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TM4C123GH6PM: Question about boot process of Tiva MCU

Part Number: TM4C123GH6PM

Hello,

I would like to ask about boot process of Tiva TM4C123GH6PM.

I can program and debug by using CCS on our custom board.
But,the program would not start when standalone(not connected
Jtag debugger ( the debugger is XDS100v2) ).
I checked the Bootcfg register ,and the value is H'FFFFFFFE.

And, another custom board can start the program standalone.

What are the possible causes?

Regards,
Hiroyasu Matsubara