启动内核打出来的信息如下：
eth0: dm9000a at a0816000,a082000c IRQ 39 MAC: 00:09:c0:ff:ec:48 (platform data)
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
s5p-ehci s5p-ehci: S5P EHCI Host Controller
s5p-ehci s5p-ehci: new USB bus registered, assigned bus number 1
s5p-ehci s5p-ehci: irq 87, io mem 0xec200000
s5p-ehci s5p-ehci: USB 0.0 started, EHCI 1.00
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: S5P EHCI Host Controller
usb usb1: Manufacturer: Linux 3.3.5 ehci_hcd
usb usb1: SerialNumber: s5p-ehci
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
s5p-ohci s5p-ohci: s5p OHCI Host Controller
s5p-ohci s5p-ohci: new USB bus registered, assigned bus number 2
s5p-ohci s5p-ohci: irq 87, io mem 0xec300000
usb usb2: New USB device found, idVendor=1d6b, idProduct=0001
usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb2: Product: s5p OHCI Host Controller
usb usb2: Manufacturer: Linux 3.3.5 ohci_hcd
usb usb2: SerialNumber: s5p-ohci
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 1 port detected
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
usbcore: registered new interface driver usbserial
usbserial: USB Serial Driver core
mousedev: PS/2 mouse device common for all mice
input: s5pv210-keypad as /devices/platform/s5pv210-keypad/input/input0
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
TCP cubic registered
NET: Registered protocol family 17
NET: Registered protocol family 15
lib80211: common routines for IEEE802.11 drivers
VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 2
dm9000 dm9000: eth0: link up, 100Mbps, full-duplex, lpa 0x41E1
IP-Config: Complete:
device=eth0, addr=192.168.1.30, mask=255.255.255.0, gw=192.168.1.100,
host=192.168.1.30, domain=, nis-domain=(none),
bootserver=192.168.1.100, rootserver=192.168.1.100, rootpath=
hub 1-0:1.0: over-current condition on port 1
hub 2-0:1.0: over-current condition
nfs: server 192.168.1.100 not responding, still trying
nfs: server 192.168.1.100 OK
VFS: Mounted root (nfs filesystem) on device 0:12.
Freeing init memory: 148K
然后：
[root@Smart210 /]# cat /proc/bus/usb/devices
T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 1
B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=1d6b ProdID=0001 Rev= 3.03
S: Manufacturer=Linux 3.3.5 ohci_hcd
S: Product=s5p OHCI Host Controller
S: SerialNumber=s5p-ohci
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA （我怀疑是这里的原因导致 over-current）
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms
T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 1
B: Alloc= 0/800 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=1d6b ProdID=0002 Rev= 3.03
S: Manufacturer=Linux 3.3.5 ehci_hcd
S: Product=S5P EHCI Host Controller
S: SerialNumber=s5p-ehci
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 4 Ivl=256ms
各位老大有没有遇到这个问题，求赐教！
