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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/dma/dma-faq.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">常见问题</h1><div class="date inPage">13 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"><section class="- topic/section section" id="concept_utl_nl3_pzb__section_hhh_h4s_c1c" data-ofbid="concept_utl_nl3_pzb__section_hhh_h4s_c1c"><h2 class="- topic/title title sectiontitle">dmatest 时 verify 数据报错</h2>
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<p class="- topic/p p" data-ofbid="d285987e27__20250121171754"><strong class="+ topic/ph hi-d/b ph b">现象</strong></p>
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<p class="- topic/p p" data-ofbid="d285987e31__20250121171754">当运行 dmatest 测试时，错误 log 类似如下：</p>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_utl_nl3_pzb__pre_f4l_vbm_hzb" data-ofbid="concept_utl_nl3_pzb__pre_f4l_vbm_hzb">[ <span class="hl-number">381.878419</span>] dmatest: dma0chan5-copy0: dstbuf[<span class="hl-number">0x3f70</span>] mismatch! Expected cf, got d7
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[ <span class="hl-number">381.885999</span>] dmatest: dma0chan5-copy0: dstbuf[<span class="hl-number">0x3f71</span>] mismatch! Expected ce, got d6
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[ <span class="hl-number">381.893611</span>] dmatest: dma0chan5-copy0: dstbuf[<span class="hl-number">0x3f72</span>] mismatch! Expected cd, got d5
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[ <span class="hl-number">381.901199</span>] dmatest: dma0chan5-copy0: dstbuf[<span class="hl-number">0x3f73</span>] mismatch! Expected cc, got d4
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[ <span class="hl-number">381.908783</span>] dmatest: dma0chan5-copy0: dstbuf[<span class="hl-number">0x3f74</span>] mismatch! Expected cb, got d3
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[ <span class="hl-number">381.916350</span>] dmatest: dma0chan5-copy0: dstbuf[<span class="hl-number">0x3f75</span>] mismatch! Expected ca, got d2
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</pre>
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<p class="- topic/p p" data-ofbid="d285987e37__20250121171754"><strong class="+ topic/ph hi-d/b ph b">原因分析</strong></p>
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<p class="- topic/p p" data-ofbid="d285987e42__20250121171754">dmatest 的默认配置是需要 verify 测试数据的。</p>
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<p class="- topic/p p" data-ofbid="d285987e45__20250121171754">当进行多通道（max_channels>1）测试时，必须要使能 polled 属性，以保证通道的测试过程是串行的，否则会报 verify 错误。</p>
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<p class="- topic/p p" data-ofbid="d285987e48__20250121171754">设置 polled 属性的方法见 <a class="- topic/xref xref" href="dma-test-guide.html#concept_bst_l43_pzb__section_umk_bcp_mdc">dmatest 测试</a>。</p>
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