STM32Cube_FW_WB_V1.4.0 - STM32WB55xx part

Author: jeromecoutant

targets/TARGET_STM/TARGET_STM32WB/TARGET_STM32WB55xx/TOOLCHAIN_GCC_ARM/startup_stm32wb55xx.S

@@ -44,21 +44,29 @@ 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
-  .type Reset_Handler, %function
-Reset_Handler:
-  ldr   r0, =_estack
-  mov   sp, r0          /* set stack pointer */
-
-/* Copy the data segment initializers from flash to SRAM */
-  ldr r0, =_sdata
-  ldr r1, =_edata
-  ldr r2, =_sidata
+/* start address for the .MB_MEM2 section. defined in linker script */
+.word _sMB_MEM2
+/* end address for the .MB_MEM2 section. defined in linker script */
+.word _eMB_MEM2
+
+/* INIT_BSS macro is used to fill the specified region [start : end] with zeros */
+.macro INIT_BSS start, end
+  ldr r0, =\start
+  ldr r1, =\end
   movs r3, #0
-  b	LoopCopyDataInit
+  bl LoopFillZerobss
+.endm
+
+/* INIT_DATA macro is used to copy data in the region [start : end] starting from 'src' */
+.macro INIT_DATA start, end, src
+  ldr r0, =\start
+  ldr r1, =\end
+  ldr r2, =\src
+  movs r3, #0
+  bl LoopCopyDataInit
+.endm
 
+.section  .text.data_initializers
 CopyDataInit:
   ldr r4, [r2, r3]
   str r4, [r0, r3]
@@ -67,21 +75,31 @@ CopyDataInit:
 LoopCopyDataInit:
   adds r4, r0, r3
   cmp r4, r1
-  bcc CopyDataInit
-  
-/* Zero fill the bss segment. */
-  ldr r2, =_sbss
-  ldr r4, =_ebss
-  movs r3, #0
-  b LoopFillZerobss
+  bcc  CopyDataInit
+  bx lr
 
 FillZerobss:
-  str  r3, [r2]
-  adds r2, r2, #4
+  str  r3, [r0]
+  adds r0, r0, #4
 
 LoopFillZerobss:
-  cmp r2, r4
+  cmp r0, r1
   bcc FillZerobss
+  bx lr
+
+  .section .text.Reset_Handler
+  .weak Reset_Handler
+  .type Reset_Handler, %function
+Reset_Handler:
+  ldr   r0, =_estack
+  mov   sp, r0          /* set stack pointer */
+
+/* Copy the data segment initializers from flash to SRAM */
+  INIT_DATA _sdata, _edata, _sidata
+
+/* Zero fill the bss segments. */
+  INIT_BSS _sbss, _ebss
+  INIT_BSS _sMB_MEM2, _eMB_MEM2
 
 /* Call the clock system intitialization function.*/
   bl  SystemInit

targets/TARGET_STM/TARGET_STM32WB/TARGET_STM32WB55xx/TOOLCHAIN_GCC_ARM/stm32wb55xx.ld

@@ -206,7 +206,9 @@ SECTIONS
 
     .ble_shared_no_ret (NOLOAD) :
     {
+      _sMB_MEM2 = . ;
       *(MB_MEM2);
+      _eMB_MEM2 = . ;
     } >RAM2b
 
     /* Set stack top to end of RAM, and stack limit move down by