嵌入式linux系统的全程喂狗方法，从bootloader到内核启动-Embedded linux system feed the dog the whole way, from the bootloader to boot the kernel

正常时流水灯循环闪烁,复位时四个LED全亮,当不及时喂狗即产生复位信号,流水灯闪烁会被打断.-Normal water cycle flashing lights, reset all four LED lights, feed the dog that is not timely when a reset signal, flashing light water will be interrupted.

一个看门狗进程的代码。打开看门狗后进行喂狗，喂5次后停止喂狗，看开发板会不会重启。-A watchdog daemon code. Open watchdog and then feed the dog, fed five times then stop feeding the dog, see whether will the development board restart.