immedately change clock rate to load data sections faster

targets/stm32l432/src/startup_stm32l432xx.s

@@ -79,6 +79,8 @@ Reset_Handler:
   ldr   sp, =_estack    /* Atollic update: set stack pointer */
 
 /* Copy the data segment initializers from flash to SRAM */
+/* Call the clock system intitialization function.*/
+    bl  SystemInit
   movs	r1, #0
   b	LoopCopyDataInit
 
@@ -106,8 +108,7 @@ LoopFillZerobss:
 	cmp	r2, r3
 	bcc	FillZerobss
 
-/* Call the clock system intitialization function.*/
-    bl  SystemInit
+
 /* Call static constructors */
     bl __libc_init_array
 /* Call the application's entry point.*/

targets/stm32l432/src/system_stm32l4xx.c

@@ -106,6 +106,7 @@
   */
 
 #include "stm32l4xx.h"
+#include "init.h"
 
 #if !defined  (HSE_VALUE)
   #define HSE_VALUE    8000000U  /*!< Value of the External oscillator in Hz */
@@ -219,6 +220,8 @@ void SystemInit(void)
   /* Disable all interrupts */
   RCC->CIER = 0x00000000U;
 
+  SystemClock_Config_LF();
+
 }
 
 /**