1. Add when compiling: -march = armv4
otherwise,
volatile unsigned short *p = xxx;
*p = val; //It will be split into 2 strb operations, which is 8 bits, but we want to write 16 bits at a time
2. Turn off the timer interrupt, otherwise the CFI mode will be entered when testing NOR. If an interrupt occurs, the CPU will definitely read NOR, and then the correct instruction will not be read, causing the program to crash.
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