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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/uboot-parameters.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">启动参数的使用</h1><div class="date inPage">4 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="d168877e23__20250121171620">目前启动参数在下列情况下有应用：</p><ul class="- topic/ul ul" id="concept_hj4_tsl_tzb__ul_opc_wyg_bzb" data-ofbid="concept_hj4_tsl_tzb__ul_opc_wyg_bzb"><li class="- topic/li li" data-ofbid="d168877e26__20250121171620">
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<p class="- topic/p p" data-ofbid="d168877e28__20250121171620">加快启动速度</p>
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<p class="- topic/p p" data-ofbid="d168877e31__20250121171620">在正常启动的应用场景中，BROM 从 eFuse 中获取了当前的启动介质。在 eFuse 没有设置的情况下， BROM
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通过尝试的方式找到可启动的介质和镜像。SPL 和 U-Boot 运行时，可从启动参数中直接得到当前的启动设备信息，
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可以直接从该设备上进行加载固件数据，加快启动速度。</p>
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</li><li class="- topic/li li" data-ofbid="d168877e34__20250121171620">
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<p class="- topic/p p" data-ofbid="d168877e36__20250121171620">USB 升级</p>
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<p class="- topic/p p" data-ofbid="d168877e39__20250121171620">USB 升级从 BROM 开始，并且先后从主机下载 SPL 和 U-Boot 并且执行。在 USB 升级的情况下， BROM 跳转到 SPL 和 U-Boot
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时，都会将启动介质设置为 BD_BOOTROM。SPL 通过检查启动介质， 发现如果是 BD_BOOTROM，则只进行 DRAM 初始化，并且运行结束后返回
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BROM。U-Boot 通过检查启动介质， 发现如果是 BD_BOOTROM，则直接进入 U-Boot 的 USB 升级模式。</p>
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</li><li class="- topic/li li" data-ofbid="d168877e42__20250121171620">
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<p class="- topic/p p" data-ofbid="d168877e44__20250121171620">启动时间</p>
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<p class="- topic/p p" data-ofbid="d168877e47__20250121171620">通过传递的参数信息，可以准确的获知上一级引导程序所消耗的启动时间。这对启动时间优化调试有帮助。</p>
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</li><li class="- topic/li li" data-ofbid="d168877e50__20250121171620">
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<p class="- topic/p p" data-ofbid="d168877e52__20250121171620">返回 BROM</p>
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<p class="- topic/p p" data-ofbid="d168877e55__20250121171620">由于 <span class="+ topic/keyword pr-d/parmname keyword parmname">boot_params_stash</span> 中保存了 BROM 调用时的重要寄存器信息，可以从中恢复调用现场， 从而实现返回
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BROM 的功能。具体可参考 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="back-to-brom.html">返回 BROM</a>。</p>
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</li></ul></div></article></main></div>
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