I find that heap_3.c is used in the demo of AT91SAM9XE, but I can not successfully port FreeRTOS to AT91SAM9G20 with heap_3.c in IAR. However, I have ported FreeRTOS to AT91SAM9G20 successfully with heap_2.c. If I want to use heap_3.c, what setting should I modify in IAR? Or what codes should I modify? Thanks for instructions!