[756a787] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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| 4 | <!ENTITY % general-entities SYSTEM "../../../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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| 7 |
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| 8 | <sect1 id="grub-setup" xreflabel="Using GRUB to Set Up the Boot Process with UEFI">
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| 9 | <?dbhtml filename="grub-setup.html"?>
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| 10 |
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| 11 |
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| 12 | <title>Using GRUB to Set Up the Boot Process with UEFI</title>
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| 13 |
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| 14 | <sect2>
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| 15 | <title>Turn Off Secure Boot</title>
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| 16 |
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| 17 | <para>
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[d5cc78a] | 18 | BLFS does not have the essential packages to support Secure Boot. To
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[c8391c3d] | 19 | set up the boot process with GRUB and UEFI in BLFS, Secure
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[756a787] | 20 | Boot must be turned off from the configuration interface of the
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| 21 | firmware. Read the documentation provided by the manufacturer of your
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| 22 | system to find out how.
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| 23 | </para>
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| 24 | </sect2>
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| 25 |
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| 26 | <sect2>
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| 27 | <title>Create an Emergency Boot Disk</title>
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| 28 |
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| 29 | <para>
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| 30 | Ensure that an emergency boot disk is ready to <quote>rescue</quote>
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[d5cc78a] | 31 | the system in case the system becomes un-bootable. To make an
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| 32 | emergency boot disk with GRUB for an EFI based system, find a spare
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[756a787] | 33 | USB flash drive and create a
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| 34 | <systemitem class="filesystem">vfat</systemitem> file system on it.
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| 35 | Install <xref linkend="dosfstools"/> first, then
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| 36 | as the <systemitem class="username">root</systemitem> user:
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| 37 | </para>
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| 38 |
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| 39 | <warning>
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| 40 | <para>
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| 41 | The following command will erase all directories and files in the
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| 42 | partition. Make sure your USB flash drive contains no data which
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| 43 | will be needed, and change <userinput>sdx1</userinput> to the
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| 44 | device node corresponding to the first partition of the USB flash
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| 45 | drive. Be careful not to overwrite your hard drive with a typo!
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| 46 | </para>
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| 47 | </warning>
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| 48 |
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| 49 | <screen role="nodump"><userinput>mkfs.vfat /dev/sdx1</userinput></screen>
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| 50 |
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| 51 | <para>
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| 52 | Still as the <systemitem class="username">root</systemitem> user, use
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[b9c353b] | 53 | the <command>fdisk</command> utility to set the first partition
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[756a787] | 54 | of the USB flash drive to be an <quote>EFI system</quote> partition
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| 55 | (change <userinput>sdx</userinput> to the device node corresponding
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| 56 | to your USB flash drive):
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| 57 | </para>
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| 58 |
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| 59 | <screen role="nodump"><userinput>fdisk /dev/sdx</userinput>
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| 60 | <literal>
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[16f7f0e] | 61 | Welcome to fdisk (util-linux 2.38.1).
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[756a787] | 62 | Changes will remain in memory only, until you decide to write them.
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| 63 | Be careful before using the write command.
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| 64 |
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| 65 |
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| 66 | Command (m for help): </literal><userinput>t</userinput>
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[43397b0e] | 67 | <literal>Partition number (1-9, default 9): </literal><userinput>1</userinput>
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| 68 | <literal>Partition type or alias (type L to list all): </literal><userinput>uefi</userinput>
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| 69 | <literal>Changed type of partition 'Linux filesystem' to 'EFI System'.
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[756a787] | 70 |
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| 71 | Command (m for help): </literal><userinput>w</userinput>
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| 72 | <literal>The partition table has been altered.
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| 73 | Calling ioctl() to re-read partition table.
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| 74 | Syncing disks.</literal></screen>
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| 75 |
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| 76 | <para>
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| 77 | Still as the <systemitem class="username">root</systemitem> user,
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| 78 | create a mount point for the EFI partition on the USB flash drive
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| 79 | and mount it:
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| 80 | </para>
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| 81 |
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| 82 | <screen role="nodump"><userinput>mkdir -pv /mnt/rescue &&
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| 83 | mount -v -t vfat /dev/sdx1 /mnt/rescue</userinput></screen>
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| 84 |
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| 85 | <para>
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| 86 | Install GRUB for EFI on the partition:
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| 87 | </para>
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| 88 |
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[1977aef] | 89 | <screen role="nodump"><userinput>grub-install --target=x86_64-efi --removable --efi-directory=/mnt/rescue --boot-directory=/mnt/rescue</userinput></screen>
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[756a787] | 90 |
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| 91 | <para>
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| 92 | Unmount the partition:
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| 93 | </para>
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| 94 |
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| 95 | <screen role="nodump"><userinput>umount /mnt/rescue</userinput></screen>
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| 96 |
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| 97 | <para>
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[c8391c3d] | 98 | Now the USB flash drive can be used as an emergency boot disk on any x86-64
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[d5cc78a] | 99 | UEFI platform. It will boot the system and show the GRUB shell. Then you
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[c8391c3d] | 100 | can type commands to boot your operating system from the hard drive.
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[d5cc78a] | 101 | To learn how to select the boot device, read the manual of your
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[756a787] | 102 | motherboard or laptop.
