CMD配置位于config_cmd_default.h configs/at91/sam9g10ek.h
头文件位于include/command.h
41 struct cmd_tbl_s {
42 char *name; /* Command Name */ 43 int maxargs; /* maximum number of arguments */ 44 int repeatable; /* autorepeat allowed? */ 45 /* Implementation function */ 46 int (*cmd)(struct cmd_tbl_s *, int, int, char *[]); 47 char *usage; /* Usage message (short) */ 48 #ifdef CFG_LONGHELP 49 char *help; /* Help message (long) */ 50 #endif 51 #ifdef CONFIG_AUTO_COMPLETE 52 /* do auto completion on the arguments */ 53 int (*complete)(int argc, char *argv[], char last_char, int maxv, ch ar *cmdv[]); 54 #endif 55 }; 56 57 typedef struct cmd_tbl_s cmd_tbl_t;71 /*
72 * Monitor Command 73 * 74 * All commands use a common argument format: 75 * 76 * void function (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]); 77 */ 78 79 typedef void command_t (cmd_tbl_t *, int, int, char *[]);89 #define Struct_Section __attribute__ ((unused,section (".u_boot_cmd")))
91 #ifdef CFG_LONGHELP
92 93 #define U_BOOT_CMD(name,maxargs,rep,cmd,usage,help) \ 94 cmd_tbl_t __u_boot_cmd_##name Struct_Section = {#name, maxargs, rep, cmd, usage, help} 95 96 #else /* no long help info */ 97 98 #define U_BOOT_CMD(name,maxargs,rep,cmd,usage,help) \ 99 cmd_tbl_t __u_boot_cmd_##name Struct_Section = {#name, maxargs, rep, cmd, usage}100 101 #endif /* CFG_LONGHELP */以最简单的命令ersion为例介绍：
位于lib_arm/board.c
75 const char version_string[] =
76 U_BOOT_VERSION" (" __DATE__ " - " __TIME__ ")"CONFIG_IDENT_STRING;common/command.c
31 int
32 do_version (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) 33 { 34 extern char version_string[]; 35 printf ("\n%s\n", version_string); 36 return 0; 37 } 38 39 U_BOOT_CMD( 40 version, 1, 1, do_version, 41 "version - print monitor version\n", 42 NULL 43 ); 44