嵌入式linux下，用户模式下更新Flash内容的代码，mtdwrit.c是用户程序，mtdchar.c是内核驱动程序代码，需要和原有代码比较更新。-Embedded linux user mode code to update Flash content, mtdwrit.c is a user program, mtdchar.c is a kernel driver code, compare the needs and update the original code.