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Recommended to turn on CONFIG_FRAME_POINTER to aid in producing more reliable stack backtraces in gdb.
You must include a kgdb I/O driver. One of them is kgdb over serial console (kgdboc: kgdb over console, enabled by CONFIG_KGDB_SERIAL_CONSOLE)
Configure kgdboc at boot time by passing to the kernel:
kgdboc=<tty-device>,[baud]. For example: