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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/cmu/cmu-debug-guide-lb.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">调试指南</h1>
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<div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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<div class="- topic/p p" data-ofbid="d207127e33__20250123155223">CMU 调试包含以下步骤：<ol class="- topic/ol ol" id="concept_jq3_rn3_pzb__ol_ykn_4xr_c1c" data-ofbid="concept_jq3_rn3_pzb__ol_ykn_4xr_c1c">
|
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<li class="- topic/li li" data-ofbid="d207127e37__20250123155223">确保打开 <span class="+ topic/keyword pr-d/parmname keyword parmname">Debugfs</span>。SDK 中默认已打开
|
||
<span class="+ topic/keyword pr-d/parmname keyword parmname">Debugfs</span>，也可以通过以下配置打开：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_jq3_rn3_pzb__codeblock_z3x_4ht_q1c" data-ofbid="concept_jq3_rn3_pzb__codeblock_z3x_4ht_q1c"><code>Kernel hacking--->
|
||
Generic Kernel Debugging Instruments--->
|
||
Debug Filesystem
|
||
Debugfs <strong class="hl-keyword">default</strong> access(Access normal)---></code></pre><p class="- topic/p p" data-ofbid="d207127e47__20250123155223">内核的 CCF
|
||
框架中定义了用于调试的接口，如需调试，仅需打开 <span class="+ topic/keyword pr-d/parmname keyword parmname">Debugfs</span> 开关即可。</p></li>
|
||
<li class="- topic/li li" data-ofbid="d207127e53__20250123155223">保存配置并重新编译内核。</li>
|
||
<li class="- topic/li li" data-ofbid="d207127e56__20250123155223">通过以下命令将 <span class="+ topic/keyword pr-d/parmname keyword parmname">Debugfs</span>
|
||
挂载到<span class="+ topic/ph sw-d/filepath ph filepath">/sys/kernel/debug</span>。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_jq3_rn3_pzb__codeblock_hw2_pht_q1c" data-ofbid="concept_jq3_rn3_pzb__codeblock_hw2_pht_q1c"><code>mount -t debugfs none /sys/kernel/debug</code></pre><p class="- topic/p p" data-ofbid="d207127e66__20250123155223">内核启动后，<code class="+ topic/ph pr-d/codeph ph codeph">Debugfs</code>
|
||
默认未挂载。</p></li>
|
||
<li class="- topic/li li" data-ofbid="d207127e72__20250123155223">按以下步骤调试 Clock Debugfs：<ol class="- topic/ol ol" type="a" id="concept_jq3_rn3_pzb__ol_ash_sxr_c1c" data-ofbid="concept_jq3_rn3_pzb__ol_ash_sxr_c1c">
|
||
<li class="- topic/li li" data-ofbid="d207127e76__20250123155223">打开 <span class="+ topic/keyword pr-d/parmname keyword parmname">Debugfs</span>
|
||
目录：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_jq3_rn3_pzb__codeblock_hg3_pht_q1c" data-ofbid="concept_jq3_rn3_pzb__codeblock_hg3_pht_q1c"><code>cd /sys/kernel/debug/clk</code></pre><p class="- topic/p p" data-ofbid="d207127e83__20250123155223">该目录存储了内核中注册的所有时钟。使用
|
||
<span class="+ topic/keyword sw-d/cmdname keyword cmdname">ls</span> 命令可查看所有注册的时钟：</p><div class="- topic/p p" data-ofbid="d207127e88__20250123155223">
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="concept_jq3_rn3_pzb__image_w1q_mxr_c1c" src="../../../images/cmu/cmu_clk_debugfs_dir.png" width="384" alt="clk_dir"/></div><br/>
|
||
</div></li>
|
||
<li class="- topic/li li" data-ofbid="d207127e97__20250123155223">通过 summary
|
||
结点打印系统的时钟树。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_jq3_rn3_pzb__codeblock_h2p_pht_q1c" data-ofbid="concept_jq3_rn3_pzb__codeblock_h2p_pht_q1c"><code>cat clk_summary</code></pre><p class="- topic/p p" data-ofbid="d207127e101__20250123155223">Summary
|
||
结点位于 <span class="+ topic/ph sw-d/filepath ph filepath">/sys/kernel/debug/clk</span>
|
||
目录下。系统时钟树会显示系统中各个时钟的父子关系、频率和使能计数等信息：</p><div class="- topic/p p" data-ofbid="d207127e106__20250123155223">
