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data-state="expanded"><span role="button" tabindex="0" aria-labelledby="button-collapse-action concept_n3v_ttw_bzb-d4445e4354-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/file-system/file-system-user-guide.html" id="concept_n3v_ttw_bzb-d4445e4354-link">文件系统使用指南</a></div></div><ul role="group" class="navbar-nav nav-list"><li role="treeitem" class="active"><div data-tocid="file_system_rootfs-d4445e4368" class="topicref" data-id="file_system_rootfs" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/file-system/file-system-rootfs.html" id="file_system_rootfs-d4445e4368-link">RootFS 和 Overlay</a></div></div></li><li role="treeitem"><div data-tocid="id-d4445e4382" class="topicref" data-id="id" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/file-system/lb_usage_autoboot_2.html" id="id-d4445e4382-link">开机启动</a></div></div></li><li role="treeitem"><div data-tocid="file_system_division-d4445e4396" class="topicref" data-id="file_system_division" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/file-system/file-system-division.html" id="file_system_division-d4445e4396-link">配置系统分区</a></div></div></li><li role="treeitem"><div data-tocid="file_system_images-d4445e4410" class="topicref" data-id="file_system_images" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/file-system/file-system-images.html" id="file_system_images-d4445e4410-link">选择系统镜像</a></div></div></li><li role="treeitem"><div data-tocid="file_system_division_modification-d4445e4424" class="topicref" data-id="file_system_division_modification" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/file-system/file-system-division_modification.html" id="file_system_division_modification-d4445e4424-link">修改分区</a></div></div></li></ul></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="concept_mcc_32s_nbc-d4445e4438" class="topicref" data-id="concept_mcc_32s_nbc" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action concept_mcc_32s_nbc-d4445e4438-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-multi-media-sdk.html" id="concept_mcc_32s_nbc-d4445e4438-link">多媒体</a><div class="wh-tooltip"><p class="shortdesc">GE、VE、Display、DVP、MPP、MPP 播放器等多媒体模块的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="concept_nww_hzh_pzb-d4445e5947" class="topicref" data-id="concept_nww_hzh_pzb" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action concept_nww_hzh_pzb-d4445e5947-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-interface-sdk.html" id="concept_nww_hzh_pzb-d4445e5947-link">接口</a><div class="wh-tooltip"><p class="shortdesc">CAN、CIR、GPAI、GPIO、I2C、PSADC、PWM 等接口模块的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-safety-d4445e7944" class="topicref" data-id="chapter-safety" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-safety-d4445e7944-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-safety-sdk.html" id="chapter-safety-d4445e7944-link">安全</a><div class="wh-tooltip"><p class="shortdesc">SPI ENC、CE、eFuse 等安全模块的介绍和使用说明。</p></div></div></div></li></ul></li></ul></div>
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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1">
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<span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" title="Edit this document" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/file-system/file-system-rootfs.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">RootFS 和 Overlay</h1>
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<div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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<div class="- topic/body concept/conbody body conbody">
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<p class="- topic/p p" data-ofbid="d138484e33__20250123155213">使用 Buildroot 可以将需要使用的工具直接编译和安装到 RootFS， 如果希望将非依赖 Buildroot 独立编译的程序和文件放到 RootFS 中时，可使用 SDK
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提供的 RootFS Overlay 机制来实现。</p>
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<section class="- topic/section section" id="file_system_rootfs__section_ssf_qxy_c1c" data-ofbid="file_system_rootfs__section_ssf_qxy_c1c"><h2 class="- topic/title title sectiontitle">RootFS Overlay 机制</h2>
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<p class="- topic/p p" data-ofbid="d138484e41__20250123155213">RootFS Overlay 机制是指在制作 RootFS 镜像过程中，使用客制化的 RootFS 目录内容覆盖
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">output/target/</span> 中的目录和文件。通过 Overlay 机制，开发者可以将独立编译的程序和文件放在一个
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">RootFS Overlay</span> 目录中，并将该目录路径配置到对应的
|
||
<span class="+ topic/ph sw-d/filepath ph filepath"><board>_defconfig</span> 目录下，即可将所需程序和文件打包到 RootFS 镜像。</p>
|
||
<figure class="- topic/fig fig fignone" id="file_system_rootfs__fig_lnr_rxy_c1c" data-ofbid="file_system_rootfs__fig_lnr_rxy_c1c">
|
||
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="file_system_rootfs__image_tsf_qxy_c1c" src="../../../images/sdk/rootfs_overlay_mechanism.png" alt="rootfs_overlay_mechanism"/></div><br/>
|
||
<figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">RootFS Overlay 机制</span></figcaption></figure>
|
||
<p class="- topic/p p" data-ofbid="d138484e65__20250123155213">如 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="file-system-rootfs.html#file_system_rootfs__fig_lnr_rxy_c1c">RootFS Overlay 机制</a>所示，将编译过程中生成的内容安装到
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">output/target/</span> 来制作 RootFS 镜像时：</p>
|
||
<ol class="- topic/ol ol" id="file_system_rootfs__ul_vsf_qxy_c1c" data-ofbid="file_system_rootfs__ul_vsf_qxy_c1c">
|
||
