AM1808 Linux 无法识别U盘

补充： 这是调试信息，感觉各种驱动都已经加载了。

Console: colour dummy device 80x30
Calibrating delay loop... 148.88 BogoMIPS (lpj=744448)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
devtmpfs: initialized
DaVinci: 144 gpio irqs
NET: Registered protocol family 16
baseboard_pre_init: Entered
mityomapl138_setup_nand: using 8 bit data
baseboard_init [IndustrialIO]...
bio: create slab <bio-0> at 0
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
Switching to clocksource timer0_1
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 4096 (order: 3, 32768 bytes)
TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
TCP: Hash tables configured (established 4096 bind 4096)
TCP reno registered
UDP hash table entries: 256 (order: 0, 4096 bytes)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
NET: Registered protocol family 1
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
NTFS driver 2.1.30 [Flags: R/W DEBUG].
JFFS2 version 2.2. (NAND) 漏 2001-2006 Red Hat, Inc.
msgmni has been set to 179
io scheduler noop registered (default)
start plist test
end plist test
Serial: 8250/16550 driver, 3 ports, IRQ sharing disabled
serial8250.0: ttyS0 at MMIO 0x1c42000 (irq = 25) is a 16550A
serial8250.0: ttyS1 at MMIO 0x1d0c000 (irq = 53) is a 16550A
console [ttyS1] enabled
serial8250.0: ttyS2 at MMIO 0x1d0d000 (irq = 61) is a 16550A
brd: module loaded
usbcore: registered new interface driver ub
at24 1-0050: 256 byte 24c02 EEPROM, read-only, 0 bytes/write
MityOMAPL138: Read Factory Config Failed: -110
Uniform Multi-Platform E-IDE driver
ide-gd driver 1.18
st: Version 20101219, fixed bufsize 32768, s/g segs 256
ONFI flash detected
ONFI param page 0 valid
NAND device: Manufacturer ID: 0x2c, Chip ID: 0xda (Micron MT29F2G08ABAEAWP)
Bad block table found at page 131008, version 0x01
Bad block table found at page 130944, version 0x01
Creating 2 MTD partitions on "davinci_nand.1":
0x000000000000-0x000008000000 : "rootfs"
0x000008000000-0x000010000000 : "homefs"
davinci_nand davinci_nand.1: controller rev. 2.5
spi_davinci spi_davinci.1: DMA: supported
spi_davinci spi_davinci.1: DMA: RX channel: 18, TX channel: 19, event queue: 0
m25p80 spi1.0: m25p64-nonjedec (8192 Kbytes)
Creating 8 MTD partitions on "m25p80":
0x000000000000-0x000000010000 : "ubl"
0x000000010000-0x000000090000 : "u-boot"
0x000000090000-0x0000000a0000 : "u-boot-env"
0x0000000a0000-0x0000000b0000 : "periph-config"
Using LCD panel: 
baseboard_setup_lcd: unknown LCD type : 
RMII PHY configured
0x0000000b0000-0x000000100000 : "reserved"
0x000000100000-0x000000400000 : "kernel"
0x000000400000-0x000000600000 : "fpga"
0x000000600000-0x000000800000 : "spare"
spi_davinci spi_davinci.1: Controller at 0xfef0e000
CAN device driver interface
mcp251x spi1.1: MCP251x didn't enter in conf mode after reset
mcp251x spi1.1: Probe failed
mcp251x spi1.1: probe failed
davinci_mdio davinci_mdio.0: davinci mdio revision 1.5
davinci_mdio davinci_mdio.0: detected phy mask fffffffe
davinci_mdio.0: probed
davinci_mdio davinci_mdio.0: phy[0]: device 0:00, driver unknown
usbcore: registered new interface driver hwa-rc
ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
ohci ohci.0: DA8xx OHCI
ohci ohci.0: new USB bus registered, assigned bus number 1
Waiting for USB PHY clock good...
ohci ohci.0: irq 59, io mem 0x01e25000
usb usb1: New USB device found, idVendor=1d6b, idProduct=0001
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: DA8xx OHCI
usb usb1: Manufacturer: Linux 3.2.0 ohci_hcd
usb usb1: SerialNumber: ohci.0
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
usbcore: registered new interface driver uas
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
usbcore: registered new interface driver libusual
usbcore: registered new interface driver ums-alauda
usbcore: registered new interface driver ums-cypress
usbcore: registered new interface driver ums-datafab
usbcore: registered new interface driver ums_eneub6250
usbcore: registered new interface driver ums-freecom
usbcore: registered new interface driver ums-isd200
usbcore: registered new interface driver ums-jumpshot
usbcore: registered new interface driver ums-karma
usbcore: registered new interface driver ums-onetouch
usbcore: registered new interface driver ums-realtek
usbcore: registered new interface driver ums-sddr09
usbcore: registered new interface driver ums-sddr55
usbcore: registered new interface driver ums-usbat
usbcore: registered new interface driver usbserial
usbserial: USB Serial Driver core
idmouse: 0.6:Siemens ID Mouse FingerTIP Sensor Driver
usbcore: registered new interface driver idmouse
mousedev: PS/2 mouse device common for all mice
omap_rtc omap_rtc: rtc core: registered omap_rtc as rtc0
omap_rtc: RTC power up reset detected
omap_rtc: already running
i2c /dev entries driver
cpuidle: using governor ladder
cpuidle: using governor menu
davinci_mmc davinci_mmc.0: Using DMA, 4-bit mode
usbcore: registered new interface driver ushc
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
usbip_core: USB/IP Core v1.0.0
usbcore: registered new interface driver usbip-host
usbip_host: USB/IP Host Driver v1.0.0

下面是插入一个鼠标，有反应：

root@mityomapl138:~# usb 1-1: new low-speed USB device number 2 using ohci
usb 1-1: device descriptor read/64, error -62
usb 1-1: device descriptor read/64, error -62
usb 1-1: new low-speed USB device number 3 using ohci
usb 1-1: device descriptor read/64, error -62
usb 1-1: device descriptor read/64, error -62
usb 1-1: new low-speed USB device number 4 using ohci
usb 1-1: device not accepting address 4, error -62
usb 1-1: new low-speed USB device number 5 using ohci
usb 1-1: device not accepting address 5, error -62
hub 1-0:1.0: unable to enumerate USB device on port 1

但插入U盘，确实一点反应都没有。

请大神帮忙看看，要如何才能识别U盘啊