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USB(mass storage device) not getting detected on u-boot (OMAP L137 evm)

Hi ,

I have downloaded latest DaVinci-PSP-SDK-03.20.00.08.  package from TI website. I was trying to make the EVM boot using USB.

I have followed the same steps as shown in the website below for configuring the USB boot from u-boot (changes in the da830_evm.h)

http://processors.wiki.ti.com/index.php/Configuring/Building_U-Boot_for_OMAP-L137

 

My u-boot environment variables are :

bootcmd=usb start; fatload usb 0:1 0xC0700000 uImage; bootm 0xc0700000

bootargs=console=ttyS2,115200n8 noinitrd rw ip=off root=/dev/sda2 rootfstype=ext2 mem=32M

I am facing the following error with this configuration

 

U-Boot > usb start
(Re)start USB...
USB:   scanning bus for devices... No USB Device found
       scanning bus for storage devices... 0 Storage Device(s) found

Can you please suggest the solution for this.

 

thanks

Lokesh