STM32F0xx: GCC_ARM remove zero bss, in startup.

zero bss is done in libc init after call to _start.

Author: jamike

targets/TARGET_STM/TARGET_STM32F0/TARGET_DISCO_F051R8/device/TOOLCHAIN_GCC_ARM/startup_stm32f051x8.S

@@ -55,10 +55,6 @@ 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
 
   .section .text.Reset_Handler
   .weak Reset_Handler
@@ -83,19 +79,6 @@ 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]
-  adds r2, r2, #4
-
-
-LoopFillZerobss:
-  ldr r3, = _ebss
-  cmp r2, r3
-  bcc FillZerobss
 
 /* Call the clock system intitialization function.*/
   bl  SystemInit

targets/TARGET_STM/TARGET_STM32F0/TARGET_NUCLEO_F030R8/device/TOOLCHAIN_GCC_ARM/startup_stm32f030x8.S

@@ -55,10 +55,6 @@ 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
 
   .section .text.Reset_Handler
   .weak Reset_Handler
@@ -83,19 +79,6 @@ 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]
-  adds r2, r2, #4
-
-
-LoopFillZerobss:
-  ldr r3, = _ebss
-  cmp r2, r3
-  bcc FillZerobss
 
 /* Call the clock system intitialization function.*/
   bl  SystemInit

targets/TARGET_STM/TARGET_STM32F0/TARGET_NUCLEO_F031K6/device/TOOLCHAIN_GCC_ARM/startup_stm32f031x6.s

@@ -55,10 +55,6 @@ 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
 
   .section .text.Reset_Handler
   .weak Reset_Handler
@@ -83,19 +79,6 @@ 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]
-  adds r2, r2, #4
-
-
-LoopFillZerobss:
-  ldr r3, = _ebss
-  cmp r2, r3
-  bcc FillZerobss
 
 /* Call the clock system intitialization function.*/
   bl  SystemInit

targets/TARGET_STM/TARGET_STM32F0/TARGET_NUCLEO_F042K6/device/TOOLCHAIN_GCC_ARM/startup_stm32f042x6.s

@@ -55,10 +55,6 @@ 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
 
 /**
  * @brief  This is the code that gets called when the processor first
@@ -115,19 +111,6 @@ 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]
-  adds r2, r2, #4
-
-
-LoopFillZerobss:
-  ldr r3, = _ebss
-  cmp r2, r3
-  bcc FillZerobss
 
 /* Call the clock system intitialization function.*/
   bl  SystemInit

targets/TARGET_STM/TARGET_STM32F0/TARGET_NUCLEO_F070RB/device/TOOLCHAIN_GCC_ARM/startup_stm32f070xb.S

@@ -55,10 +55,7 @@ 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
+
 
   .section .text.Reset_Handler
   .weak Reset_Handler
@@ -83,19 +80,6 @@ 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]
-  adds r2, r2, #4
-
-
-LoopFillZerobss:
-  ldr r3, = _ebss
-  cmp r2, r3
-  bcc FillZerobss
 
 /* Call the clock system intitialization function.*/
   bl  SystemInit

targets/TARGET_STM/TARGET_STM32F0/TARGET_NUCLEO_F072RB/device/TOOLCHAIN_GCC_ARM/startup_stm32f072xb.S

@@ -55,10 +55,6 @@ 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
 
   .section .text.Reset_Handler
   .weak Reset_Handler
@@ -83,19 +79,6 @@ 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]
-  adds r2, r2, #4
-
-
-LoopFillZerobss:
-  ldr r3, = _ebss
-  cmp r2, r3
-  bcc FillZerobss
 
 /* Call the clock system intitialization function.*/
     bl  SystemInit

targets/TARGET_STM/TARGET_STM32F0/TARGET_NUCLEO_F091RC/device/TOOLCHAIN_GCC_ARM/startup_stm32f091xc.S

@@ -55,10 +55,6 @@ 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
 
   .section .text.Reset_Handler
   .weak Reset_Handler
@@ -83,19 +79,6 @@ 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]
-  adds r2, r2, #4
-
-
-LoopFillZerobss:
-  ldr r3, = _ebss
-  cmp r2, r3
-  bcc FillZerobss
 
 /* Call the clock system intitialization function.*/
     bl  SystemInit