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the prebuilt uboot couldn't find the Ethernet device in Beagleboard XM

Hi,

When I put the prebuilt MLO, uboot and uImage to a SD card for booting up the Beagleboard, I found that the u-boot couldn't find the Ethernet Device which is supported by the SMSC USB chip.

Here is the output when I enter "usb reset " under u-boot prompt:

U-Boot 2011.09 (Dec 19 2011 - 14:25:08)                                        
                                                                               
OMAP3630/3730-GP ES1.2, CPU-OPP2, L3-165MHz, Max CPU Clock 1 Ghz               
OMAP3 Beagle board + LPDDR/NAND                                                
I2C:   ready                                                                   
DRAM:  512 MiB                                                                 
NAND:  HW ECC [Kernel/FS layout] selected                                      
0 MiB                                                                          
MMC:   OMAP SD/MMC: 0                                                          
*** Warning - readenv() failed, using default environment                      
                                                                               
In:    serial                                                                  
Out:   serial                                                                  
Err:   serial                                                                  
Beagle xM Rev C                                                                
No EEPROM on expansion board                                                   
Die ID #3a0600029ff80000016830c405013006                                       
Net:   Net Initialization Skipped                                              
No ethernet found.                                                             
Hit any key to stop autoboot:  0                                               
OMAP3 beagleboard.org # usb reset                                              
(Re)start USB...                                                               
USB:   Register 1313 NbrPorts 3                                                
USB EHCI 1.00                                                                  
scanning bus for devices... EHCI timed out on TD - token=0x80008c80            
2 USB Device(s) found                                                          
       scanning bus for storage devices... 0 Storage Device(s) found           
       scanning bus for ethernet devices... 0 Ethernet Device(s) found         
OMAP3 beagleboard.org #

Anybody can advise?

Cheers,
Elvin