【OK210试用体验】u--boot篇 -- 添加boot menu
u-boot启动过程中可以添加菜单，用来方便地实现不同的功能。添加这个功能，在顶层doc/README.bootmenu有详细的讲解。
要使能bootmenu功能，需要在include/configs/smdkv210.h中定义2个宏。- #define CONFIG_CMD_BOOTMENU
- #define CONFIG_MENU
- #define CONFIG_AUTOBOOT_KEYED
- #define CONFIG_BOOTDELAY 30
- #define CONFIG_MENU_SHOW
菜单中的内容，可以用如下格式来设置：- bootmenu_delay=
- bootmenu_="<title>=
是boot menu的进入编号，从零开始。
是在console或者boot屏显示的内容。</font></font></div><br />
<div align="left"><font style="background-color:rgb(247, 247, 247)"><font size="3"> <</font></font><font size="3">commands</font><font style="background-color:rgb(247, 247, 247)"><font size="3">>是菜单<title>对应的执行命令。</font></font></div><br />
<div align="left"><font style="background-color:rgb(247, 247, 247)"><font size="3"> 设置这些命令用setev命令，操作菜单的时候用键盘的up/dowm还有enter，选中时有高亮显示。一开始进入菜单，延迟结束后u-boot立即执行第一个菜单命令，可以按ESC或者Q键退出延迟计数，一直显示菜单，直到用户选择某个命令。</font></font></div><br />
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<p><strong>3.png</strong> <em class="xg1">(32.06 KB, 下载次数: 6)</em></p>
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<a href="https://bbs.elecfans.com/forum.php?mod=attachment&aid=MjgzMjg4fDFjOTI1ZGYzfDE3MzUzNjE5NzV8MHw1MTQzNzA%3D¬humb=yes" target="_blank">下载附件</a>
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<p class="xg1 y">2015-9-13 21:00 上传</p>
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<div align="left"><font style="background-color:rgb(247, 247, 247)"><font size="3"> 开始进入是这样子，等待几秒后就会进入自己的菜单。设置完自己的菜单后需要按下reset。</font></font></div><br />
<div align="left"><font style="background-color:rgb(247, 247, 247)"><font size="3"> 设置例子：<div class="blockcode"><div id="code_nj8"><ol><li>setenv bootmenu_0 Boot 1. kernel=bootm 0x82000000 # Set first menu entry<br />
<li> setenv bootmenu_1 Boot 2. kernel=bootm 0x83000000 # Set second menu entry<br />
<li> setenv bootmenu_2 Reset board=reset # Set third menu entry<br />
<li> setenv bootmenu_3 U-Boot boot order=boot # Set fourth menu entry<br />
<li> bootmenu 20 # Run bootmenu with autoboot delay 20s</ol></div><em onclick="copycode($('code_nj8'));">复制代码</em></div> 显示情况：
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<p><strong>4.png</strong> <em class="xg1">(18.55 KB, 下载次数: 3)</em></p>
<p>
<a href="https://bbs.elecfans.com/forum.php?mod=attachment&aid=MjgzMjkyfDcwYmIyZmI1fDE3MzUzNjE5NzV8MHw1MTQzNzA%3D¬humb=yes" target="_blank">下载附件</a>
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<p class="xg1 y">2015-9-13 21:10 上传</p>
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<p class="f14" style="margin-left:65px; padding:20px 0;"><strong>共 1 个关于 【OK210试用体验】u--boot篇 -- 添加boot menu 最后回复于 <a href="forum.php?mod=redirect&tid=514370&goto=lastpost#lastpost">2015-9-14 13:28</a></strong></p>
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<strong><a href="https://bbs.elecfans.com/user/1597845/">HelloWii</a></strong>
<em>当前离线</em>
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<em id="authorposton3822469" class="grey9 ml10">发表于 2015-9-14 13:28:30</em>
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不错。。。。
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