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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/configure-default-environment-variable.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">初始环境变量设置</h1><div class="date inPage">4 Dec 2024</div><div style="color: gray;"></div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d286333e23__20250121171755">初始的环境变量设置有两种方式：</p><ul class="- topic/ul ul" id="concept_ndp_fl3_pzb__ul_fvx_11h_bzb" data-ofbid="concept_ndp_fl3_pzb__ul_fvx_11h_bzb"><li class="- topic/li li" data-ofbid="d286333e26__20250121171755">
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<p class="- topic/p p" data-ofbid="d286333e28__20250121171755">源文件文件中设置默认的环境变量内容</p>
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<p class="- topic/p p" data-ofbid="d286333e31__20250121171755">这种方式是通过具体平台的配置头文件，定义各个环境变量的初始化设置宏，然后在编译的时候展开到全局变量
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<kbd class="+ topic/ph sw-d/userinput ph userinput">default_environment</kbd> 中。具体可以参考：</p>
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<ul class="- topic/ul ul" id="concept_ndp_fl3_pzb__ul_gvx_11h_bzb" data-ofbid="concept_ndp_fl3_pzb__ul_gvx_11h_bzb"><li class="- topic/li li" data-ofbid="d286333e38__20250121171755">
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<p class="- topic/p p" data-ofbid="d286333e40__20250121171755"><span class="+ topic/ph sw-d/filepath ph filepath">include/env_default.h</span></p>
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</li><li class="- topic/li li" data-ofbid="d286333e44__20250121171755">
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<p class="- topic/p p" data-ofbid="d286333e46__20250121171755"><span class="+ topic/ph sw-d/filepath ph filepath">env/common.c</span></p>
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</li><li class="- topic/li li" data-ofbid="d286333e50__20250121171755">
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<p class="- topic/p p" data-ofbid="d286333e52__20250121171755"><span class="+ topic/ph sw-d/filepath ph filepath">include/configs/qemu-riscv.h</span></p>
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</li></ul>
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<p class="- topic/p p" data-ofbid="d286333e57__20250121171755">这种方式的好处是，烧录固件时不需要烧录环境变量内容，留空即可。启动过程中，U-Boot 检查设备上的环境变量不合法， 则会使用
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<kbd class="+ topic/ph sw-d/userinput ph userinput">default_environment</kbd> 中的内容，并且会将
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<kbd class="+ topic/ph sw-d/userinput ph userinput">default_environment</kbd> 中的内容主动写入到存储设备上，
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后续的启动都从存储设备上读取环境变量。</p>
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</li><li class="- topic/li li" data-ofbid="d286333e66__20250121171755">
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<p class="- topic/p p" data-ofbid="d286333e68__20250121171755">独立的环境变量文件</p>
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<p class="- topic/p p" data-ofbid="d286333e71__20250121171755">这种方式将初始的环境变量内容，以文本的形式保存为单独的文件，编译镜像的过程中，使用 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">mk env image</span>
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对该文件进行编译，生成可烧录的环境变量二进制文件。</p>
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<p class="- topic/p p" data-ofbid="d286333e77__20250121171755">在做固件烧录时，需要将该二进制文件烧录到预设的分区。</p>
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</li></ul><p class="- topic/p p" data-ofbid="d286333e80__20250121171755">ArtInChip 平台的初始环境变量通过独立的环境变量文件进行配置，源码中的默认环境变量 <span class="+ topic/keyword pr-d/parmname keyword parmname">default_environment</span>
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值为空。 环境变量文件路径为:</p><ul class="- topic/ul ul" id="concept_ndp_fl3_pzb__ul_hvx_11h_bzb" data-ofbid="concept_ndp_fl3_pzb__ul_hvx_11h_bzb"><li class="- topic/li li" data-ofbid="d286333e86__20250121171755">
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<p class="- topic/p p" data-ofbid="d286333e88__20250121171755"><span class="+ topic/ph sw-d/filepath ph filepath">target/<IC>/common/env.txt</span></p>
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