target remote localhost:2331
source tools/gdb_crash_extend.py
monitor reset 0
monitor halt
monitor memU32 0x401BC000 = 128;
load
eval "monitor exec SetRTTAddr %p", &_SEGGER_RTT
b main
b HardFault_Handler
b MemManage_Handler
b BusFault_Handler
b UsageFault_Handler
b ResetISR