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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"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/advanced/fw_cmd_user_guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1"><span class="+ topic/keyword sw-d/cmdname keyword cmdname">fw_</span> 命令参考指南</h1><div class="date inPage">27 Dec 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d180299e27__20250121171625"><span class="+ topic/keyword sw-d/cmdname keyword cmdname">fw_setenv</span> 和 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">fw_printenv</span> 是用于在 Linux 系统下读取和修改 U-Boot
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环境变量的命令工具，允许用户在应用层上对 U-Boot 的环境变量进行操作，而不必直接进入 U-Boot 命令行界面。以下是 ArtInChip SDK
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编译过程中常见命令及其说明。</p><section class="- topic/section section" id="fw_cmd_user_guide_Copy__section_mb2_mlh_tdc" data-ofbid="fw_cmd_user_guide_Copy__section_mb2_mlh_tdc"><h2 class="- topic/title title sectiontitle">fw_setenv</h2>
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<div class="- topic/p p" data-ofbid="d180299e39__20250121171625">示例：<ul class="- topic/ul ul" id="fw_cmd_user_guide_Copy__ul_kqr_csl_vdc" data-ofbid="fw_cmd_user_guide_Copy__ul_kqr_csl_vdc"><li class="- topic/li li" data-ofbid="d180299e42__20250121171625">
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<div class="- topic/p p" data-ofbid="d180299e44__20250121171625">将下次系统启动分区设置为
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B。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="fw_cmd_user_guide_Copy__codeblock_lwd_dsl_vdc" data-ofbid="fw_cmd_user_guide_Copy__codeblock_lwd_dsl_vdc">fw_setenv osAB_next B</pre></div>
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</li><li class="- topic/li li" data-ofbid="d180299e49__20250121171625">
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<div class="- topic/p p" data-ofbid="d180299e51__20250121171625">将下次只读文件系统挂载分区设置为
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B。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="fw_cmd_user_guide_Copy__codeblock_l5y_dsl_vdc" data-ofbid="fw_cmd_user_guide_Copy__codeblock_l5y_dsl_vdc">fw_setenv rodataAB_next B</pre></div>
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</li><li class="- topic/li li" data-ofbid="d180299e56__20250121171625">
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<div class="- topic/p p" data-ofbid="d180299e58__20250121171625">将下次读写文件系统挂载分区设置为
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A。<pre class="+ topic/pre pr-d/codeblock pre codeblock" id="fw_cmd_user_guide_Copy__codeblock_fty_2sl_vdc" data-ofbid="fw_cmd_user_guide_Copy__codeblock_fty_2sl_vdc"><code>fw_setenv dataAB_next A</code></pre></div>
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</li></ul></div>
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</section><section class="- topic/section section" id="fw_cmd_user_guide_Copy__section_oxn_mlh_tdc" data-ofbid="fw_cmd_user_guide_Copy__section_oxn_mlh_tdc"><h2 class="- topic/title title sectiontitle">fw_printenv</h2>
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<p class="- topic/p p" data-ofbid="d180299e69__20250121171625">查看当前的环境变量设置。</p>
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<div class="- topic/p p" data-ofbid="d180299e72__20250121171625">输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock" id="fw_cmd_user_guide_Copy__codeblock_xjt_gsl_vdc" data-ofbid="fw_cmd_user_guide_Copy__codeblock_xjt_gsl_vdc"><code>MTD=spi0.0:1m(spl),256k(env),256k(env_r),4m(os),4m(os_r),12m(rodata),12m(rodata_r),40m(data),40m(data_r)
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bootlimit=5
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rodata_partname=blk_rodata
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rodata_partname_r=blk_rodata_r
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data_partname=blk_data
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data_partname_r=blk_data_r
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bootcount=1
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upgrade_available=0
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osAB_now=A # 当前系统启动分区为 A 分区
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rodataAB_now=A # 当前只读系统挂载为 A 分区
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dataAB_now=B # 当前读写系统挂载为 B 分区
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osAB_next=B # 下次系统启动分区为 B 分区
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rodataAB_next=B # 下次只读系统挂载为 B 分区
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dataAB_next=A # 下次读写系统挂载为 A 分区</code></pre></div>
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</section></div></article></main></div>
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<div class=" wh_related_links d-print-none "><nav aria-label="Related Links" role="navigation" class="- topic/related-links related-links"><div class="- topic/linklist linklist relinfo"><strong>相关信息</strong><ul class="linklist related_link"><li class="linklist"><a class="- topic/link link navheader_parent_path" href="../ota/ota_guide.html" title="OTA 方案">OTA 方案</a></li></ul></div></nav></div>
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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="#fw_cmd_user_guide_Copy__section_mb2_mlh_tdc" data-tocid="fw_cmd_user_guide_Copy__section_mb2_mlh_tdc">fw_setenv</a></div></li><li class="section-item"><div class="section-title"><a href="#fw_cmd_user_guide_Copy__section_oxn_mlh_tdc" data-tocid="fw_cmd_user_guide_Copy__section_oxn_mlh_tdc">fw_printenv</a></div></li></ul></div>
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