usb驱动一个小问题 麻烦看看
musb-hdrc: version 6.0, host, debug=0
musb-hdrc musb-hdrc.0: dma type: dma-cppi41
MUSB controller-0 revision 4ea20800
musb-hdrc musb-hdrc.0: MUSB HDRC host driver
musb-hdrc musb-hdrc.0: new USB bus registered, assigned bus number 1
usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: MUSB HDRC host driver
usb usb1: Manufacturer: Linux 2.6.37 musb-hcd
usb usb1: SerialNumber: musb-hdrc.0
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
musb-hdrc musb-hdrc.0: USB Host mode controller at c881e000 using DMA, IRQ 18
musb-hdrc musb-hdrc.1: dma type: dma-cppi41
MUSB controller-1 revision 4ea20800
musb-hdrc musb-hdrc.1: MUSB HDRC host driver
musb-hdrc musb-hdrc.1: new USB bus registered, assigned bus number 2
usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb2: Product: MUSB HDRC host driver
usb usb2: Manufacturer: Linux 2.6.37 musb-hcd
usb usb2: SerialNumber: musb-hdrc.1
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 1 port detected
musb-hdrc musb-hdrc.1: USB Host mode controller at c8828800 using DMA, IRQ 19
usb 2-1: new full speed USB device using musb-hdrc and address 2
usb 2-1: New USB device found, idVendor=1c9e, idProduct=9e00
usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 2-1: Product: USB Modem
usb 2-1: Manufacturer: USB Modem
usb 2-0 idVendor=1d6b 在 查看usb设备信息的时候 能够看到，但是usb 2-1 idVendor=1c9e 并没有查看到！ 对比上面的打印信息 是少了这两行：
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 1 port detected
但是这个为什么？ 有点不解
usb驱动 usb
Linux
[解决办法]
USB hub 的驱动不是系统自带的 不用自己编写吗？
