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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/d13x_bare_boot/brom-load-limit-and-notes.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">Boot ROM 直接加载的限制与注意事项</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;"></div><div class="- topic/body concept/conbody body conbody"><p class="- topic/shortdesc shortdesc"></p><ol class="- topic/ol ol" id="brom-load-limit-and-notes__ol_mjv_r2r_gdc" data-ofbid="brom-load-limit-and-notes__ol_mjv_r2r_gdc"><li class="- topic/li li" data-ofbid="d182343e21__20250121171625">
<p class="- topic/p p" data-ofbid="d182343e23__20250121171625">启动速度</p>
<p class="- topic/p p" data-ofbid="d182343e26__20250121171625">Boot ROM 运行时:</p>
<ul class="- topic/ul ul" id="brom-load-limit-and-notes__ul_pjv_r2r_gdc" data-ofbid="brom-load-limit-and-notes__ul_pjv_r2r_gdc"><li class="- topic/li li" data-ofbid="d182343e30__20250121171625">
<p class="- topic/p p" data-ofbid="d182343e32__20250121171625">CPU 仅跑在 24 MHz</p>
</li><li class="- topic/li li" data-ofbid="d182343e35__20250121171625">
<p class="- topic/p p" data-ofbid="d182343e37__20250121171625">没有使能 Cache</p>
</li><li class="- topic/li li" data-ofbid="d182343e40__20250121171625">
<p class="- topic/p p" data-ofbid="d182343e42__20250121171625">没有使能中断</p>
</li></ul>
<p class="- topic/p p" data-ofbid="d182343e46__20250121171625">因此如果 APP 较大,可能出现加载速度较慢的情况。</p>
</li><li class="- topic/li li" data-ofbid="d182343e49__20250121171625">
<p class="- topic/p p" data-ofbid="d182343e51__20250121171625">SPINAND/eMMC 加载的镜像大小</p>
<ul class="- topic/ul ul" id="brom-load-limit-and-notes__ul_jcl_s2r_gdc" data-ofbid="brom-load-limit-and-notes__ul_jcl_s2r_gdc"><li class="- topic/li li" data-ofbid="d182343e55__20250121171625">SPINANDAPP 不能超过 2 个物理块的大小,如果超过,则应该使用 BootLoader</li><li class="- topic/li li" data-ofbid="d182343e57__20250121171625">eMMC APP 不能超过 512K Byte如果超过则应该使用 BootLoader</li></ul>
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