[U-Boot] help required for usbtty at uboot level

Hi,

I'm working on USBTTY using CDC ACM at uboot level for arm v6 core as console. Procedure using as follows 1)setenv the cdc_acm to usbtty 2)Download the uboot image and Connected the mini B to target and standard A to host windows PC. Immediately PC recognizes as unknown device. 3)Then I downloaded and unzipped the WindowsTeraTermUSBDriver.zip for support the CDC ACM on host windows machine. Copied *.inf files into windows/inf, *.sys *.dll and security catalog files into windows/system32 for detecting the new hardware changes, but still USB is showing as unknown device.

I did anything wrong in connectivity? Do we have any other procedure or any patch required for windows PC for USB cable detection?

Thanks and Regards, Naveen