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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/boot/load-spiNor.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">SPI NOR 加载</h1><div class="date inPage">25 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"><p class="- topic/p p" data-ofbid="d212341e22__20250121171640"><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">SPL_LOAD_IMAGE_METHOD(<span class="hl-string">"SPI"</span>,<span class="hl-number">1</span>,BOOT_DEVICE_SPI,spl_spi_load_image);</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"><li class="- topic/li li" data-ofbid="d212341e29__20250121171640">
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<div class="- topic/p p" data-ofbid="d212341e31__20250121171640">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">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>
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<em class="hl-comment">// 可能是 MMC/SPI/BROM/...</em></pre></div>
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</li><li class="- topic/li li" data-ofbid="d212341e39__20250121171640">
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<p class="- topic/p p" data-ofbid="d212341e41__20250121171640">找到 SPL SPI NOR Loader 之后，从项目配置的指定位置读取数据。</p>
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<div class="- topic/p p" data-ofbid="d212341e44__20250121171640">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="d212341e47__20250121171640">
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<p class="- topic/p p" data-ofbid="d212341e49__20250121171640">CONFIG_SF_DEFAULT_BUS</p>
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</li><li class="- topic/li li" data-ofbid="d212341e52__20250121171640">
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<p class="- topic/p p" data-ofbid="d212341e54__20250121171640">CONFIG_SF_DEFAULT_CS</p>
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</li><li class="- topic/li li" data-ofbid="d212341e57__20250121171640">
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<p class="- topic/p p" data-ofbid="d212341e59__20250121171640">CONFIG_SF_DEFAULT_SPEED</p>
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</li><li class="- topic/li li" data-ofbid="d212341e62__20250121171640">
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<p class="- topic/p p" data-ofbid="d212341e64__20250121171640">CONFIG_SF_DEFAULT_MODE</p>
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</li></ul></div>
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</li><li class="- topic/li li" data-ofbid="d212341e68__20250121171640">
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<p class="- topic/p p" data-ofbid="d212341e70__20250121171640">通过下面的配置指定读取数据的位置：</p>
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<div class="- topic/p p" data-ofbid="d212341e73__20250121171640">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">boot_from_devices(spl_boot_list); <em class="hl-comment">// common/spl/spl.c</em>
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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">// 此处通过遍历固件的 .u_boot_list_2_spl_image_loader_* 段</em>
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| <em class="hl-comment">// 找到当前支持的存储介质，然后逐个尝试</em>
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|-> spl_load_image(loader);
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|-> loader->load_image(spl_image, &bootdev);
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spl_spi_load_image(); <em class="hl-comment">// common/spl/spl_spi.c</em>
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|-> 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);
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| <em class="hl-comment">// drivers/mtd/spi/sf_probe.c</em>
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|-> mtd->_read(mtd, offset, len, &retlen, buf);
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spi_flash_mtd_read(mtd, offset, len, &retlen, buf);
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<em class="hl-comment">// drivers/mtd/spi/sf_mtd.c</em></pre></div>
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