WhyCan Forum(哇酷开发者社区)

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？