大伙都来帮帮忙！谢谢

lanqiucoco

mips设备，linux内核是2.6.21，在/proc/devices文件中有显示usb的设备号，但是，即是挂载usb文件系统(mount -t usbfs usbfs /proc/bus/usb)，/proc/bus/usb/目录下也没有devices文件。
将上网卡插入、拔出3g usb网卡，设备也没有任何提示和反应。

编译内核的时候，对usb选项做出以下选择，
<*> Support for Host-side USB
[*]   USB device filesystem       
---  USB Host Controller Drivers  
<*>   ISP116X HCD support
< >   SL811HS HCD support
（不知为何，对应的开发板的源码选项没有EHCI、UHCI/OHCI，通过"/"搜索，"EHCI" = no、"OHCI" = no，这两个选项是usb必须的？）


<*>   USB Modem (CDC ACM) support
<*> USB Mass Storage support
[*] USB Monitor
    USB Serial Converter support  --->
            <*> USB Serial Converter support
                [*]   USB Generic Serial Driver
                <*>   USB driver for GSM and CDMA modems

开机信息中关于usb的信息如下
#dmesg | grep usb
driver_register usbfs
bus usb: add driver usbfs
usbcore: registered new interface driver usbfs
bus usb: add driver hub
usbcore: registered new interface driver hub
driver_register usb
bus usb: add driver usb
usbcore: registered new device driver usb
usbmon: debugfs is not available
bus usb: add driver cdc_acm
usbcore: registered new interface driver cdc_acm
drivers/usb/class/cdc-acm.c: v0.25:USB Abstract Control Model driver for USB modems and ISDN adapters
driver_register usb-storage
bus usb: add driver usb-storage
usbcore: registered new interface driver usb-storage
driver_register usbserial
bus usb: add driver usbserial
usbcore: registered new interface driver usbserial
bus usb-serial: add driver generic
drivers/usb/serial/usb-serial.c: USB Serial support registered for generic
driver_register usbserial_generic
bus usb: add driver usbserial_generic
usbcore: registered new interface driver usbserial_generic
drivers/usb/serial/usb-serial.c: USB Serial Driver core
bus usb-serial: add driver option1
drivers/usb/serial/usb-serial.c: USB Serial support registered for GSM modem (1-port)
bus usb: add driver option
usbcore: registered new interface driver option
drivers/usb/serial/option.c: USB Driver for GSM modems: v0.7.1

是不是我内核选项选少了？选少了那些？谢谢！