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TM4C129CNCPDT: Flash Boot Loader Question

Part Number: TM4C129CNCPDT

Customer seems to be under the impression that TM4C129CNCPDTIR3R is pre-programmed with Code with in Flash to assist Flash Boot Loader operation.  I did not think that was the case, only the ROM Boot Loader exist but wanted to confirm  Also is there any other documentation for Flash Boot Loader?  I only saw 

Tiva C Series TM4C129x ROM User's Guide (Rev. A)

But it does not go into any details about how the ROM Bootloader works and the datasheet had more information but it did not seem complete