<li class="- topic/li li" data-ofbid="d138484e77__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d138484e79__20250123155213">将 <span class="+ topic/ph sw-d/filepath ph filepath">output/target/</span> 目录内容 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">rsync</span> 到 RootFS
|
||
制作目录 <span class="+ topic/ph sw-d/filepath ph filepath">output/build/luban-fs/target/</span>。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d138484e92__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d138484e94__20250123155213">将指定的 RootFS Overlay 目录中的内容 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">rsync</span> 到 RootFS 制作目录
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">output/build/luban-fs/target/</span>。</p>
|
||
<p class="- topic/p p" data-ofbid="d138484e103__20250123155213">如果配置了多个 RootFS Overlay 目录，则按顺序 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">rsync</span> 覆盖
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">output/build/luban-fs/target/</span> 中的内容。</p>
|
||
</li>
|
||
</ol>
|
||
</section>
|
||
<section class="- topic/section section" id="file_system_rootfs__section_wsf_qxy_c1c" data-ofbid="file_system_rootfs__section_wsf_qxy_c1c"><h2 class="- topic/title title sectiontitle">默认 Overlay 目录</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d138484e120__20250123155213">SDK 给每个 Board 设置了一个默认的 Overlay 目录，例如
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">target/d211/fpga_spinand/rootfs_overlay</span>。按照需要的目录结构存储，可以直接预制文件。</p>
|
||
</section>
|
||
<section class="- topic/section section" id="file_system_rootfs__section_ysf_qxy_c1c" data-ofbid="file_system_rootfs__section_ysf_qxy_c1c"><h2 class="- topic/title title sectiontitle">添加新 Overlay 目录</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d138484e135__20250123155213">Luban SDK 的 Overlay 支持多目录，按照以下流程可以增加新的 Overlay 目录：</p>
|
||
<ol class="- topic/ol ol" id="file_system_rootfs__ul_zsf_qxy_c1c" data-ofbid="file_system_rootfs__ul_zsf_qxy_c1c">
|
||
<li class="- topic/li li" data-ofbid="d138484e140__20250123155213">使用下列命令进入配置界面：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="file_system_rootfs__codeblock_rwj_cyy_c1c" data-ofbid="file_system_rootfs__codeblock_rwj_cyy_c1c"><code><span class="+ topic/keyword sw-d/cmdname keyword cmdname">make menuconfig</span></code></pre></li>
|
||
<li class="- topic/li li" data-ofbid="d138484e146__20250123155213">添加系统配置，示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="file_system_rootfs__codeblock_plk_dyy_c1c" data-ofbid="file_system_rootfs__codeblock_plk_dyy_c1c"><code>System configuration --->
|
||
(target/$(LUBAN_CHIP_NAME)/$(LUBAN_BOARD_NAME)/rootfs_overlay) Root filesystem overlay directories</code></pre><p class="- topic/p p" data-ofbid="d138484e150__20250123155213"><span class="+ topic/ph sw-d/filepath ph filepath">target/$(LUBAN_CHIP_NAME)/$(LUBAN_BOARD_NAME)/rootfs_overlay</span>
|
||
为每一个板子目录下默认的 rootfs_overlay 目录。</p><div class="- topic/p p" data-ofbid="d138484e154__20250123155213">
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="file_system_rootfs__image_dtf_qxy_c1c" src="../../../images/sdk/rootfs_overlay_menuconfig.png" width="480" alt="rootfs_overlay_menuconfig"/></div><br/>
|
||
</div></li>
|
||
<li class="- topic/li li" data-ofbid="d138484e163__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d138484e165__20250123155213">添加新目录。</p>
|
||
<div class="- topic/p p" data-ofbid="d138484e168__20250123155213">RootFS Overlay 目录可以配置多个，不同目录之间使用空格分开。例如，新增一个
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">rootfs_overlay</span> 和一个 <span class="+ topic/ph sw-d/filepath ph filepath">test_rootfs</span>
|
||
目录：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="file_system_rootfs__codeblock_kqr_fyy_c1c" data-ofbid="file_system_rootfs__codeblock_kqr_fyy_c1c"><code>target/$(LUBAN_CHIP_NAME)/$(LUBAN_BOARD_NAME)/rootfs_overlay test_rootfs</code></pre></div>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d138484e180__20250123155213">
|
||
<div class="- topic/p p" data-ofbid="d138484e182__20250123155213">重新编译生成固件时的三个目录，会合并构建 RootFS：<ul class="- topic/ul ul" id="file_system_rootfs__ul_htf_qxy_c1c" data-ofbid="file_system_rootfs__ul_htf_qxy_c1c">
|
||
<li class="- topic/li li" data-ofbid="d138484e186__20250123155213"><span class="+ topic/ph sw-d/filepath ph filepath">rootfs_overlay</span> 和
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">test_rootfs</span> 中的内容被按顺序安装到
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">output/build/luban-fs/target/</span> 中。</li>
|
||
<li class="- topic/li li" data-ofbid="d138484e197__20250123155213"><span class="+ topic/ph sw-d/filepath ph filepath">output/build/luban-fs/target/</span> 内容被安装到
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">output/target/</span> 中。</li>
|
||
<li class="- topic/li li" data-ofbid="d138484e205__20250123155213">基于 <span class="+ topic/ph sw-d/filepath ph filepath">output/target/</span> 生成新的 RootFS。</li>
|
||
</ul></div>
|
||
</li>
|
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</ol>
|
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</section>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#file_system_rootfs__section_ssf_qxy_c1c" data-tocid="file_system_rootfs__section_ssf_qxy_c1c">RootFS Overlay 机制</a></div></li><li class="section-item"><div class="section-title"><a href="#file_system_rootfs__section_wsf_qxy_c1c" data-tocid="file_system_rootfs__section_wsf_qxy_c1c">默认 Overlay 目录</a></div></li><li class="section-item"><div class="section-title"><a href="#file_system_rootfs__section_ysf_qxy_c1c" data-tocid="file_system_rootfs__section_ysf_qxy_c1c">添加新 Overlay 目录</a></div></li></ul></div>
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