c
+++ b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL43Z/us_ticker.c
@@ -28,10 +28,6 @@ void us_ticker_init(void) {
     }
     us_ticker_inited = 1;
 
-    // Need to initialize the clocks here as ticker init gets called before mbed_sdk_init
-    if (SystemCoreClock == DEFAULT_SYSTEM_CLOCK)
-        BOARD_BootClockRUN();
-
     //Timer uses PIT
     //Common for ticker/timer
     uint32_t busClock;
diff --git a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL82Z/serial_api.c b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL82Z/serial_api.c
index bea40787f12..97a0e0c61c0 100644
--- a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL82Z/serial_api.c
+++ b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL82Z/serial_api.c
@@ -46,10 +46,6 @@ void serial_init(serial_t *obj, PinName tx, PinName rx) {
     obj->index = pinmap_merge(uart_tx, uart_rx);
     MBED_ASSERT((int)obj->index != NC);
 
-    // Need to initialize the clocks here as ticker init gets called before mbed_sdk_init
-    if (SystemCoreClock == DEFAULT_SYSTEM_CLOCK)
-        BOARD_BootClockRUN();
-
     /* Set the LPUART clock source */
     CLOCK_SetLpuartClock(2U);
 
diff --git a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL82Z/us_ticker.c b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL82Z/us_ticker.c
index 0603a867a20..6f389d4d241 100644
--- a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL82Z/us_ticker.c
+++ b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL82Z/us_ticker.c
@@ -26,9 +26,6 @@ void us_ticker_init(void) {
         return;
     }
     us_ticker_inited = 1;
-    // Need to initialize the clocks here as ticker init gets called before mbed_sdk_init
-    if (SystemCoreClock == DEFAULT_SYSTEM_CLOCK)
-        BOARD_BootClockRUN();
     //Common for ticker/timer
     uint32_t busClock;
     // Structure to initialize PIT
diff --git a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KW24D/serial_api.c b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KW24D/serial_api.c
index bac73bf1b5e..c01982568ce 100644
--- a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KW24D/serial_api.c
+++ b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KW24D/serial_api.c
@@ -47,10 +47,6 @@ void serial_init(serial_t *obj, PinName tx, PinName rx) {
     obj->index = pinmap_merge(uart_tx, uart_rx);
     MBED_ASSERT((int)obj->index != NC);
 
-    // Need to initialize the clocks here as ticker init gets called before mbed_sdk_init
-    if (SystemCoreClock == DEFAULT_SYSTEM_CLOCK)
-        BOARD_BootClockRUN();
-
     uart_config_t config;
 
     UART_GetDefaultConfig(&config);
@@ -99,7 +95,7 @@ void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_b
         if (parity == ParityOdd) {
             temp |= UART_C1_PT_MASK;
         } else if (parity == ParityEven) {
-            // PT=0 so nothing more to do  
+            // PT=0 so nothing more to do
         } else {
             // Hardware does not support forced parity
             MBED_ASSERT(0);
diff --git a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KW24D/us_ticker.c b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KW24D/us_ticker.c
index fd248033ae1..f7fb7b7f3ea 100644
--- a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KW24D/us_ticker.c
+++ b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KW24D/us_ticker.c
@@ -26,9 +26,6 @@ void us_ticker_init(void) {
         return;
     }
     us_ticker_inited = 1;
-    // Need to initialize the clocks here as ticker init gets called before mbed_sdk_init
-    if (SystemCoreClock == DEFAULT_SYSTEM_CLOCK)
-        BOARD_BootClockRUN();
     //Common for ticker/timer
     uint32_t busClock;
     // Structure to initialize PIT
diff --git a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_MCU_K64F/serial_api.c b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_MCU_K64F/serial_api.c
index 50e29d148b8..c9e53883a63 100644
--- a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_MCU_K64F/serial_api.c
+++ b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_MCU_K64F/serial_api.c
@@ -47,10 +47,6 @@ void serial_init(serial_t *obj, PinName tx, PinName rx) {
     obj->index = pinmap_merge(uart_tx, uart_rx);
     MBED_ASSERT((int)obj->index != NC);
 
-    // Need to initialize the clocks here as ticker init gets called before mbed_sdk_init
-    if (SystemCoreClock == DEFAULT_SYSTEM_CLOCK)
-        BOARD_BootClockRUN();
-
     uart_config_t config;
 
     UART_GetDefaultConfig(&config);
@@ -99,7 +95,7 @@ void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_b
         if (parity == ParityOdd) {
             temp |= UART_C1_PT_MASK;
         } else if (parity == ParityEven) {
-            // PT=0 so nothing more to do  
+            // PT=0 so nothing more to do
         } else {
             // Hardware does not support forced parity
             MBED_ASSERT(0);
diff --git a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_MCU_K64F/us_ticker.c b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_MCU_K64F/us_ticker.c
index fd248033ae1..f7fb7b7f3ea 100644
--- a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_MCU_K64F/us_ticker.c
+++ b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_MCU_K64F/us_ticker.c
@@ -26,9 +26,6 @@ void us_ticker_init(void) {
         return;
     }
     us_ticker_inited = 1;
-    // Need to initialize the clocks here as ticker init gets called before mbed_sdk_init
-    if (SystemCoreClock == DEFAULT_SYSTEM_CLOCK)
-        BOARD_BootClockRUN();
     //Common for ticker/timer
     uint32_t busClock;
     // Structure to initialize PIT