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class="post-meta-item-text">字数统计:</span> <span class="post-count">234字</span> </span></span><span class="post-time"> | <span class="post-meta-item-icon"><i class="icon-book icon"></i> <span class="post-meta-item-text">阅读时长≈</span> <span class="post-count">1分</span></span></span></div></header><div class="article-entry" itemprop="articleBody"><p><strong>IMX6ULL裸机开发学习</strong></p><p>以下内容是我在学习正点原子<code>IMX6ULL</code>开发板<code>alpha</code>中记录的笔记，部分摘录自正点原子<code>IMX6ULL开发手册</code>。</p><h2 id="链接脚本"><a href="#链接脚本" class="headerlink" title="链接脚本"></a>链接脚本</h2><p>链接脚本的例子</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line">SECTIONS</span><br><span class="line">{</span><br><span class="line"> . = 0X87800000;</span><br><span class="line"> .text :</span><br><span class="line"> {</span><br><span class="line"> start.o</span><br><span class="line"> main.o</span><br><span class="line"> *(.text)</span><br><span class="line"> }</span><br><span class="line"> .rodata ALIGN(4) : {*(.rodata)}</span><br><span class="line"> .data ALIGN(4) : {*(.data)}</span><br><span class="line"> __bss_start = .;</span><br><span class="line"> .bss ALIGN(4) : {*(.bss) *(.COMMON)}</span><br><span class="line"> __bss_end = .;</span><br><span class="line">}</span><br></pre></td></tr></table></figure><a id="more"></a><h2 id="加上清除BSS段，代码不运行"><a href="#加上清除BSS段，代码不运行" class="headerlink" title="加上清除BSS段，代码不运行"></a>加上清除BSS段，代码不运行</h2><p>__bss_start = 0X87800289 。对于32位的SOC来说，一般访问是4字节访问的。0X0，0X4，0X8，0XC。芯片处理的时候以4字节访问，因此会从0X87800288开始清除BSS段。然而0X87800288不属于BSS段。所以我们需要对__bss_start进行四字节对齐。按照四字节对齐的原理，__bss_start = 0X8780028C。所以需要设置__bss_start为四字节对齐。</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line">SECTIONS </span><br><span class="line">{</span><br><span class="line"> . = 0x87800000;</span><br><span class="line"> .text : </span><br><span class="line"> {</span><br><span class="line"> obj/start.o;</span><br><span class="line"> *(.text);</span><br><span class="line"> }</span><br><span class="line"> .rodata ALIGN(4) : {*(.rodata)}</span><br><span class="line"> .data ALIGN(4) : {*(.data)}</span><br><span class="line"> . = ALIGN(4);</span><br><span class="line"> __bss_start = .;</span><br><span class="line"> .bss ALIGN(4) : {*(.bss) *(COMMON)}</span><br><span class="line"> __bss_end = .;</span><br><span class="line">}</span><br></pre></td></tr></table></figure><div class="declare"><ul class="post-copyright"><li><strong>本文作者：</strong> 路痴的兔子</li><li><strong>本文链接：</strong> <a href="https:/proudrabbit.gitee.io/IMX6ULL学习笔记-三.html" title="IMX6ULL学习笔记(三)" target="_blank">https:/proudrabbit.gitee.io/IMX6ULL学习笔记-三.html</a></li><li><strong>版权声明： </strong>本博客所有文章除特别声明外，均采用 <a href="https://github.com/JoeyBling/hexo-theme-yilia-plus/blob/master/LICENSE" rel="external nofollow" target="_blank">MIT</a> 许可协议。转载请注明出处！</li></ul></div></div><div class="article-info article-info-index"><div class="article-tag tagcloud"><i class="icon-price-tags icon"></i><ul class="article-tag-list"><li class="article-tag-list-item"><a href="javascript:void(0)" class="js-tag article-tag-list-link color4">嵌入式</a></li><li class="article-tag-list-item"><a href="javascript:void(0)" class="js-tag article-tag-list-link color3">IMX6ULL</a></li><li class="article-tag-list-item"><a href="javascript:void(0)" class="js-tag article-tag-list-link color5">学习笔记</a></li></ul></div><div class="share-btn share-icons tooltip-left"><div class="tooltip tooltip-east"><span class="tooltip-item"><a href="javascript:;" class="share-sns share-outer"><i class="icon icon-share"></i> </a></span><span class="tooltip-content"><div class="share-wrap"><div class="share-icons"><a class="weibo share-sns" href="javascript:;" data-type="weibo"><i class="icon icon-weibo"></i> </a><a class="weixin share-sns wxFab" href="javascript:;" data-type="weixin"><i class="icon icon-weixin"></i> </a><a class="qq share-sns" href="javascript:;" 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class="clearfix"></div></div></div></article><nav