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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/boot/environment-variables.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">环境变量</h1><div class="date inPage">19 Feb 2024</div><div style="color: gray;"></div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d95248e22__20250121171533">本章描述 U-Boot 中关于环境变量的关键内容，以及 ArtInChip 平台中对环境变量的使用方式。 关于 U-Boot 环境变量的更多内容，可以参考官方文档 <a href="http://www.denx.de/wiki/DULG/Manual" target="_blank" rel="external noopener"><span class="- topic/ph ph">http://www.denx.de/wiki/DULG/Manual</span></a></p><div class="- topic/p p" data-ofbid="d95248e27__20250121171533">U-Boot 环境变量是保存在非易失性存储(NVM)上的文本数据块，系统启动时会被拷贝到内存中使用。 环境变量中保存了系统的相关配置信息，使用过程中相关的配置可以被读写。
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环境变量的数据存储格式简单，内容通过 CRC32
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进行保护：<span class="+ topic/ph sw-d/filepath ph filepath">include/env_internal.h</span><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_lbx_3n3_pzb__codeblock_amg_2jg_m1c" data-ofbid="concept_lbx_3n3_pzb__codeblock_amg_2jg_m1c"><strong class="hl-keyword">typedef</strong> <strong class="hl-keyword">struct</strong> environment_s {
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uint32_t crc; <em class="hl-comment">/* CRC32 over data bytes */</em>
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#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
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<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">char</strong> flags; <em class="hl-comment">/* active/obsolete flags ENVF_REDUND_ */</em>
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#endif
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<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">char</strong> data[ENV_SIZE]; <em class="hl-comment">/* Environment data */</em>
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} env_t;</pre></div><p class="- topic/p p" data-ofbid="d95248e33__20250121171533">其中 <code class="+ topic/ph pr-d/codeph ph codeph">data</code> 存放的是一系列以 <code class="+ topic/ph pr-d/codeph ph codeph">NULL</code> 结束的环境变量字符串。</p></div></article></main></div>
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