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="concept_jq3_rn3_pzb__image_z1q_mxr_c1c" src="../../../images/cmu/cmu_clock_tree.png" width="480" alt="clock_tree1"/></div><br/>
|
||
</div></li>
|
||
<li class="- topic/li li" data-ofbid="d207127e115__20250123155223">除了在时钟树中查看时钟的频率，也可以通过各个时钟，单独查询其时钟频率。以 uart0 为例进行：<ol class="- topic/ol ol" type="i" id="concept_jq3_rn3_pzb__ol_gk1_b14_mdc" data-ofbid="concept_jq3_rn3_pzb__ol_gk1_b14_mdc">
|
||
<li class="- topic/li li" data-ofbid="d207127e119__20250123155223">在 <span class="+ topic/ph sw-d/filepath ph filepath">/sys/kernel/debug/clk</span> 目录中，打开
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">uart0</span> 目录。<p class="- topic/p p" data-ofbid="d207127e127__20250123155223">在
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">uart0</span> 目录中，可以看到一系列结点，并能显示 uart0
|
||
时钟的各个属性。</p><div class="- topic/p p" data-ofbid="d207127e132__20250123155223">
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="concept_jq3_rn3_pzb__image_bbq_mxr_c1c" src="../../../images/uart/uart0_node.png" width="432" alt="uart0_node"/></div><br/>
|
||
</div></li>
|
||
<li class="- topic/li li" data-ofbid="d207127e141__20250123155223">
|
||
<p class="- topic/p p" data-ofbid="d207127e143__20250123155223">执行 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">cat clk_rate</span> 命令读取 uart0 的时钟频率：</p>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_jq3_rn3_pzb__codeblock_xyw_pht_q1c" data-ofbid="concept_jq3_rn3_pzb__codeblock_xyw_pht_q1c"><code></code></pre>
|
||
<div class="- topic/p p" data-ofbid="d207127e151__20250123155223">
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="concept_jq3_rn3_pzb__image_dbq_mxr_c1c" src="../../../images/uart/uart0_rate.png" width="240" alt="uart0_rate"/></div><br/>
|
||
</div>
|
||
</li>
|
||
</ol></li>
|
||
<li class="- topic/li li" data-ofbid="d207127e162__20250123155223">设置 <span class="+ topic/keyword pr-d/parmname keyword parmname">clk_rate</span>。<div class="- topic/p p" data-ofbid="d207127e167__20250123155223">默认情况下，<span class="+ topic/keyword pr-d/parmname keyword parmname">clk_rate</span>
|
||
结点为只读，即只能读取时钟频率而不能设置频率。如需设置频率，需将 <span class="+ topic/keyword pr-d/parmname keyword parmname">clk_rate</span>
|
||
的属性改为读写属性。具体设置如下：<ol class="- topic/ol ol" type="i" id="concept_jq3_rn3_pzb__ol_hzj_yxr_c1c" data-ofbid="concept_jq3_rn3_pzb__ol_hzj_yxr_c1c">
|
||
<li class="- topic/li li" data-ofbid="d207127e177__20250123155223">打开 menuconfig 中的下列配置，生成宏
|
||
DEBUG：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_jq3_rn3_pzb__codeblock_sr1_qht_q1c" data-ofbid="concept_jq3_rn3_pzb__codeblock_sr1_qht_q1c"><code>Kernel hacking--->
|
||
ArtInChip Debug--->
|
||
[*] CMU driver debug</code></pre><p class="- topic/p p" data-ofbid="d207127e181__20250123155223">在编译时，会根据该宏在
|
||
gcc 的-D 选项参数后定义宏 DEBUGFS。</p></li>
|
||
<li class="- topic/li li" data-ofbid="d207127e184__20250123155223">
|
||
<p class="- topic/p p" data-ofbid="d207127e186__20250123155223">在源码 <span class="+ topic/ph sw-d/filepath ph filepath">drivers/clk/clk.c</span> 文件中，注释
|
||
<span class="+ topic/keyword pr-d/parmname keyword parmname">//#undef
|
||
CLOCK_ALLOW_WRITE_DEBUGFS</span>。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d207127e196__20250123155223">修改源码后重新编译内核，<span class="+ topic/keyword pr-d/parmname keyword parmname">clk_rate</span> 结点的属性即变为可读写。</li>
|
||
<li class="- topic/li li" data-ofbid="d207127e202__20250123155223">通过以下命令，设置模块的时钟频率：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_jq3_rn3_pzb__codeblock_u52_qht_q1c" data-ofbid="concept_jq3_rn3_pzb__codeblock_u52_qht_q1c"><code>echo target-frequency > clk_rate</code></pre></li>
|
||
</ol></div></li>
|
||
</ol></li>
|
||
</ol></div>
|
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