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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic topic" 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/sdmc/sdmc-faq.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">常见问题</h1><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><div class="- topic/body body"><section class="- topic/section section" id="id__sd" data-ofbid="id__sd"><h2 class="- topic/title title sectiontitle">SD 卡初始化失败</h2>
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<div class="- topic/div div section" id="id__id2">
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<strong class="+ topic/ph hi-d/b ph b">现象</strong>
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<p class="- topic/p p" data-ofbid="d197013e29__20250121171632">启动后，SDMC 驱动初始化完成，但是 mount SD 卡时报错。</p></div>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_tlx_cyh_bdc" data-ofbid="id__codeblock_tlx_cyh_bdc">[I] aic_sdmc_probe()<span class="hl-number">571</span> SDMC1 driver loaded
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Reboot action: Worm-Reset, reason: Extend-Reset
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Startup time: <span class="hl-number">50.556</span> sec (from Power-On-Reset)
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<span class="hl-number">01</span>-<span class="hl-number">01</span> <span class="hl-number">08</span>:<span class="hl-number">59</span>:<span class="hl-number">23</span> I/SDIO: SD card capacity <span class="hl-number">30547968</span> KB.
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<span class="hl-number">01</span>-<span class="hl-number">01</span> <span class="hl-number">08</span>:<span class="hl-number">59</span>:<span class="hl-number">23</span> I/SDMC: SDMC1 BW <span class="hl-number">1</span>, sclk <span class="hl-number">50400</span> KHz, clk <span class="hl-number">25000</span> KHz(<span class="hl-number">25200</span> KHz), div <span class="hl-number">1</span>-<span class="hl-number">1</span>
|
||
|
||
[I] aic_sdmc_set_iocfg()<span class="hl-number">423</span> SDMC1 Buswidth <span class="hl-number">4</span>, DDR mode <span class="hl-number">0</span>, Current clock: <span class="hl-number">25000</span> KHz
|
||
found part[<span class="hl-number">0</span>], begin: <span class="hl-number">512</span>, size: <span class="hl-number">4194303.1023</span> GB # 关键信息
|
||
<span class="hl-number">01</span>-<span class="hl-number">01</span> <span class="hl-number">08</span>:<span class="hl-number">59</span>:<span class="hl-number">23</span> I/SDIO: try to mount file system!
|
||
can<span class="hl-string">'t find device:sd0p0 to be mounted.
|
||
</span><span class="hl-number">01</span>-<span class="hl-number">01</span> <span class="hl-number">08</span>:<span class="hl-number">59</span>:<span class="hl-number">23</span> I/SDIO: try to mount file system!
|
||
<span class="hl-number">01</span>-<span class="hl-number">01</span> <span class="hl-number">08</span>:<span class="hl-number">59</span>:<span class="hl-number">23</span> E/DFS: mount fs[elm] device[sd0] to / failed.
|
||
</pre>
|
||
<div class="- topic/div div section" id="id__id3">
|
||
<strong class="+ topic/ph hi-d/b ph b">原因分析</strong>
|
||
<p class="- topic/p p" data-ofbid="d197013e40__20250121171632">SD 卡采用了 GPT（GUID Partition Table）格式的分区表，而 RT-Thread 的 FatFS 目前只支持 MBR（Master Boot
|
||
Record）格式的分区表。</p><p class="- topic/p p" data-ofbid="d197013e42__20250121171632">在关键信息
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">foundpart[0],begin:512,size:4194303.1023GB</code> 之前，扫描到 SD 卡容量是
|
||
32 GB：<code class="+ topic/ph pr-d/codeph ph codeph">30547968KB</code>, 容量和上面的分区 0 大小不符。</p></div>
|
||
<div class="- topic/div div"><strong class="+ topic/ph hi-d/b ph b">解决方案</strong><p class="- topic/p p" data-ofbid="d197013e54__20250121171632">备份好 SD 卡的数据后，<strong class="+ topic/ph hi-d/b ph b">以管理员身份</strong> 运行 AiBurn，在“格式化 SD 卡” 处选择 MBR
|
||
分区表格式：</p><figure class="- topic/fig fig fignone" id="id__fig_i2r_3kh_tdc" data-ofbid="id__fig_i2r_3kh_tdc"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_wlx_cyh_bdc" src="../../../images/sdmc/format_sdcard.png" width="576" alt="format_sdcard"/></div><br/></figure></div>
|
||
</section><section class="- topic/section section" id="id__u-sd" data-ofbid="id__u-sd"><h2 class="- topic/title title sectiontitle">U 盘和 SD 卡不能同时挂载</h2>
|
||
|
||
<div class="- topic/div div section" id="id__id4">
|
||
<strong class="+ topic/ph hi-d/b ph b">现象</strong>
|
||
<p class="- topic/p p" data-ofbid="d197013e74__20250121171632">配置好 U 盘挂载功能和 SD 卡挂载功能，单独插入 U 盘或 SD 卡，可正常使用，同时插入后，无法同时使用。</p></div>
|
||
<div class="- topic/div div section" id="id__id5">
|
||
<strong class="+ topic/ph hi-d/b ph b">原因分析</strong>
|
||
<p class="- topic/p p" data-ofbid="d197013e82__20250121171632">SDK 默认配置中，对于文件系统挂载的数量和类型做了限制以节约资源。 通常情况下,进入 menuconfig 配置菜单修改如下两个 DFS 的配置即可同时挂载 U
|
||
盘和 SD 卡。</p></div>
|
||
<div class="- topic/div div section" id="id__id6">
|
||
<strong class="+ topic/ph hi-d/b ph b">数量及类型</strong>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_xlx_cyh_bdc" data-ofbid="id__codeblock_xlx_cyh_bdc">Rt-Thread options --->
|
||
RT-Thread Components --->
|
||
[*] DFS: device virtual file system --->
|
||
(<span class="hl-number">16</span>) The maximal number of mounted file system
|
||
(<span class="hl-number">8</span>) The maximal number of file system type
|
||
</pre></div>
|
||
<div class="- topic/div div section" id="id__id7">
|
||
<strong class="+ topic/ph hi-d/b ph b">卷数量</strong>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_ylx_cyh_bdc" data-ofbid="id__codeblock_ylx_cyh_bdc">Rt-Thread options --->
|
||
RT-Thread Components --->
|
||
[*] DFS: device virtual file system --->
|
||
[*] Enable elm-chan fatfs
|
||
elm-chan<span class="hl-string">'s FatFs, Generic FAT Filesystem Module --->
|
||
</span> (<span class="hl-number">8</span>) Number of volumes (logical drives) to be used.
|
||
</pre></div>
|
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</section></div></article></main></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__sd" data-tocid="id__sd">SD 卡初始化失败</a></div></li><li class="section-item"><div class="section-title"><a href="#id__u-sd" data-tocid="id__u-sd">U 盘和 SD 卡不能同时挂载</a></div></li></ul></div>
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