Changed the MicroBlaze demo back to using heap_3.c having updated the linker script generation.

Demo/MicroBlaze_Spartan-6_EthernetLite/SDKProjects/RTOSDemoSource/CreateProjectDirectoryStructure.bat

@@ -68,7 +68,7 @@ IF EXIST FreeRTOS_Source Goto END
     copy %FREERTOS_SOURCE%\portable\MemMang\heap_3.c FreeRTOS_Source\portable\MemMang
 
     REM Copy the basic memory allocation files into the BSP directory
-    copy %FREERTOS_SOURCE%\portable\MemMang\heap_2.c %BSP_SOURCE%\portable\MemMang
+    copy %FREERTOS_SOURCE%\portable\MemMang\heap_3.c %BSP_SOURCE%\portable\MemMang
 
     REM Copy the files that define the common demo tasks.
     copy %COMMON_SOURCE%\dynamic.c         Demo_Source

Demo/MicroBlaze_Spartan-6_EthernetLite/SDKProjects/RTOSDemoSource/main-blinky.c

@@ -422,7 +422,14 @@ void vApplicationStackOverflowHook( xTaskHandle *pxTask, signed char *pcTaskName
 
 void vApplicationIdleHook( void )
 {
-volatile size_t xFreeHeapSpace;
+#ifdef EXAMPLE_CODE_ONLY
+
+	The following code can only be included if heap_1.c or heap_2.c is used in
+	the project.  By default, heap_3.c is used, so the example code is
+	excluded.  See http://www.freertos.org/a00111.html for more information on
+	memory management options.
+
+	volatile size_t xFreeHeapSpace;
 
 		/* vApplicationIdleHook() will only be called if configUSE_IDLE_HOOK is set
 		to 1 in FreeRTOSConfig.h.  It will be called on each iteration of the idle
@@ -445,6 +452,7 @@ volatile size_t xFreeHeapSpace;
 			the value of configTOTAL_HEAP_SIZE in FreeRTOSConfig.h can be
 			reduced accordingly. */
 		}
+#endif
 }
 /*-----------------------------------------------------------*/
 

Demo/MicroBlaze_Spartan-6_EthernetLite/SDKProjects/RTOSDemoSource/src/lscript.ld

@@ -11,7 +11,7 @@
 /*******************************************************************/
 
 _STACK_SIZE = DEFINED(_STACK_SIZE) ? _STACK_SIZE : 0x400;
-_HEAP_SIZE = DEFINED(_HEAP_SIZE) ? _HEAP_SIZE : 0x8;
+_HEAP_SIZE = DEFINED(_HEAP_SIZE) ? _HEAP_SIZE : 0x10400;
 
 /* Define Memories in the system */