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XDS110 write boot_loader

Other Parts Discussed in Thread: TM4C129ENCZAD

 Excuse me
Now let me ask you a specific question.
I wrote "boot_loader.axf" for his XDS110 his JTAG
I connected the TM4C129ENCZAD to CCS via
The results are shown in the attached figure.
I get "CORTEX_M4_0: Autorun: Target will not run because symbol 'main' is not defined".
Does this mean the program is useless if the target is not running?
Also, is there a program I could write instead?
Anything that can be connected to a PC via USB is fine.