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-<table class="head">
- <tr>
- <td class="head-ltitle">UEFI(8)</td>
- <td class="head-vol">System Manager's Manual</td>
- <td class="head-rtitle">UEFI(8)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">UEFI</code> &#x2014; <span class="Nd">Unified
- Extensible Firmware Interface bootstrapping procedures</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">UEFI</code> Unified Extensible Firmware
- Interface provides boot- and run-time services to operating systems.
- <code class="Nm">UEFI</code> is a replacement for the legacy BIOS on the
- i386 and amd64 CPU architectures, and is also used on arm, arm64 and riscv
- architectures.</p>
-<p class="Pp">The UEFI specification is the successor to the Extensible Firmware
- Interface (EFI) specification. The terms UEFI and EFI are often used
- interchangeably.</p>
-<p class="Pp">The <code class="Nm">UEFI</code> boot process loads system
- bootstrap code located in an EFI System Partition (ESP). The ESP is a GPT or
- MBR partition with a specific identifier that contains an
- <a class="Xr">msdosfs(4)</a> FAT file system with a specified file
- hierarchy.</p>
-<table class="Bl-column Bd-indent">
- <tr id="Partition">
- <td><a class="permalink" href="#Partition"><b class="Sy">Partition
- Scheme</b></a></td>
- <td><a class="permalink" href="#ESP"><b class="Sy" id="ESP">ESP
- Identifier</b></a></td>
- </tr>
- <tr>
- <td>GPT</td>
- <td>C12A7328-F81F-11D2-BA4B-00A0C93EC93B</td>
- </tr>
- <tr>
- <td>MBR</td>
- <td>0xEF</td>
- </tr>
-</table>
-<p class="Pp">The <code class="Nm">UEFI</code> boot process proceeds as
- follows:</p>
-<ol class="Bl-enum Bd-indent Bl-compact">
- <li><code class="Nm">UEFI</code> firmware runs at power up and searches for an
- OS loader in the EFI system partition. The path to the loader may be set
- by an EFI environment variable managed by <a class="Xr">efibootmgr(8)</a>.
- If not set, an architecture-specific default is used.
- <table class="Bl-column Bd-indent">
- <tr id="Architecture">
- <td><a class="permalink" href="#Architecture"><b class="Sy">Architecture</b></a></td>
- <td><a class="permalink" href="#Default"><b class="Sy" id="Default">Default
- Path</b></a></td>
- </tr>
- <tr>
- <td>amd64</td>
- <td><span class="Pa">/EFI/BOOT/BOOTX64.EFI</span></td>
- </tr>
- <tr>
- <td>arm</td>
- <td><span class="Pa">/EFI/BOOT/BOOTARM.EFI</span></td>
- </tr>
- <tr>
- <td>arm64</td>
- <td><span class="Pa">/EFI/BOOT/BOOTAA64.EFI</span></td>
- </tr>
- <tr>
- <td>i386</td>
- <td><span class="Pa">/EFI/BOOT/BOOTIA32.EFI</span></td>
- </tr>
- <tr>
- <td>riscv</td>
- <td><span class="Pa">/EFI/BOOT/BOOTRISCV64.EFI</span></td>
- </tr>
- </table>
- <p class="Pp">The default <code class="Nm">UEFI</code> boot configuration
- for <span class="Ux">FreeBSD</span> installs
- <span class="Pa">loader.efi</span> in the default path.</p>
- </li>
- <li><span class="Pa">loader.efi</span> reads boot configuration from
- <span class="Pa">/boot.config</span> or
- <span class="Pa">/boot/config</span>.</li>
- <li><span class="Pa">loader.efi</span> loads and boots the kernel, as
- described in <a class="Xr">loader.efi(8)</a>.</li>
-</ol>
-<p class="Pp">The <a class="Xr">vt(4)</a> system console is automatically
- selected when booting via <code class="Nm">UEFI</code>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="FILES"><a class="permalink" href="#FILES">FILES</a></h1>
-<p class="Pp"><code class="Nm">UEFI</code> bootstrap</p>
-<dl class="Bl-tag Bl-compact">
- <dt><span class="Pa">/boot/loader.efi</span></dt>
- <dd>Final stage bootstrap</dd>
- <dt><span class="Pa">/boot/kernel/kernel</span></dt>
- <dd>Default kernel</dd>
- <dt><span class="Pa">/boot/kernel.old/kernel</span></dt>
- <dd>Typical non-default kernel (optional)</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">msdosfs(4)</a>, <a class="Xr">vt(4)</a>,
- <a class="Xr">boot.config(5)</a>, <a class="Xr">boot(8)</a>,
- <a class="Xr">efibootmgr(8)</a>, <a class="Xr">efidp(8)</a>,
- <a class="Xr">efivar(8)</a>, <a class="Xr">gpart(8)</a>,
- <a class="Xr">loader.efi(8)</a>, <a class="Xr">uefisign(8)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">EFI boot support for the ia64 architecture first appeared in
- <span class="Ux">FreeBSD 5.0</span>. <code class="Nm">UEFI</code> boot
- support for amd64 first appeared in <span class="Ux">FreeBSD 10.1</span>;
- for arm64 in <span class="Ux">FreeBSD 11.0</span>; for armv7 in
- <span class="Ux">FreeBSD 12.0</span>; and for riscv in
- <span class="Ux">FreeBSD 13.0</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
-<p class="Pp">There is no support for 32-bit i386 booting via UEFI.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">August 31, 2023</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>