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role="button" tabindex="0" aria-labelledby="button-expand-action concept_mtx_tk3_pzb-d4445e3028-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/linux/chapter_linux.html" id="concept_mtx_tk3_pzb-d4445e3028-link">Linux</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-system-d4445e3198" class="topicref" data-id="chapter-system" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-system-d4445e3198-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-system.html" id="chapter-system-d4445e3198-link">系统</a><div class="wh-tooltip"><p class="shortdesc"></p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-memory-d4445e4054" class="topicref" data-id="chapter-memory" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-memory-d4445e4054-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-memory-sdk.html" id="chapter-memory-d4445e4054-link">存储</a><div class="wh-tooltip"><p class="shortdesc">SDMC、SPI NAND、SPI NOR 等存储模块的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="concept_mcc_32s_nbc-d4445e4438" class="topicref" data-id="concept_mcc_32s_nbc" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action concept_mcc_32s_nbc-d4445e4438-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-multi-media-sdk.html" id="concept_mcc_32s_nbc-d4445e4438-link">多媒体</a><div class="wh-tooltip"><p class="shortdesc">GE、VE、Display、DVP、MPP、MPP 播放器等多媒体模块的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="concept_nww_hzh_pzb-d4445e5947" class="topicref" data-id="concept_nww_hzh_pzb" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action concept_nww_hzh_pzb-d4445e5947-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-interface-sdk.html" id="concept_nww_hzh_pzb-d4445e5947-link">接口</a><div class="wh-tooltip"><p class="shortdesc">CAN、CIR、GPAI、GPIO、I2C、PSADC、PWM 等接口模块的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-safety-d4445e7944" class="topicref" data-id="chapter-safety" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-safety-d4445e7944-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-safety-sdk.html" id="chapter-safety-d4445e7944-link">安全</a><div class="wh-tooltip"><p class="shortdesc">SPI ENC、CE、eFuse 等安全模块的介绍和使用说明。</p></div></div></div></li></ul></li></ul></div>
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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/boot/load-spiNor.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">SPI NOR 加载</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>
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<div class="- topic/body concept/conbody body conbody">
|
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<p class="- topic/p p" data-ofbid="d55920e33__20250123155202"><span class="+ topic/ph sw-d/filepath ph filepath">common/spl/spl_spi.c</span> 中通过宏注册了 SPI NOR 的程序加载器。</p>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_dhz_pj3_pzb__pre_mjf_v1h_bzb" data-ofbid="concept_dhz_pj3_pzb__pre_mjf_v1h_bzb"><code>SPL_LOAD_IMAGE_METHOD(<span class="hl-string">"SPI"</span>,<span class="hl-number">1</span>,BOOT_DEVICE_SPI,spl_spi_load_image);</code></pre>
|
||
<ol class="- topic/ol ol" id="concept_dhz_pj3_pzb__ul_vw4_bcx_5dc" data-ofbid="concept_dhz_pj3_pzb__ul_vw4_bcx_5dc">
|
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<li class="- topic/li li" data-ofbid="d55920e43__20250123155202">
|
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<div class="- topic/p p" data-ofbid="d55920e45__20250123155202">在 SPL 初始化过程中，通过 <span class="+ topic/keyword pr-d/apiname keyword apiname">boot_from_devices(spl_boot_list)</span>
|
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函数调用，检查当前项目所支持的 SPL
|
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读取的存储介质类型，然后依次检查是否存在对应的程序加载器。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_dhz_pj3_pzb__codeblock_szf_jsy_c1c" data-ofbid="concept_dhz_pj3_pzb__codeblock_szf_jsy_c1c"><code>board_init_r() <em class="hl-comment">// common/spl/spl.c</em>
