下载文件系统

下载文件系统时出现
Enter your selection: 6
USB host is connected. Waiting a download.

Now, Downloading [ADDRESS:30000000h,TOTAL:53632138]
RECEIVED FILE SIZE:35717128*** Warning - bad CRC or NAND, using default environment
请教高手这是什么情况？

使用默认环境配置，这个可以忽视。