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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/spinor/spinor_config.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">SPI NOR 配置</h1><div class="date inPage">27 Nov 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="spi_nor_configuration__section_s5t_g5y_c1c" data-ofbid="spi_nor_configuration__section_s5t_g5y_c1c"><h2 class="- topic/title title sectiontitle">修改 DTS</h2>
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<div class="- topic/p p" data-ofbid="d177583e28__20250121171623">要在实际项目中使用 SPI NOR 设备，还需要修改 DTS 配置，详细流程如下所示：<ol class="- topic/ol ol" id="spi_nor_configuration__ul_vmr_zgc_ndc" data-ofbid="spi_nor_configuration__ul_vmr_zgc_ndc"><li class="- topic/li li" data-ofbid="d177583e31__20250121171623">
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<div class="- topic/p p" data-ofbid="d177583e33__20250121171623">在 <span class="+ topic/ph sw-d/filepath ph filepath">board.dts</span> 中具体的 SPI 控制器下添加
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<code class="+ topic/ph pr-d/codeph ph codeph">jedec,spi-nor</code>
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设备。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="spi_nor_configuration__pre_t5t_g5y_c1c" data-ofbid="spi_nor_configuration__pre_t5t_g5y_c1c">&spi0 {
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pinctrl-names = <span class="hl-string">"default"</span>;
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pinctrl-<span class="hl-number">0</span> = <&spi0_pins_a>;
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status = <span class="hl-string">"okay"</span>;
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spi-max-frequency = <<span class="hl-number">100000000</span>>;
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spi-flash@<span class="hl-number">0</span> {
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#address-cells = <<span class="hl-number">1</span>>;
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#size-cells = <<span class="hl-number">1</span>>;
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compatible = <span class="hl-string">"jedec,spi-nor"</span>; <em class="hl-comment">//固定值，所有基于 dts 的 SPI NOR 均声明此</em>
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spi-max-frequency = <<span class="hl-number">100000000</span>>; <em class="hl-comment">//最大频率，固定值</em>
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spi-tx-bus-width = <<span class="hl-number">4</span>>;
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spi-rx-bus-width = <<span class="hl-number">4</span>>;
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reg = <<span class="hl-number">0</span>>; <em class="hl-comment">//固定值，一般不需修改</em>
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status = <span class="hl-string">"okay"</span>;
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};
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};
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</pre></div>
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</li><li class="- topic/li li" data-ofbid="d177583e44__20250121171623">
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<div class="- topic/p p" data-ofbid="d177583e46__20250121171623">在 <span class="+ topic/ph sw-d/filepath ph filepath">board-u-boot.dtsi</span> 文件中，将
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<code class="+ topic/ph pr-d/codeph ph codeph">jedec,spi-nor</code> 设备标记为
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<code class="+ topic/ph pr-d/codeph ph codeph">u-boot,dm-pre-reloc</code>，确保 SPL
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无法识别和使用。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="spi_nor_configuration__pre_u5t_g5y_c1c" data-ofbid="spi_nor_configuration__pre_u5t_g5y_c1c">&spi0 {
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u-boot,dm-pre-reloc;
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spi-flash@<span class="hl-number">0</span> {
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u-boot,dm-pre-reloc;
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};
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};
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</pre></div>
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</li></ol></div>
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</section><section class="- topic/section section" id="spi_nor_configuration__section_zbw_cqy_c1c" data-ofbid="spi_nor_configuration__section_zbw_cqy_c1c"><h2 class="- topic/title title sectiontitle">配置 Bus Width</h2>
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<div class="- topic/p p" data-ofbid="d177583e66__20250121171623">根据 SPI NOR 芯片的总线宽度，正确设置 <code class="+ topic/ph pr-d/codeph ph codeph">spi-tx-bus-width</code>：<ul class="- topic/ul ul" id="spi_nor_configuration__ul_j44_3hc_ndc" data-ofbid="spi_nor_configuration__ul_j44_3hc_ndc"><li class="- topic/li li" data-ofbid="d177583e72__20250121171623">
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<p class="- topic/p p" data-ofbid="d177583e74__20250121171623">标准 SPI NOR 配置为 1</p>
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</li><li class="- topic/li li" data-ofbid="d177583e77__20250121171623">
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<p class="- topic/p p" data-ofbid="d177583e79__20250121171623">Dual SPI NOR 配置为 2</p>
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</li><li class="- topic/li li" data-ofbid="d177583e82__20250121171623">
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<p class="- topic/p p" data-ofbid="d177583e84__20250121171623">Quad SPI NOR 配置为 4</p>
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</li></ul></div>
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<div class="- topic/note note note note_note" id="spi_nor_configuration__note_xrf_jhb_ndc" data-ofbid="spi_nor_configuration__note_xrf_jhb_ndc"><span class="note__title">注：</span> 窄总线设备无法在宽总线模式下工作。</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="#spi_nor_configuration__section_s5t_g5y_c1c" data-tocid="spi_nor_configuration__section_s5t_g5y_c1c">修改 DTS</a></div></li><li class="section-item"><div class="section-title"><a href="#spi_nor_configuration__section_zbw_cqy_c1c" data-tocid="spi_nor_configuration__section_zbw_cqy_c1c">配置 Bus Width</a></div></li></ul></div>
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