I have made a circuit board based on MK64FN1M0VLQ12 microchip, recently。I found some problems when i try to develop software base on "frdmk64f" platform of ksdk1.3.0. It can work well when programming the "lwip_ping_demo" program of “lwip” base on “MQX” or " UCOS II" system. I can ping to the board through an ethernet cable. Howerever, I can not ping to the board if I programming the "lwip_ping_demo" program based on "FreeRtos" system. There is another question when I restart the board for all the demo program, The program on board can not running unless I press the resert pin each time I restart the board power. Since the version of ksdk after 2.0 is all based on "FreeRtos",I downloaded and reserched the new ksdk version of 2.0 and 2.4. The same phenomenon happened to my test, I still can not ping to my board when rogramming the "lwip_ping_demo" program of “lwip” base on “FreeRtos” system. Well, the new version demo also bring me a good news: The program on board can running normally each time I restart the board power. Is there any body experienced similar problems? Can anyone give me some suggestions for my job ?