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|-> boot_from_devices(spl_boot_list)
|
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|-> spl_ll_find_loader() <em class="hl-comment">// 根据 device 找到 spl_load_image 指针</em>
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<em class="hl-comment">// 这里可能是各种介质的 load image 函数</em>
|
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<em class="hl-comment">// SPL_LOAD_IMAGE_METHOD() 定义的 Loader</em>
|
||
<em class="hl-comment">// 可能是 MMC/SPI/BROM/...</em></code></pre></div>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d55920e54__20250123155202">
|
||
<p class="- topic/p p" data-ofbid="d55920e56__20250123155202">找到 SPL SPI NOR Loader 之后，从项目配置的指定位置读取数据。</p>
|
||
<div class="- topic/p p" data-ofbid="d55920e59__20250123155202">SPI NOR 加载器需要编译时配置所用的 SPI 信息：<ul class="- topic/ul ul" id="concept_dhz_pj3_pzb__ul_ojf_v1h_bzb" data-ofbid="concept_dhz_pj3_pzb__ul_ojf_v1h_bzb">
|
||
<li class="- topic/li li" data-ofbid="d55920e63__20250123155202">
|
||
<p class="- topic/p p" data-ofbid="d55920e65__20250123155202">CONFIG_SF_DEFAULT_BUS</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d55920e69__20250123155202">
|
||
<p class="- topic/p p" data-ofbid="d55920e71__20250123155202">CONFIG_SF_DEFAULT_CS</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d55920e75__20250123155202">
|
||
<p class="- topic/p p" data-ofbid="d55920e77__20250123155202">CONFIG_SF_DEFAULT_SPEED</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d55920e81__20250123155202">
|
||
<p class="- topic/p p" data-ofbid="d55920e83__20250123155202">CONFIG_SF_DEFAULT_MODE</p>
|
||
</li>
|
||
</ul></div>
|
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</li>
|
||
<li class="- topic/li li" data-ofbid="d55920e89__20250123155202">
|
||
<p class="- topic/p p" data-ofbid="d55920e91__20250123155202">通过下面的配置指定读取数据的位置：</p>
|
||
<div class="- topic/p p" data-ofbid="d55920e94__20250123155202">CONFIG_SYS_SPI_U_BOOT_OFFS：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_dhz_pj3_pzb__codeblock_fzy_jsy_c1c" data-ofbid="concept_dhz_pj3_pzb__codeblock_fzy_jsy_c1c"><code>boot_from_devices(spl_boot_list); <em class="hl-comment">// common/spl/spl.c</em>
|
||
|-> spl_ll_find_loader() <em class="hl-comment">// 根据 device 找到 spl_load_image 指针</em>
|
||
| <em class="hl-comment">// 此处通过遍历固件的 .u_boot_list_2_spl_image_loader_* 段</em>
|
||
| <em class="hl-comment">// 找到当前支持的存储介质，然后逐个尝试</em>
|
||
|
|
||
|-> spl_load_image(loader);
|
||
|-> loader->load_image(spl_image, &bootdev);
|
||
spl_spi_load_image(); <em class="hl-comment">// common/spl/spl_spi.c</em>
|
||
|-> spi_flash_probe();
|
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|-> spl_get_load_buffer(-<strong class="hl-keyword">sizeof</strong>(*header), <strong class="hl-keyword">sizeof</strong>(*header));
|
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|-> spi_flash_read(header);
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|-> spl_parse_image_header();
|
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|-> spi_flash_read();
|
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|-> spi_flash_read_dm(flash->dev, offset, len, buf);
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|-> sf_get_ops(dev)->read(dev, offset, len, buf);
|
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spi_flash_std_read(dev, offset, len, buf);
|
||
| <em class="hl-comment">// drivers/mtd/spi/sf_probe.c</em>
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||
|-> mtd->_read(mtd, offset, len, &retlen, buf);
|
||
spi_flash_mtd_read(mtd, offset, len, &retlen, buf);
|
||
<em class="hl-comment">// drivers/mtd/spi/sf_mtd.c</em></code></pre></div>
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