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Syscalls update

--- a/demos/stm32f429_disco/syscalls.c

+++ b/demos/stm32f429_disco/syscalls.c

@@ -67,24 +67,22 @@

 caddr_t _sbrk(int incr)

 {

-    extern char __heap_end asm("__heap_end");

-    static char *heap_end;

-    char *prev_heap_end;

+	extern char __heap_start;

+	extern char __heap_end;

+	static char *current_heap_end = &__heap_start;

+	char *previous_heap_end;

-    if (heap_end == 0)

-        heap_end = &__heap_end;

+	previous_heap_end = current_heap_end;

-    prev_heap_end = heap_end;

-    if ((unsigned int)(heap_end + incr) > (0x20000000 + 0x20000))

-    {

-        abort();

-        errno = ENOMEM;

-        return (caddr_t) -1;

-    }

+	if (current_heap_end + incr > &__heap_end)

+	{

+		errno = ENOMEM;

+		return (caddr_t) -1;

+	}

-    heap_end += incr;

+	current_heap_end += incr;

-    return (caddr_t) prev_heap_end;

+	return (caddr_t)previous_heap_end;

 }

 int _close(int file)