[bsp] replace magic number as link script symbol

bsp/imxrt1052-evk/Libraries/arm/MIMXRT1052xxxxx_flexspi_nor.scf

@@ -67,6 +67,9 @@
   #define Heap_Size                    0x0400
 #endif
 
+#define RTT_HEAP_SIZE                   \
+    (m_data_size - ImageLength(RW_m_data) - ImageLength(ARM_LIB_HEAP) - ImageLength(ARM_LIB_STACK))
+
 LR_m_text m_text_start m_text_size {   ; load region size_region
   ER_m_text m_text_start m_text_size { ; load address = execution address
     * (RESET,+FIRST)
@@ -81,6 +84,8 @@ LR_m_text m_text_start m_text_size {   ; load region size_region
   }
   ARM_LIB_STACK +0 EMPTY Stack_Size { ; Stack region growing down
   }
+  RTT_HEAP +0 EMPTY RTT_HEAP_SIZE {
+  }
 
   RW_m_ncache m_ncache_start m_ncache_size { ; ncache RW data
     * (NonCacheable.init)

bsp/imxrt1052-evk/Libraries/gcc/MIMXRT1052xxxxx_flexspi_nor.ld

@@ -253,12 +253,16 @@ SECTIONS
     stack_start = .;
     . += STACK_SIZE;
     stack_end = .;
+    __StackTop = .;
+  } > m_dtcm
+  
+  .RTT_HEAP :
+  {
     heap_start = .;
+    . = ALIGN(8);
   } > m_dtcm
 
-  /* Initializes stack on the end of block */
-  __StackTop   = stack_end;
-  PROVIDE(__stack = __StackTop);
+  PROVIDE(heap_end = ORIGIN(m_dtcm) + LENGTH(m_dtcm));
 
   .ARM.attributes 0 : { *(.ARM.attributes) }
 

bsp/imxrt1052-evk/Libraries/iar/MIMXRT1052xxxxx_flexspi_nor.icf

@@ -81,6 +81,7 @@ if (isdefinedsymbol(__heap_size__)) {
 define exported symbol __VECTOR_TABLE  = m_interrupts_start;
 define exported symbol __VECTOR_RAM    = m_interrupts_start;
 define exported symbol __RAM_VECTOR_TABLE_SIZE = 0x0;
+define exported symbol __RTT_HEAP_END = m_dtcm_end;
 
 define memory mem with size = 4G;
 define region TEXT_region = mem:[from m_interrupts_start to m_interrupts_end]

bsp/imxrt1052-evk/drivers/board.h

@@ -21,19 +21,22 @@
 #include <fsl_iomuxc.h>
 
 #ifdef __CC_ARM
-extern int Image$$ARM_LIB_STACK$$ZI$$Limit;
-#define HEAP_BEGIN          (&Image$$ARM_LIB_STACK$$ZI$$Limit)
-#define HEAP_END            (0x2001FFFFu)
+extern int Image$$RTT_HEAP$$ZI$$Base;
+extern int Image$$RTT_HEAP$$ZI$$Limit;
+#define HEAP_BEGIN          (&Image$$RTT_HEAP$$ZI$$Base)
+#define HEAP_END            (&Image$$RTT_HEAP$$ZI$$Limit)
 
 #elif __ICCARM__
 #pragma section="HEAP"
 #define HEAP_BEGIN          (__segment_end("HEAP"))
-#define HEAP_END            (0x2001FFFFu)
+extern void __RTT_HEAP_END;
+#define HEAP_END            (&__RTT_HEAP_END)
 
 #else
 extern int heap_start;
+extern int heap_end;
 #define HEAP_BEGIN          (&heap_start)
-#define HEAP_END            (0x2001FFFFu)
+#define HEAP_END            (&heap_end)
 #endif
 
 #define HEAP_SIZE           ((uint32_t)HEAP_END - (uint32_t)HEAP_BEGIN)