我是一个新手,正在学习如何为USB设备编写Linux设备驱动程序。我想了解dmesg输出
[ 6870.420077] usb 2-5: new low-speed USB device number 43 using ohci_hcd
[ 6870.500057] hub 2-0:1.0: unable to enumerate USB device on port 5
[ 6871.444057] usb 2-5: new low-speed USB device number 44 using ohci_hcd
[ 6871.524065] hub 2-0:1.0: unable to