在U-Boot中添加命令

来源：互联网发布：beowulf linux 编辑：程序博客网时间：2024/06/05 15:01

命令的结构体表示(include/command.h)

struct cmd_tbl_s {   char*name;/* Command Name*/   intmaxargs;/* maximum number of arguments*/   intrepeatable;/* autorepeat allowed?*//* Implementation function*/   int(*cmd)(struct cmd_tbl_s *, int, int, char *[]);   char*usage;/* Usage message(short)*/#ifdefCFG_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};

使用U_BOOT_CMD()这个宏来声明一个命令。
示例：

U_BOOT_CMD(flinfo,    2,    1,    do_flinfo,"flinfo  - print FLASH memory information\n","\n    - print information for all FLASH memory banks\n""flinfo N\n    - print information for FLASH memory bank # N\n");

U_BOOT_CMD宏的定义

#define Struct_Section  __attribute__ ((unused,section (".u_boot_cmd")))#ifdef  CFG_LONGHELP#define U_BOOT_CMD(name,maxargs,rep,cmd,usage,help) \cmd_tbl_t __u_boot_cmd_##name Struct_Section = {#name, maxargs, rep, cmd, usage, help}#else/* no long help info */#define U_BOOT_CMD(name,maxargs,rep,cmd,usage,help) \cmd_tbl_t __u_boot_cmd_##name Struct_Section = {#name, maxargs, rep, cmd, usage}#endif/* CFG_LONGHELP */

选择一个会编译进uboot的cmd_XXX.c文件
比如: cmd_console.c文件

………………………………………………….void do_test_addcmd(){printf("only test adding command\n");}/***************************************************/U_BOOT_CMD(coninfo,3,1,do_coninfo,"coninfo - print console devices and information\n","");U_BOOT_CMD(test_addcmd,1,1,do_test_addcmd,"test_addcmd - only test adding command \n","");

实例：

在U-Boot中添加一个打开或关闭蜂鸣器的命令：当输入buzzer open时打开蜂鸣器使它响，输入buzzer close时关闭蜂鸣器。

cmd_buzzer.c(添加在common目录下，并在Makefile添加“COBJS-y +=cmd_buzze.o”语句)：

#include <common.h>#include <command.h>#define GPD0CON ( *((volatile unsigned long *)0xE02000A0) ) #define GPD0DAT ( *((volatile unsigned long *)0xE02000A4) )void do_buzzer_addcmd(cmd_tbl_t *cmdtp, int flag, int argc,char *argv[]){GPD0CON &= 0xfffffff0;GPD0CON |= 0x00000001;//设置为输出GPD0DAT &= 0xfe;    //关闭蜂鸣器if(0 == strcmp(argv[1],"open")){GPD0DAT |= 0x01;printf("Open the buzzer\n");}else if(0 == strcmp(argv[1],"close")){GPD0DAT &= 0xfe;printf("Close the buzzer\n");}else if(0 == strcmp(argv[1],"--help"))printf ("Help:\n%s\n", cmdtp->help);elseprintf ("Usage:\n%s\n", cmdtp->usage);}U_BOOT_CMD(        buzzer,       2,      1,      do_buzzer_addcmd,        "\tbuzzer   --Close or open the buzzer \n",//命令说明"\tbuzzer  open    --Open  the buzzer\n"  //帮助信息"\tbuzzer  close   --Close the buzzer\n");

在顶层make，把生成的u-boot.bin下载到开发板上，在u-boot下运行命令。

附录（下载、烧写U-Boot步骤,s5pv210为例）：

1. 使用USB线通过DNW下载sq210_usb.bin到0xd0020010（初始化板子，使板子有一个下载环境）

2. 使用USB线通过DNW下载u-boot.bin到0x23e00000（下载到内存（RAM））

3. 烧录uboot（烧写到flash）
nand erase 0x0 0x60000
tftp 0x20008000 u-boot.bin
nand write 0x20008000 0x0 0x60000

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