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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/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>
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<div class="date inPage">15 Jan 2024</div><div style="color: gray;"></div>
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<div class="- topic/body concept/conbody body conbody">
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<p class="- topic/p p" data-ofbid="d136630e33__20250123155213">初始的环境变量设置有两种方式：</p>
|
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<ul class="- topic/ul ul" id="concept_ndp_fl3_pzb__ul_fvx_11h_bzb" data-ofbid="concept_ndp_fl3_pzb__ul_fvx_11h_bzb">
|
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<li class="- topic/li li" data-ofbid="d136630e38__20250123155213">
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<p class="- topic/p p" data-ofbid="d136630e40__20250123155213">源文件文件中设置默认的环境变量内容</p>
|
||
<p class="- topic/p p" data-ofbid="d136630e43__20250123155213">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
|
||
<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">
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<li class="- topic/li li" data-ofbid="d136630e51__20250123155213">
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<p class="- topic/p p" data-ofbid="d136630e53__20250123155213"><span class="+ topic/ph sw-d/filepath ph filepath">include/env_default.h</span></p>
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<li class="- topic/li li" data-ofbid="d136630e58__20250123155213">
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<p class="- topic/p p" data-ofbid="d136630e60__20250123155213"><span class="+ topic/ph sw-d/filepath ph filepath">env/common.c</span></p>
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</li>
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<li class="- topic/li li" data-ofbid="d136630e65__20250123155213">
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<p class="- topic/p p" data-ofbid="d136630e67__20250123155213"><span class="+ topic/ph sw-d/filepath ph filepath">include/configs/qemu-riscv.h</span></p>
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</li>
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</ul>
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<p class="- topic/p p" data-ofbid="d136630e73__20250123155213">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
|
||
<kbd class="+ topic/ph sw-d/userinput ph userinput">default_environment</kbd> 中的内容，并且会将
|
||
<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，
|
||
后续的启动都从存储设备上读取环境变量。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d136630e83__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d136630e85__20250123155213">独立的环境变量文件</p>
|
||
<p class="- topic/p p" data-ofbid="d136630e88__20250123155213">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>
|
||
对该文件进行编译，生成可烧录的环境变量二进制文件。</p>
|
||
<p class="- topic/p p" data-ofbid="d136630e94__20250123155213">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="d136630e99__20250123155213">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>
|
||
值为空。 环境变量文件路径为:</p>
|
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<ul class="- topic/ul ul" id="concept_ndp_fl3_pzb__ul_hvx_11h_bzb" data-ofbid="concept_ndp_fl3_pzb__ul_hvx_11h_bzb">
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<li class="- topic/li li" data-ofbid="d136630e107__20250123155213">
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<p class="- topic/p p" data-ofbid="d136630e109__20250123155213"><span class="+ topic/ph sw-d/filepath ph filepath">target/<IC>/common/env.txt</span></p>
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