OP-423 Port to OP: Claim (at run-time) the remaining un-used bytes (between heap and end of RAM) that are for data growth (needed at compile time).

CAREFULL: the heap section need to be the last section in RAM to avoid overwritting data...

also move address into linker (CC and OP)

flight/PiOS/STM32F10x/link_STM32103CB_CC_Rev1_sections.ld

@@ -11,6 +11,8 @@ PROVIDE (   xPortSysTickHandler = 0 ) ;
 PROVIDE(pios_board_info_blob = ORIGIN(BD_INFO));
 
 _estack = 0x20004FF0;
+/* there is probably a way to get that from the MEMORY section */
+_eram = 0x20005000;
 
 /* Section Definitions */
 SECTIONS

flight/PiOS/STM32F10x/link_STM3210E_OP_sections.ld

@@ -2,6 +2,8 @@
 _irq_stack_size = 0x400;
 /* This is the size of the stack for early init: life span is until scheduler starts */
 _init_stack_size = 0x400;
+/* there is probably a way to get that from the MEMORY section */
+_eram = 0x20010000;
 
 /* Check valid alignment for VTOR */
 ASSERT(ORIGIN(FLASH) == ALIGN(ORIGIN(FLASH), 0x80), "Start of memory region flash not aligned for startup vector table");
@@ -279,6 +281,10 @@ SECTIONS
         _init_stack_top = . - 4 ;
     } > RAM
     
+    /* keep the heap section at the end of the SRAM */
+    /* this will allow to claim the remaining bytes not used
+    /* at run time! (done by the reset vector).
+
     PROVIDE ( end = _ebss );
     PROVIDE ( _end = _ebss );
 

flight/PiOS/STM32F10x/startup_stm32f10x_HD_OP.S

@@ -128,7 +128,13 @@ LoopFillZerobss:
   add r0, #0
   msr control, r0
 /* add heap_post_rtos to the heap (if the capability/function exist) */
+/* Also claim the unused memory (between end of heap to end of memory */
+/* CAREFULL: the heap section must be the last section in RAM in order this to work */
   ldr r0, = _init_stack_size
+  ldr r1, = _eheap_post_rtos
+  ldr r2, = _eram
+  subs r2, r2, r1
+  adds r0, r0, r2
   bl xPortIncreaseHeapSize
 /* Start the FreeRTOS scheduler which never returns.*/
   bl vTaskStartScheduler

flight/PiOS/STM32F10x/startup_stm32f10x_MD_CC.S

@@ -49,7 +49,7 @@ defined in linker script */
 .word  _ebss
 
 .equ  BootRAM, 0xF108F85F
-.equ  _eram, 0x20005000
+
 /**
  * @brief  This is the code that gets called when the processor first
  *          starts execution following a reset event. Only the absolutely