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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/pre-boot-program.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">Pre-Boot Program (PBP)</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="d126046e22__20250121171601">Pre-Boot Program (PBP) 是 ArtInChip 芯片平台启动过程中的一段程序，在 BROM 程序跳转执行 SPL 之前， 运行的代码。 PBP
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程序用于初始化一些不开放的硬件模块，比如 DRAM 控制器的初始化。</p><section class="- topic/section section" id="pbp__section_iqh_3gh_bzb" data-ofbid="pbp__section_iqh_3gh_bzb"><h2 class="- topic/title title sectiontitle">存放位置</h2><p class="- topic/p p" data-ofbid="d126046e27__20250121171601">PBP 程序是以二进制形式保存在 SDK 中，通常位于
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<span class="+ topic/ph sw-d/filepath ph filepath">target/<var class="+ topic/keyword sw-d/varname keyword varname">chip</var>/common/<var class="+ topic/keyword sw-d/varname keyword varname">chipname</var>.pbp</span></p><p class="- topic/p p" data-ofbid="d126046e37__20250121171601">在
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<span class="+ topic/ph sw-d/filepath ph filepath">mk_image.py</span> 生成镜像文件的过程中，PBP 程序与 SPL 程序一起被打包到 AIC 启动镜像文件当中。
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具体配置可以查看对应项目的 <span class="+ topic/ph sw-d/filepath ph filepath">image_cfg.json</span> 文件。</p><div class="- topic/p p" data-ofbid="d126046e45__20250121171601"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="pbp__image_lqh_3gh_bzb" src="../../../images/boot/pbp_place_in_img.png"/></div><br/></div></section><section class="- topic/section section" id="pbp__section_mqh_3gh_bzb" data-ofbid="pbp__section_mqh_3gh_bzb"><h2 class="- topic/title title sectiontitle">何时运行</h2><p class="- topic/p p" data-ofbid="d126046e50__20250121171601">正常启动过程中，BROM 会检查 PBP
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程序是否存在，如果存在，则跳转执行 PBP 程序。PBP 程序执行完毕， 会返回到 BROM。BROM 则继续跳转执行 SPL 程序。</p><div class="- topic/p p" data-ofbid="d126046e52__20250121171601"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="pbp__image_nqh_3gh_bzb" src="../../../images/brom/brom_run_pbp.png"/></div><br/></div></section><section class="- topic/section section" id="pbp__section_oqh_3gh_bzb" data-ofbid="pbp__section_oqh_3gh_bzb"><h2 class="- topic/title title sectiontitle">参数配置</h2>
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<p class="- topic/p p" data-ofbid="d126046e59__20250121171601">不同项目，可能需要传递一些配置参数给 PBP 使用，可以通过 AIC 启动镜像的 <span class="+ topic/keyword pr-d/parmname keyword parmname">Private data area</span>
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保存这些参数。PBP 在被执行时可以得到该区域的地址和长度，然后自行解析数据，得到具体的参数。</p>
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<figure class="- topic/fig fig fignone" id="pbp__fig_vs1_lvr_c1c" data-ofbid="pbp__fig_vs1_lvr_c1c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="pbp__image_pqh_3gh_bzb" src="../../../images/boot/private_data_for_pbp.png"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">Private data 与 PBP 的保存位置</span></figcaption></figure>
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<p class="- topic/p p" data-ofbid="d126046e70__20250121171601">PBP 程序运行时，可以得到 <span class="+ topic/keyword pr-d/parmname keyword parmname">Private data area</span> 的地址。</p>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pbp__codeblock_qqh_3gh_bzb" data-ofbid="pbp__codeblock_qqh_3gh_bzb"><strong class="hl-keyword">void</strong> pbp_main(u32 boot_param, <strong class="hl-keyword">void</strong> *priv_addr, u32 priv_len)
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{
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...
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}</pre>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#pbp__section_iqh_3gh_bzb" data-tocid="pbp__section_iqh_3gh_bzb">存放位置</a></div></li><li class="section-item"><div class="section-title"><a href="#pbp__section_mqh_3gh_bzb" data-tocid="pbp__section_mqh_3gh_bzb">何时运行</a></div></li><li class="section-item"><div class="section-title"><a href="#pbp__section_oqh_3gh_bzb" data-tocid="pbp__section_oqh_3gh_bzb">参数配置</a></div></li></ul></div>
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