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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/cmu/cmu-debug-guide-lb.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">调试指南</h1><div class="date inPage">4 Dec 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><div class="- topic/p p" data-ofbid="d348416e22__20250121172123">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"><li class="- topic/li li" data-ofbid="d348416e25__20250121172123">确保打开 <span class="+ topic/keyword pr-d/parmname keyword parmname">Debugfs</span>。SDK 中默认已打开
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<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">Kernel hacking--->
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Generic Kernel Debugging Instruments--->
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Debug Filesystem
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Debugfs <strong class="hl-keyword">default</strong> access(Access normal)---></pre><p class="- topic/p p" data-ofbid="d348416e35__20250121172123">内核的 CCF
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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="d348416e40__20250121172123">保存配置并重新编译内核。</li><li class="- topic/li li" data-ofbid="d348416e42__20250121172123">通过以下命令将 <span class="+ topic/keyword pr-d/parmname keyword parmname">Debugfs</span>
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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">mount -t debugfs none /sys/kernel/debug</pre><p class="- topic/p p" data-ofbid="d348416e52__20250121172123">内核启动后，<code class="+ topic/ph pr-d/codeph ph codeph">Debugfs</code>
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默认未挂载。</p></li><li class="- topic/li li" data-ofbid="d348416e57__20250121172123">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="d348416e60__20250121172123">打开 <span class="+ topic/keyword pr-d/parmname keyword parmname">Debugfs</span>
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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">cd /sys/kernel/debug/clk</pre><p class="- topic/p p" data-ofbid="d348416e67__20250121172123">该目录存储了内核中注册的所有时钟。使用
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<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="d348416e72__20250121172123">
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<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/>
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</div></li><li class="- topic/li li" data-ofbid="d348416e78__20250121172123">通过 summary
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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">cat clk_summary</pre><p class="- topic/p p" data-ofbid="d348416e82__20250121172123">Summary
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结点位于 <span class="+ topic/ph sw-d/filepath ph filepath">/sys/kernel/debug/clk</span>
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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="d348416e87__20250121172123">
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<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/>
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</div></li><li class="- topic/li li" data-ofbid="d348416e93__20250121172123">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="d348416e96__20250121172123">在 <span class="+ topic/ph sw-d/filepath ph filepath">/sys/kernel/debug/clk</span> 目录中，打开
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<span class="+ topic/ph sw-d/filepath ph filepath">uart0</span> 目录。<p class="- topic/p p" data-ofbid="d348416e104__20250121172123">在
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<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
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时钟的各个属性。</p><div class="- topic/p p" data-ofbid="d348416e109__20250121172123">
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<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/>
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</div></li><li class="- topic/li li" data-ofbid="d348416e115__20250121172123">
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<p class="- topic/p p" data-ofbid="d348416e117__20250121172123">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>
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<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"></pre>
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<div class="- topic/p p" data-ofbid="d348416e125__20250121172123">
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<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/>
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</div>
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</li></ol></li><li class="- topic/li li" data-ofbid="d348416e132__20250121172123">设置 <span class="+ topic/keyword pr-d/parmname keyword parmname">clk_rate</span>。<div class="- topic/p p" data-ofbid="d348416e137__20250121172123">默认情况下，<span class="+ topic/keyword pr-d/parmname keyword parmname">clk_rate</span>
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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>
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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="d348416e146__20250121172123">打开 menuconfig 中的下列配置，生成宏
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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">Kernel hacking--->
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ArtInChip Debug--->
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[*] CMU driver debug</pre><p class="- topic/p p" data-ofbid="d348416e150__20250121172123">在编译时，会根据该宏在
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gcc 的-D 选项参数后定义宏 DEBUGFS。</p></li><li class="- topic/li li" data-ofbid="d348416e152__20250121172123">
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<p class="- topic/p p" data-ofbid="d348416e154__20250121172123">在源码 <span class="+ topic/ph sw-d/filepath ph filepath">drivers/clk/clk.c</span> 文件中，注释
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<span class="+ topic/keyword pr-d/parmname keyword parmname">//#undef
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CLOCK_ALLOW_WRITE_DEBUGFS</span>。</p>
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</li><li class="- topic/li li" data-ofbid="d348416e163__20250121172123">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="d348416e168__20250121172123">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">echo target-frequency > clk_rate</pre></li></ol></div></li></ol></li></ol></div></div></article></main></div>
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