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TM4C123GXL usb_dev_serial not working along USB bootloader

Ishan Pardesi
Prodigy 15 points

I have been working on USB bootlaoder on the tiva launchpad and it is working accurately. But when I burn the USB_dev_serial example in Tivaware (taking care of the APP_BASE address in the .cmd(linker) file and burning the code using LM flash Programmer at correct address offset), the code does not work and gets stuck during USB device recognition.

I am using CCS v5.5, Windows 8.1 x64.

The device manager of PC shows USB Device Unrecognized ( Device Descriptor Request failed). The drivers update also fails every time( even when the driver signature check enforcement was disabled).

The offset address of the application code is 0x2800. 

My thought on this: May be the ROM_ functions can not be accessed by any arbitrary flash location but only  from initial few pages of the flash. (just a thought :) ) as the usb_Dev_serial programs uses many of them. 

Looking for help.

Thanks in advance.