source: postlfs/filesystems/uefi-bootloaders/grub-efi.xml@ 672f2a5

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../../general.ent">
  %general-entities;

  <!ENTITY grub-efi-download-http "https://ftp.gnu.org/gnu/grub/grub-&grub-version;.tar.xz">
  <!ENTITY grub-efi-download-ftp  " ">
  <!ENTITY grub-efi-md5sum        "cf0fd928b1e5479c8108ee52cb114363">
  <!ENTITY grub-efi-size          "6.3 MB">
  <!ENTITY grub-efi-buildsize     "137 MB">
  <!ENTITY grub-efi-time          "1.0 SBU (on 64-bit LFS)">

  <!ENTITY unifont-download-http  "https://unifoundry.com/pub/unifont/unifont-&unifont-version;/font-builds/unifont-&unifont-version;.pcf.gz">
  <!ENTITY unifont-md5sum         "8191ca4fce0eb6073d47c7573e6babc1">
  <!ENTITY unifont-size           "1.3 MB">

  <!ENTITY gcc-download-http      "&gnu-http;/gcc/gcc-&gcc-version;/gcc-&gcc-version;.tar.xz">
  <!ENTITY gcc-md5sum             "31c86f2ced76acac66992eeedce2fce2">
  <!ENTITY gcc-size               "77 MB">
]>

<sect1 id="grub-efi" xreflabel="GRUB-&grub-version; for EFI">
  <?dbhtml filename="grub-efi.html"?>

  <sect1info>
    <date>$Date$</date>
  </sect1info>

  <title>GRUB-&grub-version; for EFI</title>

  <indexterm zone="grub-efi">
    <primary sortas="a-grub-efi">grub-efi</primary>
  </indexterm>

  <sect2 role="package">
    <title>Introduction to GRUB</title>

    <para>
      The <application>GRUB</application> package provides GRand Unified
      Bootloader.  In this page it will be built with UEFI support, which
      is not enabled for GRUB built in LFS.
    </para>

    &lfs111_checked;

    <bridgehead renderas="sect3">Package Information</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>
          Download (HTTP): <ulink url="&grub-efi-download-http;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download (FTP): <ulink url="&grub-efi-download-ftp;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download MD5 sum: &grub-efi-md5sum;
        </para>
      </listitem>
      <listitem>
        <para>
          Download size: &grub-efi-size;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated disk space required: &grub-efi-buildsize;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated build time: &grub-efi-time;
        </para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">Additional Downloads</bridgehead>

    <itemizedlist spacing="compact">
      <title>Unicode font data used to display GRUB menu</title>
      <listitem>
        <para>
          Download (HTTP): <ulink url="&unifont-download-http;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download MD5 sum: &unifont-md5sum;
        </para>
      </listitem>
      <listitem>
        <para>
          Download size: &unifont-size;
        </para>
      </listitem>
    </itemizedlist>

    <itemizedlist spacing="compact">
      <title>GCC (only needed if building on 32-bit LFS)</title>
      <listitem>
        <para>
          Download (HTTP): <ulink url="&gcc-download-http;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download MD5 sum: &gcc-md5sum;
        </para>
      </listitem>
      <listitem>
        <para>
          Download size: &gcc-size;
        </para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">GRUB Dependencies</bridgehead>

    <bridgehead renderas="sect4">Required (runtime)</bridgehead>
    <para role="runtime">
      <xref linkend="efibootmgr"/>
    </para>

    <bridgehead renderas="sect4">Recommended</bridgehead>
    <para role="recommended">
      <xref linkend="freetype2"/>
    </para>

    <bridgehead renderas="sect4">Optional</bridgehead>
    <para role="optional">
      <xref linkend="lvm2"/>
    </para>

    <para condition="html" role="usernotes">User Notes:
    <ulink url="&blfs-wiki;/grub-efi"/></para>

  </sect2>

  <sect2 role="installation">
    <title>Installation of GRUB</title>

    <para>
      First, install font data as the
      <systemitem class="username">root</systemitem> user:
    </para>

