Hi 543945827,
Are you using the devkit or custom board for Orin Nano?
Are you connecting PIN29/PIN30 from 40-pins expansion header?
Can your Alarm device just controlled by GPIO?
root@szse-desktop:/home/szse# busybox devmem 0x02430068
0x00000404
It seems you hit a known GPIO issue in JP6.x, please refer to the following thread to get the fix.
40hdr - SPI1 gpio padctl register bit[10] effect by gpiod tools in JP6 - Jetson & Embedded Systems / Jetson AGX Orin - NVIDIA Developer Forums
If you don’t apply the patch, gpiod command would set bit 10 and cause it not working as GPIO.