一、参考例子：

uboot-2010.06

二、uboot/include/configs/board_name.h

增加#define CONFIG_CMD_USR

三、uboot/common/Makefile

增加COBJS-$(CONFIG_CMD_USR) +=cmd_usr.o

四、uboot/common/

增加cmd_usr.c

五、cmd_usr.c书写格式

1 #include 2 #include 3 4 int do_cmdusr(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) 5 { 6 //自己实现的功能：例如tftp等下载、数据校验 7 } 8 9 U_BOOT_CMD(10 cmdusr, 3, 0, do_cmdusr,11 "cmdusr- user cmd\n",12 " - this is cmd, Cont     ai   ns the following s     te   ps:\n"13 " - 1...\n"14 " - 2...\n"15 " - 3...\n"16 " - 4...\n"17 );