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194 lines
7.3 KiB
194 lines
7.3 KiB
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<title>🔁 Migrate from UEFI to (Legacy) BIOS | Hacks.Wiki - A wikiful of hacks</title>
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<span>Hacks.Wiki - A wikiful of hacks</span>
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<div dir="auto" class="title is-1 has-text-weight-bold">🔁 Migrate from UEFI to (Legacy) BIOS</div>
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<span>Tuesday 28 February 2023</span>
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<span class="icon"> <i class="fa-solid fa-code-branch"></i> </span>
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<span>4 versions</span>
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<p dir="auto">Migrating Grub from a UEFI system to a BIOS (legacy) system 🔁</p>
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<p dir="auto">The general steps are:</p>
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<ul dir="auto">
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<li><input type="checkbox" disabled="" > Boot the computer using a live boot image - Eg. <a href="https://www.system-rescue.org/">System Rescue Image</a></li>
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<li><input type="checkbox" disabled="" > Mount the root filesystem<sup id="fnref:1"><a href="#fn:1" class="footnote-ref" role="doc-noteref">1</a></sup></li>
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<li><input type="checkbox" disabled="" > Bind mount <code>/dev</code>, <code>/sys</code>, <code>/proc</code> and <code>/run</code><sup id="fnref:2"><a href="#fn:2" class="footnote-ref" role="doc-noteref">2</a></sup></li>
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<li><input type="checkbox" disabled="" > Change your EFI boot partition to <code>EF02 BIOS boot partition</code><sup id="fnref:3"><a href="#fn:3" class="footnote-ref" role="doc-noteref">3</a></sup></li>
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<li><input type="checkbox" disabled="" > Chroot into the mounted file-system</li>
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<li><input type="checkbox" disabled="" > Re-install Grub <sup id="fnref:4"><a href="#fn:4" class="footnote-ref" role="doc-noteref">4</a></sup></li>
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</ul>
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<p dir="auto">Here is someone who has documented this process in good detail:</p>
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<div class="card my-5"> <header class="card-header"> <p class="card-header-title"> <strong><a href="https://logan.tw/posts/2015/05/17/grub-install-and-btrfs-root-file-system/">Grub Install and Btrfs Root File System | Logan's Note</a></strong> </p> </header> <div class="card-footer"> <a class="card-footer-item" href="https://logan.tw/posts/2015/05/17/grub-install-and-btrfs-root-file-system/">https://logan.tw/posts/2015/05/17/grub-install-and-btrfs-root-file-system/</a> </div></div>
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<p dir="auto"><a href="/+/tag/grub" class="tag is-info is-light">#grub</a> <a href="/+/tag/seabios" class="tag is-info is-light">#seabios</a> <a href="/+/tag/coreboot" class="tag is-info is-light">#coreboot</a> <a href="/+/tag/uefi" class="tag is-info is-light">#uefi</a></p>
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<div class="footnotes" role="doc-endnotes">
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<hr>
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<ol>
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<li id="fn:1">
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<p dir="auto"><a href="/Mounting%20BTRFS%20subvolumes">Mounting BTRFS subvolumes</a> needs an extra option <a href="#fnref:1" class="footnote-backref" role="doc-backlink">↩︎</a></p>
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</li>
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<li id="fn:2">
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<p dir="auto"><code>for f in dev sys proc run; do mount --bind /$f /mnt/$f; done</code> <a href="#fnref:2" class="footnote-backref" role="doc-backlink">↩︎</a></p>
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</li>
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<li id="fn:3">
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<p dir="auto">Remember to use <code>gdisk</code> if you have a GPT partition table. The BIOS boot partition code is <strong><code>EF02</code></strong> <a href="#fnref:3" class="footnote-backref" role="doc-backlink">↩︎</a></p>
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</li>
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<li id="fn:4">
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<p dir="auto"><code>grub-install /dev/sda</code> <a href="#fnref:4" class="footnote-backref" role="doc-backlink">↩︎</a></p>
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</li>
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<h1> See Also </h1>
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<ul>
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<li>
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<a href="/Detect%20UEFI%20or%20BIOS" dir="auto">👢 Detect UEFI or BIOS</a> <time class="has-text-grey is-size-7">Tuesday 28 February 2023</time>
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