目前已成功通过ttyUSB2 访问4Ｇ模块PPP端口， 进行拔号上网，
现在想通过 通过ttyUSB1 访问4Ｇ模块，使用AT指令，
在控制台测试结果如下：
root@TinaLinux:/# cat /dev/ttyUSB1
[ 168.317142] ERR: sunxi_hcd_schedule, best_end
[ 168.322014] ERR: sunxi_hcd_schedule failed
[ 168.326744] ERR: sunxi_hcd_schedule, best_end
[ 168.331596] ERR: sunxi_hcd_schedule failed
[ 168.336205] ERR: sunxi_hcd_schedule, best_end
[ 168.341048] ERR: sunxi_hcd_schedule failed
[ 168.345642] ERR: sunxi_hcd_schedule, best_end
[ 168.350479] ERR: sunxi_hcd_schedule failed
芯片是F1C200S
请问高手们，这是什么原因？
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