Hello Ramanathan,
Did you try the loopback method that was suggested earlier.
You could do the comparison of the interrupt despatcher code that you had created with the CSL implementation.
Also In your gel file its observed that the PLL_CNTL1 (IOaddress=0x1C20) is set to 0x8004. This looks incorrect and it has to be 0x8BE8 for generating System clock of 100Mhz clock.
Looks like TX Intr generated in your code, and when Loopback is enabled RX data ready is set. (used C5515 gel file).
Hope you could check your code as suggested above.
Regards
Vasanth