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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/back-to-brom.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">返回 BROM</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 class="- topic/body concept/conbody body conbody">
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<p class="- topic/p p" data-ofbid="d194569e33__20250123155221">在 USB 升级的应用中，主机通过 USB 下载 SPL 到 SRAM，并且由 BROM 跳转执行，SPL 代码对 DDR 初始化结束之后需要返回到 BROM
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中继续执行下载其他数据的操作。</p>
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<p class="- topic/p p" data-ofbid="d194569e36__20250123155221">这种应用场景中，将返回 BROM 看做是从 BROM 中加载数据，因此返回 BROM 被实现为一个程序加载器。</p>
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<p class="- topic/p p" data-ofbid="d194569e39__20250123155221"><span class="+ topic/ph sw-d/filepath ph filepath">common/spl/spl_bootrom.c</span> 中通过注册 BOOT_DEVICE_BOOTROM 来实现。</p>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="back_to_brom__codeblock_sb1_vlr_c1c" data-ofbid="back_to_brom__codeblock_sb1_vlr_c1c"><code>SPL_LOAD_IMAGE_METHOD(<span class="hl-string">"BOOTROM"</span>, <span class="hl-number">0</span>, BOOT_DEVICE_BOOTROM, spl_return_to_bootrom);</code></pre>
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<div class="- topic/p p" data-ofbid="d194569e47__20250123155221">具体返回的函数是 <span class="+ topic/keyword pr-d/apiname keyword apiname">board_return_to_bootrom()</span>
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。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="back_to_brom__codeblock_vbs_ylr_c1c" data-ofbid="back_to_brom__codeblock_vbs_ylr_c1c"><code>board_init_r() <em class="hl-comment">// common/spl/spl.c</em>
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|-> board_boot_order()
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| |-> spl_boot_device(); <em class="hl-comment">// arch/arm/mach-artinchip/spl.c</em>
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| |-> aic_get_boot_device(); <em class="hl-comment">// arch/arm/mach-artinchip/boot_param.c</em>
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| <em class="hl-comment">// 从 boot param 中获取启动介质信息，</em>
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| <em class="hl-comment">// 此处返回 BD_BOOTROM</em>
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|
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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">// 此处找到的是 BOOT_DEVICE_BOOTROM</em>
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|
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|-> spl_return_to_bootrom();<em class="hl-comment">// common/spl/spl_bootrom.c</em>
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|-> board_return_to_bootrom();
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<em class="hl-comment">// arch/arm/mach-artinchip/lowlevel_init.S</em></code></pre></div>
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<p class="- topic/p p" data-ofbid="d194569e56__20250123155221"><a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="uboot-parameter.html">启动参数</a>描述了 BROM 跳转 SPL 运行时所传递的参数，SPL 在开始运行时已经保存了 BROM
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跳转时的所有重要寄存器，因此在 <span class="+ topic/keyword pr-d/apiname keyword apiname">board_return_to_bootrom()</span> 可以通过恢复现场，实现返回。</p>
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