Merge pull request #3065 from balanceTWK/master_HEAP_BEGIN

[bsp][stm32] fix : #define HEAP_BEGIN

bsp/stm32/stm32l475-atk-pandora/board/board.h

@@ -28,7 +28,17 @@ extern "C" {
 #define STM32_SRAM1_START              (0x20000000)
 #define STM32_SRAM1_END                (STM32_SRAM1_START + STM32_SRAM1_SIZE * 1024)
 
-#define HEAP_BEGIN                     STM32_SRAM1_START
+#if defined(__CC_ARM) || defined(__CLANG_ARM)
+extern int Image$$RW_IRAM1$$ZI$$Limit;
+#define HEAP_BEGIN      ((void *)&Image$$RW_IRAM1$$ZI$$Limit)
+#elif __ICCARM__
+#pragma section="CSTACK"
+#define HEAP_BEGIN      (__segment_end("CSTACK"))
+#else
+extern int __bss_end;
+#define HEAP_BEGIN      ((void *)&__bss_end)
+#endif
+
 #define HEAP_END                       STM32_SRAM1_END
 
 void SystemClock_Config(void);

bsp/stm32/stm32l475-atk-pandora/board/linker_scripts/link.icf

@@ -29,5 +29,4 @@ do not initialize  { section .noinit };
 place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };
 
 place in ROM_region   { readonly };
-place in RAM1_region  { section .sram };
-place in RAM2_region  { readwrite, last block CSTACK};
+place in RAM1_region  { section .sram , readwrite, last block CSTACK};

bsp/stm32/stm32l475-atk-pandora/board/linker_scripts/link.lds

@@ -89,7 +89,7 @@ SECTIONS
         . = ALIGN(4);
         /* This is used by the startup in order to initialize the .data secion */
         _edata = . ;
-    } >RAM2
+    } >RAM1
 
     .stack : 
     {
@@ -98,7 +98,7 @@ SECTIONS
         . = . + _system_stack_size;
         . = ALIGN(4);
         _estack = .;
-    } >RAM2
+    } >RAM1
 
     __bss_start = .;
     .bss :
@@ -116,7 +116,7 @@ SECTIONS
         _ebss = . ;
         
         *(.bss.init)
-    } > RAM2
+    } > RAM1
     __bss_end = .;
 
     _end = .;

bsp/stm32/stm32l475-atk-pandora/board/linker_scripts/link.sct

@@ -8,7 +8,7 @@ LR_IROM1 0x08000000 0x00080000  {    ; load region size_region
    *(InRoot$$Sections)
    .ANY (+RO)
   }
-  RW_IRAM2 0x10000000 0x00008000  {  ; RW data
+  RW_IRAM1 0x20000000 0x00018000  {  ; RW data
    .ANY (+RW +ZI)
   }
 }