<screen role="root"><userinput>mkdir -pv /usr/share/fonts/unifont &amp;&amp;
gunzip -c ../unifont-&unifont-version;.pcf.gz > /usr/share/fonts/unifont/unifont.pcf</userinput></screen>

    <warning>
      <para>Unset any environment variables which may affect the build:</para>

      <screen><userinput>unset {C,CPP,CXX,LD}FLAGS</userinput></screen>

      <para>Don't try <quote>tuning</quote> this package with custom
      compilation flags: this package is a bootloader, with low-level
      operations in the source code which is likely to be broken by some
      aggressive optimizations.</para>
    </warning>

    <para>If you are running a 32-bit LFS, prepare a 64-bit compiler:</para>

<!-- 'literal' is used deliberately to show this is only for 32-bit LFS -->
<screen><userinput>case $(uname -m) in i?86 )
    <literal>tar xf ../gcc-11.2.0.tar.xz
    mkdir gcc-11.2.0/build
    pushd gcc-11.2.0/build
        ../configure --prefix=$PWD/../../x86_64-gcc \
                     --target=x86_64-linux-gnu      \
                     --with-system-zlib             \
                     --enable-languages=c,c++       \
                     --with-ld=/usr/bin/ld
        make all-gcc
        make install-gcc
    popd
    export TARGET_CC=$PWD/x86_64-gcc/bin/x86_64-linux-gnu-gcc</literal>
esac</userinput></screen>

    <para>
      Build <application>GRUB</application> with the following commands:
    </para>

<screen><userinput>./configure --prefix=/usr        \
            --sysconfdir=/etc    \
            --disable-efiemu     \
            --enable-grub-mkfont \
            --with-platform=efi  \
            --target=x86_64      \
            --disable-werror     &amp;&amp;
unset TARGET_CC &amp;&amp;
make</userinput></screen>

    <para>
      This package does not have a test suite providing meaningful results.
    </para>

    <para>
      Now, as the <systemitem class="username">root</systemitem> user:
    </para>

<screen role="root"><userinput>make install &amp;&amp;
mv -v /etc/bash_completion.d/grub /usr/share/bash-completion/completions</userinput></screen>

  </sect2>

  <sect2 role="commands">
    <title>Command Explanations</title>

    <para>
      <parameter>--enable-grub-mkfont</parameter>: Build the tool named
      <command>grub-mkfont</command> to generate the font file for the boot
      loader from the font data we've installed.
    </para>

    <warning>
      <para>If the recommended dependency <xref linkend="freetype2"/> is not
      installed, it is possible to omit this option and build GRUB.  However,
      if <command>grub-mkfont</command> is not built, or the unicode font
      data is not available at the time GRUB is built, GRUB won't install
      any font for the boot loader.  The GRUB boot menu will be displayed
      using a coarse font and the early stage of kernel initialization will be
      in <quote>blind mode</quote> &mdash; you can't see any kernel messages before
      the graphics card driver is initialized.  It will be very difficult to
      diagnose some boot issues, especially if the graphics driver is
      built as module.</para>
    </warning>

    <para>
      <parameter>--with-platform=efi</parameter>: Ensures building GRUB with
      EFI enabled.
    </para>

    <para>
      <parameter>--target=x86_64</parameter>: Ensures building GRUB for
      x86_64 even if building on a 32-bit LFS system.  Most EFI firmwares
      on x86_64 does not support 32-bit bootloaders.
    </para>

    <para>
      <option>--target=i386</option>: A few 32-bit x86 platforms have EFI
      support.  And, some x86_64 platforms have a 32-bit EFI implementation,
      but they are very old and rare. Use this instead of
      <parameter>--target=x86_64</parameter> if you are
      <emphasis role='bold'>absolutely sure</emphasis> that LFS is running
      on such a system.
    </para>

  </sect2>

  <sect2>
    <title>Configuring GRUB</title>

    <para>
      Using GRUB to make the LFS system bootable on UEFI platform will be
      discussed in <xref linkend="grub-setup"/>.
    </para>
  </sect2>

  <sect2 role="content">
    <title>Contents</title>

    <para>See the page for GRUB in LFS book.</para>
  </sect2>

</sect1>