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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-mmc.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">MMC 加载</h1><div class="date inPage">4 Dec 2024</div><div style="color: gray;">
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Read time: 3 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d274037e22__20250121171746">SPL 从 MMC 加载 U-Boot 的处理过程。程序编码的时候，针对 MMC 设备添加了对应的加载程序支持，如 <span class="+ topic/ph sw-d/filepath ph filepath">spl_mmc.c</span>
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中，通过使用宏 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">SPL_LOAD_IMAGE_METHOD(“MMC1”, 0, BOOT_DEVICE_MMC1,
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spl_mmc_load_image);</span></p><p class="- topic/p p" data-ofbid="d274037e29__20250121171746">将 <span class="+ topic/keyword pr-d/apiname keyword apiname">spl_mmc_load_image</span> 函数添加到 .u_boot_list_2_spl_image_loader_* 段。</p><div class="- topic/p p" data-ofbid="d274037e34__20250121171746">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> 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="mmc__codeblock_jxb_ftl_q1c" data-ofbid="mmc__codeblock_jxb_ftl_q1c">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><p class="- topic/p p" data-ofbid="d274037e41__20250121171746">找到 SPL MMC Loader 之后，从项目配置的指定 Sector 读取数据。</p><p class="- topic/p p" data-ofbid="d274037e43__20250121171746">CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR</p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="mmc__codeblock_rmy_3tl_q1c" data-ofbid="mmc__codeblock_rmy_3tl_q1c">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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|
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|-> spl_load_image(loader);
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|-> loader->load_image(spl_image, &bootdev);
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spl_mmc_load_image(); <em class="hl-comment">// common/spl/spl_mmc.c</em>
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|-> spl_mmc_load();
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+-------------+
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spl_mmc_load();
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|-> spl_mmc_find_device(&mmc, bootdev->boot_device);
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| |-> mmc_initialize
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| |-> mmc_probe
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| |-> uclass_get(UCLASS_MMC, &uc)
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| |-> device_probe(dev)
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| |-> uclass_resolve_seq(dev)
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| |-> pinctrl_select_state(dev, <span class="hl-string">"default"</span>)
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| | |-> pinctrl_select_state_full(dev, <span class="hl-string">"default"</span>)
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| | | |-> state = dev_read_stringlist_search(dev,
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| | | | <span class="hl-string">"pinctrl-names"</span>, <span class="hl-string">"default"</span>);
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| | | |-> dev_read_prop(dev, propname, &size)
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| | | | <em class="hl-comment">// snprintf(propname, sizeof(propname),</em>
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| | | | <em class="hl-comment">// "pinctrl-%d", state)</em>
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| | | |
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| | | |-> pinctrl_config_one(config)
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| | | |-> ops = pinctrl_get_ops(pctldev)
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| | | |-> ops->set_state(pctldev, config)
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| | |
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| | |-> pinctrl_select_state_simple(dev)
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| | |-> uclass_get_device_by_seq(UCLASS_PINCTRL, <span class="hl-number">0</span>, &pctldev)
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| | |-> ops=pinctrl_get_ops(pctldev)
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| | | <em class="hl-comment">// #define pinctrl_get_ops(dev)</em>
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| | | <em class="hl-comment">// ((struct pinctrl_ops *)(dev)->driver->ops)</em>
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| | |
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| | |-> ops->set_state_simple(pctldev, dev)
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| |
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| |-> power_domain_on(&powerdomain)
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| |-> uclass_pre_probe_device(dev)
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| |-> clk_set_defaults(dev)
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| | |-> clk_set_default_parents(dev)
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| | |-> clk_set_default_rates(dev)
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| |
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| |-> drv->probe(dev)
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| |-> uclass_post_probe_device(dev)
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|-> mmc_init
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|-> boot_mode=spl_boot_mode(bootdev->boot_device)
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|-> mmc_load_image_raw_sector
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|-> header=spl_get_load_buffer(-<strong class="hl-keyword">sizeof</strong>(*header), bd->blksz)
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| <em class="hl-comment">// header 位于 addr 偏移-head_size 处</em>
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|-> blk_dread(bd, sector, <span class="hl-number">1</span>, header)
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| <em class="hl-comment">// 读取一个 sector 的 u-boot image header</em>
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|-> mmc_load_legacy(spl_image, mmc, sector, header)
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| |-> spl_parse_image_header(spl_image, header)
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| <em class="hl-comment">// 解析 header 信息，得到 boot 的 addr 和 size 信息</em>
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|-> blk_dread(bd, sector, cnt, load_addr)
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<em class="hl-comment">// 读取完整的 image，包括 header，注意 addr 是向前偏移过的地址</em></pre></div></article></main></div>
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