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<meta name="description" content="内核版本：linux-2.6.37.2 软件平台：ubuntu 10.10 硬件平台：mini2440 准备工作：busybox源码包 建立交叉编译环境，解压源码包进入目录，修改makefile文件如下 12ARCH ?= armCROSS_COMPILE ?= arm-linux- 在命令行输入make menuconfig，不作修改直接保存配置退出，然后make，最后">
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编译busybox根文件系统
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<li>内核版本：linux-2.6.37.2</li>
<li>软件平台：ubuntu 10.10</li>
<li>硬件平台：mini2440</li>
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<p>准备工作：busybox源码包</p>
<ol>
<li><p>建立交叉编译环境，解压源码包进入目录，修改<code>makefile</code>文件如下</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">ARCH ?= arm</span><br><span class="line">CROSS_COMPILE ?= arm-linux-</span><br></pre></td></tr></table></figure>
<p>在命令行输入<code>make menuconfig</code>，不作修改直接保存配置退出，然后<code>make</code>，最后输入<code>make install</code>，就会在在目录里出现<code>install</code>这个文件夹。</p>
<a id="more"></a>
</li>
<li><p>进入<code>install</code>这个根文件夹，创建以下文件 创建<code>/etc/inittab</code><br>以下是文件内容：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">::sysinit:/etc/init.d/rcS</span><br><span class="line">s3c2410_serial0::askfirst:-/bin/sh //s3c2410_serial是mini2440的串口名。</span><br><span class="line">::restart:/sbin/init</span><br><span class="line">::ctrlaltdel:/sbin/reboot</span><br><span class="line">::shutdown:/bin/umount -a -r</span><br><span class="line">::shutdown:/sbin/swapoff -a</span><br></pre></td></tr></table></figure>
<p>创建<code>/etc/init.d/rcS</code><br>并加上运行权限，以下是文件内容：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">#!/bin/sh</span><br><span class="line">ifconfig eth0 192.168.1.12</span><br><span class="line">mount -a</span><br><span class="line">mkdir /dev/pts</span><br><span class="line">mount -t devpts devpts /dev/pts</span><br><span class="line">echo /sbin/mdev > /proc/sys/kernel/hotplug</span><br><span class="line">mdev -s</span><br></pre></td></tr></table></figure>
<p>创建<code>/dev/fstab</code><br>以下是文件内容：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"># device mount-point type options dump fsck order</span><br><span class="line">proc /proc proc defaults 0 0</span><br><span class="line">tmpfs /tmp tmpfs defaults 0 0</span><br><span class="line">sysfs /sys sysfs defaults 0 0</span><br><span class="line">tmpfs /dev tmpfs defaults 0 0</span><br></pre></td></tr></table></figure>
<p>在<code>/dev</code>下用<code>mknod</code>创建以下节点</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">mknod console c 5 1</span><br><span class="line">mknod null c 1 3</span><br><span class="line">mknod ttySAC0 c 204 64</span><br><span class="line">mknod mtdblock0 b 31 0</span><br><span class="line">mknod mtdblock1 b 31 1</span><br><span class="line">mknod mtdblock2 b 31 2</span><br><span class="line">mknod mtdblock3 b 31 3</span><br></pre></td></tr></table></figure>
<p>注意：我的mini2440在<code>common-smdk.c</code>上是有4个区，所以对应<code>mtdblock</code>也有4个。<br>在根文件系统中创建其他空目录如下：<br><code>mkdir proc mnt tmp sys root</code></p>
</li>
<li><p>用<code>mkyaffs2image</code>把文件夹封装，这里要注意的是nand flash为64M的mini2440板用<code>mkyaffs2image</code>命令就可以了，128M或以上的要用<code>mkyaffs2image-128M</code>来封装，不然会出错。</p>
</li>
</ol>
<p>这就是最简单的根文件系统，虽然配置起来不难，但是后面在根文件系统中设置环境变量才是重点。</p>
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