Hi @qiang
Please download freertos zip file from https://www.freertos.org/
Then unzip freertosv10.2.1, you can get the Kinetis_k60_tower_IAR demo.
please refer to below picture
Then you can port it to K64. Please refer to below doc for detailed steps.
https://blog.csdn.net/wgp2hpp/article/details/101360168
Regards
Daniel