I'm not sure why you need to use the JTAG, your OSD's bootloader crashed? you can't see anything from TV?
If you want to use the JTAG to re-burn the OSD:
Fisrt you need a emulator, and maybe need a adapter connect the emulator to the OSD.
Second you need a code composer(such as ti CCS) which can drive the emulator.
then you can do what you want.
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