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CCS/TM4C1294NCPDT: USB problem when using in boot-loader mode

Part Number: TM4C1294NCPDT

Tool/software: Code Composer Studio

Dear All,

   I am using TM4C1294NCPDT for one of my project in which there is one application which we are running on our MCU and this application is interfaced with GUI which is running on my LAPTOP and we are using USB to communicate through GUI. Everything is working fine when we are running the code without using boot-loader as virtual com port is created and communication with GUI is running fine. But when we are changing the APP_BASE address from  0x00000000 to 0x00008000 for using this Application to work with USB based boot-loader my application is running fine but  the communication with GUI is some how broken but I can see that virtual comport is created but my GUI is not able to communicate with my MCU anymore. I think there is some problem with my GUI so i tried it with some other application such as Hyperterminal and Docklight but it is not communicating with these as well.

Is some changes required in code as I am not able to debug this problem. Please let me know the possible solution for this. Prompt reply will be appreciated.

Thanks & Regards

Parvez Alam