https://calee0219.github.io/tag/kernel/KernelHugoBlox Kit (https://hugoblox.com)en-us©Sun, 26 Jul 2020 22:44:04 +0800https://calee0219.github.io/media/icon_hu_da05098ef60dc2e7.pnghttps://calee0219.github.io/tag/kernel/https://calee0219.github.io/blog/rpi_build_kernel/Sun, 26 Jul 2020 22:44:04 +0800https://calee0219.github.io/blog/rpi_build_kernel/<p>軟硬體</p> <ul> <li>HW: Raspberry Pi 4 4G</li> <li>SD Card: SanDisk Extreme PRO 64GB</li> <li>OS: Ubuntu Server 18.04</li> <li>Default kernel: 5.3.0-1017-raspi2</li> </ul> <h2 id="燒-os">燒 OS</h2> <p>先把 Ubuntu Server 18.04 燒進 SD Card，因為我們使用原生方式編譯，而不是 cross compile 後再把 image 燒進 SD Card</p> <p>這種好處是可以讓系統自己抓硬體參數，不過壞處可能是比你的 Server CPU 編譯速度慢很多</p> <h2 id="下載-source-與安裝-build-tools">下載 Source 與安裝 build tools</h2> <p>因為使用 Ubuntu 18.04 是 bionic，因此需要抓 bionic 的 source</p> <div class="highlight"><pre tabindex="0" class="chroma"><code class="language-bash" data-lang="bash"><span class="line"><span class="cl">sudo apt install git libncurses-dev flex bison openssl libssl-dev dkms libelf-dev libudev-dev libpci-dev libiberty-dev autoconf debhelper </span></span><span class="line"><span class="cl">git clone git git://kernel.ubuntu.com/ubuntu/ubuntu-bionic.git </span></span></code></pre></div><h2 id="設定編譯參數">設定編譯參數</h2> <p>在 editconf 實惠需要設定編譯參數，因為我們只有需要使用 arm64 (RPI 4 用 arm8 是 arm64)，因此前面的設定都可以 n 跳過，到 arm64 時再 Y 修改，當然如果你沒有東西要改也可以 n pass 掉，我自己有嘗試改過，但改完後就 check failed，所以最後選擇不改</p> <div class="highlight"><pre tabindex="0" class="chroma"><code class="language-bash" data-lang="bash"><span class="line"><span class="cl"><span class="nb">cd</span> ubuntu-bionic </span></span><span class="line"><span class="cl">chmod a+x debian/rules </span></span><span class="line"><span class="cl">chmod a+x debian/scripts/* </span></span><span class="line"><span class="cl">chmod a+x debian/scripts/misc/* </span></span><span class="line"><span class="cl"><span class="nv">LANG</span><span class="o">=</span>C fakeroot debian/rules clean </span></span><span class="line"><span class="cl"><span class="nv">LANG</span><span class="o">=</span>C fakeroot debian/rules editconfigs </span></span></code></pre></div><h2 id="編譯">編譯</h2> <div class="highlight"><pre tabindex="0" class="chroma"><code class="language-bash" data-lang="bash"><span class="line"><span class="cl"><span class="nv">LANG</span><span class="o">=</span>C fakeroot debian/rules clean </span></span><span class="line"><span class="cl"><span class="nv">LANG</span><span class="o">=</span>C fakeroot debian/rules binary-headers binary-generic binary-perarch </span></span></code></pre></div><p>如果你需要編除了 generic 外的 kernel，可以直接編譯全部</p> <div class="highlight"><pre tabindex="0" class="chroma"><code class="language-bash" data-lang="bash"><span class="line"><span class="cl"><span class="nv">LANG</span><span class="o">=</span>C fakeroot debian/rules binary </span></span></code></pre></div><p>此時就會需要很編譯久，也可以考慮用比較快的 x86 CPU 做 cross compile，此種方法比較麻煩的是你需要知道每個需要的參數再喂進去，而直接在要跑的硬體上面編譯的好處就是可以讓系統自己抓參數</p>