STM32F1xx : GCC_ARM remove zero bss done at startup.

Zero bss is done after the call to _start.

Author: jamike

targets/TARGET_STM/TARGET_STM32F1/TARGET_BLUEPILL_F103C8/device/TOOLCHAIN_GCC_ARM/startup_stm32f103xb.S

@@ -58,10 +58,6 @@ defined in linker script */
 .word _sdata
 /* end address for the .data section. defined in linker script */
 .word _edata
-/* start address for the .bss section. defined in linker script */
-.word _sbss
-/* end address for the .bss section. defined in linker script */
-.word _ebss
 
 .equ  BootRAM, 0xF108F85F
 /**
@@ -96,17 +92,6 @@ LoopCopyDataInit:
   adds r2, r0, r1
   cmp r2, r3
   bcc CopyDataInit
-  ldr r2, =_sbss
-  b LoopFillZerobss
-/* Zero fill the bss segment. */
-FillZerobss:
-  movs r3, #0
-  str r3, [r2], #4
-
-LoopFillZerobss:
-  ldr r3, = _ebss
-  cmp r2, r3
-  bcc FillZerobss
 
 /* Call the clock system intitialization function.*/
     bl  SystemInit

targets/TARGET_STM/TARGET_STM32F1/TARGET_DISCO_F100RB/device/TOOLCHAIN_GCC_ARM/startup_stm32f100xb.S

@@ -58,10 +58,7 @@ defined in linker script */
 .word _sdata
 /* end address for the .data section. defined in linker script */
 .word _edata
-/* start address for the .bss section. defined in linker script */
-.word _sbss
-/* end address for the .bss section. defined in linker script */
-.word _ebss
+
 
 .equ  BootRAM, 0xF108F85F
 /**
@@ -94,17 +91,6 @@ LoopCopyDataInit:
   adds r2, r0, r1
   cmp r2, r3
   bcc CopyDataInit
-  ldr r2, =_sbss
-  b LoopFillZerobss
-/* Zero fill the bss segment. */
-FillZerobss:
-  movs r3, #0
-  str r3, [r2], #4
-
-LoopFillZerobss:
-  ldr r3, = _ebss
-  cmp r2, r3
-  bcc FillZerobss
 
 /* Call the clock system intitialization function.*/
     bl  SystemInit

targets/TARGET_STM/TARGET_STM32F1/TARGET_NUCLEO_F103RB/device/TOOLCHAIN_GCC_ARM/startup_stm32f103xb.S

@@ -58,10 +58,6 @@ defined in linker script */
 .word _sdata
 /* end address for the .data section. defined in linker script */
 .word _edata
-/* start address for the .bss section. defined in linker script */
-.word _sbss
-/* end address for the .bss section. defined in linker script */
-.word _ebss
 
 .equ  BootRAM, 0xF108F85F
 /**
@@ -96,17 +92,6 @@ LoopCopyDataInit:
   adds r2, r0, r1
   cmp r2, r3
   bcc CopyDataInit
-  ldr r2, =_sbss
-  b LoopFillZerobss
-/* Zero fill the bss segment. */
-FillZerobss:
-  movs r3, #0
-  str r3, [r2], #4
-
-LoopFillZerobss:
-  ldr r3, = _ebss
-  cmp r2, r3
-  bcc FillZerobss
 
 /* Call the clock system intitialization function.*/
     bl  SystemInit