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id="concept_n3v_ttw_bzb-d4445e4354-link">文件系统使用指南</a></div></div></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 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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/sdmc/sdmc-faq.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">常见问题</h1>
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<div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 2 minute(s)
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<div class="- topic/body body">
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<section class="- topic/section section" id="id__section_hqv_vtt_c1c" data-ofbid="id__section_hqv_vtt_c1c"><h2 class="- topic/title title sectiontitle">MMC 初始化失败</h2>
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<div class="- topic/div div"><strong class="+ topic/ph hi-d/b ph b">现象</strong><div class="- topic/p p" data-ofbid="d142113e36__20250123155213">Linux 启动后，在扫描 mmc0 设备的时候报错 <samp class="+ topic/ph sw-d/msgph ph msgph">whilst initialising MMC
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card</samp>，log
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如下<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__pre_iqv_vtt_c1c" data-ofbid="id__pre_iqv_vtt_c1c"><code>mmc_host mmc1: Bus speed (slot <span class="hl-number">0</span>)= <span class="hl-number">204000000</span>Hz (slot req <span class="hl-number">300000</span>Hz, actual <span class="hl-number">300000</span>HZ div=<span class="hl-number">680</span>)
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mmc_host mmc0: Bus speed (slot <span class="hl-number">0</span>)= <span class="hl-number">204000000</span>Hz (slot req <span class="hl-number">25000000</span>Hz, actual <span class="hl-number">20400000</span>HZ div=<span class="hl-number">10</span>)
|
||
mmc_host mmc1: Bus speed (slot <span class="hl-number">0</span>)= <span class="hl-number">204000000</span>Hz (slot req <span class="hl-number">200000</span>Hz, actual <span class="hl-number">200000</span>HZ div=<span class="hl-number">1020</span>)
|
||
mmc0: error -<span class="hl-number">110</span> whilst initialising MMC card
|
||
mmc_host mmc0: Bus speed (slot <span class="hl-number">0</span>)= <span class="hl-number">204000000</span>Hz (slot req <span class="hl-number">300000</span>Hz, actual <span class="hl-number">300000</span>HZ div=<span class="hl-number">680</span>)
|
||
mmc_host mmc1: Bus speed (slot <span class="hl-number">0</span>)= <span class="hl-number">204000000</span>Hz (slot req <span class="hl-number">100000</span>Hz, actual <span class="hl-number">100000</span>HZ div=<span class="hl-number">2040</span>)
|
||
mmc_host mmc0: Bus speed (slot <span class="hl-number">0</span>)= <span class="hl-number">204000000</span>Hz (slot req <span class="hl-number">25000000</span>Hz, actual <span class="hl-number">20400000</span>HZ div=<span class="hl-number">10</span>)
|
||
mmc0: error -<span class="hl-number">110</span> whilst initialising MMC card
|
||
mmc_host mmc0: Bus speed (slot <span class="hl-number">0</span>)= <span class="hl-number">204000000</span>Hz (slot req <span class="hl-number">200000</span>Hz, actual <span class="hl-number">200000</span>HZ div=<span class="hl-number">1020</span>)
|
||
random: fast init <strong class="+ topic/ph hi-d/b ph b">done</strong>
|
||
mmc_host mmc0: Bus speed (slot <span class="hl-number">0</span>)= <span class="hl-number">204000000</span>Hz (slot req <span class="hl-number">25000000</span>Hz, actual <span class="hl-number">20400000</span>HZ div=<span class="hl-number">10</span>)
|
||
mmc0: error -<span class="hl-number">110</span> whilst initialising MMC card
|
||
mmc_host mmc0: Bus speed (slot <span class="hl-number">0</span>)= <span class="hl-number">204000000</span>Hz (slot req <span class="hl-number">100000</span>Hz, actual <span class="hl-number">100000</span>HZ div=<span class="hl-number">2040</span>)</code></pre></div></div>
|
||
<div class="- topic/div div"><strong class="+ topic/ph hi-d/b ph b">原因分析</strong></div>
|
||
<p class="- topic/p p" data-ofbid="d142113e51__20250123155213">修改了 DDR 频率为 408 MHz，导致 MMC 工作时钟不准。由于 DDR 和 SDMC 共用了一个父时钟，确认是否更改了 DDR
|
||
工作频率，从而导致了父时钟发生变化。</p>
|
||
<div class="- topic/p p" data-ofbid="d142113e54__20250123155213"><strong class="+ topic/ph hi-d/b ph b">解决方案</strong><ol class="- topic/ol ol" id="id__ol_kqv_vtt_c1c" data-ofbid="id__ol_kqv_vtt_c1c">
|
||
<li class="- topic/li li" data-ofbid="d142113e59__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d142113e61__20250123155213">找到并打开包含 <code class="+ topic/ph pr-d/codeph ph codeph">sdmcx</code> 节点的设备树源文件。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d142113e68__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d142113e70__20250123155213">确认 <code class="+ topic/ph pr-d/codeph ph codeph">sdmcx</code> 节点的 clock-frequency 参数配置正确。</p>
|
||
<p class="- topic/p p" data-ofbid="d142113e76__20250123155213">根据实际需求，将参数设置为合适的值。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d142113e80__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d142113e82__20250123155213">保存并编译 DTS。</p>
|
||
</li>
|
||
</ol></div>
|
||
</section>
|
||
<section class="- topic/section section" id="id__section_omh_xtt_c1c" data-ofbid="id__section_omh_xtt_c1c"><h2 class="- topic/title title sectiontitle">mmc_test 节点不存在</h2>
|
||
|
||
<div class="- topic/div div"><strong class="+ topic/ph hi-d/b ph b">现象</strong><p class="- topic/p p" data-ofbid="d142113e96__20250123155213">在 mmc_test 测试中，挂载了 debugfs 后，无法找到 testlist 测试项。</p></div>
|
||
<div class="- topic/div div"><strong class="+ topic/ph hi-d/b ph b">原因分析</strong><p class="- topic/p p" data-ofbid="d142113e102__20250123155213">mmc_test 必须要在关闭 MMC Block 选项的前提下才能运行。</p></div>
|
||
<div class="- topic/div div"><strong class="+ topic/ph hi-d/b ph b">解决方法</strong><p class="- topic/p p" data-ofbid="d142113e108__20250123155213">确认内核中的 BLOCK 配置项。 详见<a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="sdmc-test-guide.html#sdmc_test_guide__ul_qnv_yqt_c1c">软件配置</a>。 </p></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="#id__section_hqv_vtt_c1c" data-tocid="id__section_hqv_vtt_c1c">MMC 初始化失败</a></div></li><li class="section-item"><div class="section-title"><a href="#id__section_omh_xtt_c1c" data-tocid="id__section_omh_xtt_c1c">mmc_test 节点不存在</a></div></li></ul></div>
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