There seems to be three different methods for DM644x MMS UBLs and Flasher, Sergeys UBL and host tool and TIs DVFlasher. They would have to be ported to DM6467. And then the FlashBurn Porting Kit could be purchased: http://focus.ti.com/docs/toolsw/folders/print/tmdssdsfbpk.html , but I would asume this also has to be ported.
Thanks