U-BOOT源码分析及移植(24)

U-BOOT源码分析及移植

int repeatable; /* autorepeat allowed? */

/* Implementation function 命令执行函数*/

int (*cmd)(struct cmd_tbl_s *, int, int, char *[]);

char *usage; /* Usage message (short) */

#ifdef CFG_LONGHELP

char *help; /* Help message (long) */

#endif

#ifdef CONFIG_AUTO_COMPLETE

/* do auto completion on the arguments */

int (*complete)(int argc, char *argv[], char last_char, int maxv, char *cmdv[]); #endif

};

typedef struct cmd_tbl_s cmd_tbl_t;

//定义section属性的结构体。编译的时候会单独生成一个名为.u_boot_cmd的section段。

#define Struct_Section __attribute__ ((unused,section (".u_boot_cmd")))

//这个宏定义一个命令结构体变量。并用name,maxargs,rep,cmd,usage,help初始化各个域。

#define U_BOOT_CMD(name,maxargs,rep,cmd,usage,help) \