id="article-nav"><a href="/IMX6ULL%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0-%E5%9B%9B.html" id="article-nav-newer" class="article-nav-link-wrap"><i class="icon-circle-left"></i><div class="article-nav-title">IMX6ULL学习笔记(四)</div></a><a href="/IMX6ULL%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0-%E4%BA%8C.html" id="article-nav-older" class="article-nav-link-wrap"><div class="article-nav-title">IMX6ULL学习笔记(二)</div><i class="icon-circle-right"></i></a></nav><aside class="wrap-side-operation"><div class="mod-side-operation"><div class="jump-container" id="js-jump-container" style="display:none"><a href="javascript:void(0)" class="mod-side-operation__jump-to-top"><i class="icon-font icon-back"></i></a><div id="js-jump-plan-container" class="jump-plan-container" style="top:-11px"><i class="icon-font icon-plane jump-plane"></i></div></div><div class="toc-container tooltip-left"><i class="icon-font icon-category"></i><div class="tooltip tooltip-east"><span 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jsonContent:
meta: false
pages: false
posts:
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raw: false
content: false
slug: false
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comments: false
link: false
permalink: false
excerpt: false
categories: false
tags: true
</pre></p><li class="search-li" q-repeat="items" q-show="isShow"><a q-attr="href:path|urlformat" class="search-title"><i class="icon-quo-left icon"></i><span q-text="title"></span></a><p class="search-time"><i class="icon-calendar icon"></i> <span q-text="date|dateformat"></span></p><p class="search-tag"><i class="icon-price-tags icon"></i> <span q-repeat="tags" q-on="click:choseTag(e, name)" q-text="name|tagformat"></span></p></li></ul></section><section class="tools-section tools-section-friends" q-show="friends"><ul class="search-ul"><li class="search-li"><a href="https://blog.csdn.net/qq_37000789" target="_blank" class="search-title" title="个人博客"><i class="icon-link icon"></i> 正月点灯笼的博客</a></li><li class="search-li"><a href="https://blog.csdn.net/ld1461575230?spm=1001.2101.3001.5343&type=blog" target="_blank" class="search-title" title="个人博客"><i class="icon-link icon"></i> 哈哈哈的嘎嘎嘎的博客</a></li><li class="search-li"><a href="https://gujiakai.gitee.io/" target="_blank" class="search-title" title="个人博客"><i class="icon-link icon"></i> 摸鱼的小灰栗的博客</a></li></ul></section><section class="tools-section tools-section-me" q-show="aboutme"><div class="aboutme-wrap" id="aboutme">熟悉的技术：<br>C/C++、Python、嵌入式、ROS。<br>开源爱好者、Linux爱好者。<br>欢迎访问我的博客。hi✿(。◕ᴗ◕。)✿</div></section></div></div><div class="pswp" tabindex="-1" role="dialog" aria-hidden="true"><div class="pswp__bg"></div><div class="pswp__scroll-wrap"><div class="pswp__container"><div class="pswp__item"></div><div class="pswp__item"></div><div class="pswp__item"></div></div><div class="pswp__ui pswp__ui--hidden"><div class="pswp__top-bar"><div class="pswp__counter"></div><button class="pswp__button pswp__button--close" title="Close (Esc)"></button> <button class="pswp__button pswp__button--share" style="display:none" title="Share"></button> <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button> <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button><div class="pswp__preloader"><div class="pswp__preloader__icn"><div class="pswp__preloader__cut"><div class="pswp__preloader__donut"></div></div></div></div></div><div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap"><div class="pswp__share-tooltip"></div></div><button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)"></button> <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)"></button><div class="pswp__caption"><div class="pswp__caption__center"></div></div></div></div></div></div><script type="text/javascript" src="/plugins/TweenMax/TweenMax.min.js"></script><script type="text/javascript" src="/plugins/TweenMax/HoverImg.js"></script><script>var hoverEffect = {
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