添加U盘支持   

     FL2440添加u盘的挂载比较简单，大部分的内容都是在内核里面做make menuconfig，配置内核。

 Device Drivers  ---> 

     Generic Driver Options  --->

                  (/sbin/hotplug) path to uevent helper                  //配置u盘的热插拔

      [*] Block devices  --->

                   <*>   Low Performance USB Block driver

     SCSI device support  ---> 

                  <*> SCSI device support 

                  <*> SCSI generic support

                  [*] Probe all LUNs on each SCSI device 

     [*] USB support  ---> 

                 <*>   Support for Host-side USB

                 [*]     USB device filesystem (DEPRECATED)

                 [*]     USB device class-devices (DEPRECATED)

                 <*>   USB Monitor

                 <*>   OHCI HCD support

                 <*>   USB Mass Storage support

File systems  --->                                              //配置u盘的文件系统

       DOS/FAT/NT Filesystems  --->

                  <*> MSDOS fs support

                  <*> VFAT (Windows-95) fs support

                   (936) Default codepage for FAT