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| 103 | </para>
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| 104 |
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| 105 | </sect2>
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| 106 |
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| 107 | <sect2 role="kernel" id="uefi-kernel">
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| 108 | <title>Kernel Configuration for UEFI support</title>
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| 109 |
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| 110 | <para>
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| 111 | Enable the following options in the kernel configuration and recompile
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| 112 | the kernel if necessary:
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| 113 | </para>
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| 114 |
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| 115 | <screen><literal>Processor type and features --->
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[b804521] | 116 | [*] EFI runtime service support [CONFIG_EFI]
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| 117 | [*] EFI stub support [CONFIG_EFI_STUB]
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[756a787] | 118 | Enable the block layer --->
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| 119 | Partition Types --->
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[b804521] | 120 | [*] Advanced partition selection [CONFIG_PARTITION_ADVANCED]
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| 121 | [*] EFI GUID Partition support [CONFIG_EFI_PARTITION]
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[756a787] | 122 | Device Drivers --->
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[62d4a239] | 123 | Firmware Drivers --->
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[b804521] | 124 | [*] Mark VGA/VBE/EFI FB as generic system framebuffer [CONFIG_SYSFB_SIMPLEFB]
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[756a787] | 125 | Graphics support --->
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[b804521] | 126 | <*> Direct Rendering Manager [CONFIG_DRM]
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[34e3e2d] | 127 | [*] Enable legacy fbdev support for your modesetting driver [CONFIG_DRM_FBDEV_EMULATION]
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[b804521] | 128 | <*> Simple framebuffer driver [CONFIG_DRM_SIMPLEDRM]
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[756a787] | 129 | Frame buffer Devices --->
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[b804521] | 130 | <*> Support for frame buffer devices ---> [CONFIG_FB]
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[756a787] | 131 | Console display driver support --->
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[b804521] | 132 | [*] Framebuffer Console support [CONFIG_FRAMEBUFFER_CONSOLE]
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[756a787] | 133 | File systems --->
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[7027897] | 134 | <DOS/FAT/EXFAT/NT Filesystems --->
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[b804521] | 135 | <*/M> VFAT (Windows-95) fs support [CONFIG_VFAT_FS]
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[756a787] | 136 | Pseudo filesystems --->
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[b804521] | 137 | <*/M> EFI Variable filesystem [CONFIG_EFIVAR_FS]</literal></screen>
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[756a787] | 138 |
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| 139 | <variablelist>
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[c8391c3d] | 140 | <title>The meaning of the configuration options:</title>
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[756a787] | 141 |
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| 142 | <varlistentry>
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| 143 | <term><parameter>CONFIG_EFI_STUB</parameter></term>
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| 144 | <listitem>
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[e8d6204] | 145 | <para>On EFI systems, GRUB boots the Linux kernel by invoking the
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| 146 | EFI firmware to load it as an EFI application. So, EFI stub is
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| 147 | needed to wrap the kernel as an EFI application.</para>
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[756a787] | 148 | </listitem>
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| 149 | </varlistentry>
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| 150 |
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| 151 | <varlistentry>
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[217e54c9] | 152 | <term>
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| 153 | <parameter>CONFIG_SYSFB_SIMPLEFB</parameter>,
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| 154 | <parameter>CONFIG_DRM</parameter>,
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[34e3e2d] | 155 | <parameter>CONFIG_DRM_FBDEV_EMULATION</parameter>,
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[9c44927] | 156 | <parameter>CONFIG_DRM_SIMPLEDRM</parameter>,
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[217e54c9] | 157 | <parameter>CONFIG_FB</parameter>, and
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| 158 | <parameter>CONFIG_FRAMEBUFFER_CONSOLE</parameter></term>
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[756a787] | 159 | <listitem>
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[34e3e2d] | 160 | <para>The combination of these options provides the Linux console
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| 161 | support on top of the UEFI framebuffer. To allow the kernel to
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| 162 | print debug messages at an early boot stage, they shouldn't be
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| 163 | built as kernel modules unless an initramfs will be used.</para>
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[756a787] | 164 | </listitem>
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| 165 | </varlistentry>
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| 166 |
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| 167 | </variablelist>
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| 168 |
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| 169 | </sect2>
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| 170 |
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| 171 | <sect2>
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| 172 | <title>Find or Create the EFI System Partition</title>
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| 173 |
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| 174 | <para>
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[c8391c3d] | 175 | On EFI based systems, the bootloaders are installed in a special FAT32
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[d5cc78a] | 176 | partition called an <emphasis>EFI System Partition</emphasis> (ESP).
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[c8391c3d] | 177 | If your system supports EFI, and a recent version of some Linux
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[756a787] | 178 | distribution or Windows is pre-installed, it's likely that the ESP
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[c8391c3d] | 179 | has already been created. As the
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[756a787] | 180 | <systemitem class="username">root</systemitem> user, list all the
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| 181 | partitions on your hard drive (replace <userinput>sda</userinput>
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[d5cc78a] | 182 | with the device corresponding to the appropriate hard drive):
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[756a787] | 183 | </para>
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| 184 |
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| 185 | <screen role="nodump"><userinput>fdisk -l /dev/sda</userinput></screen>
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| 186 |
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| 187 | <para>
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| 188 | The <quote>Type</quote> column of the ESP should be
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| 189 | <literal>EFI System</literal>.
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| 190 | </para>
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| 191 |
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| 192 | <para>
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[c8391c3d] | 193 | If the system or the hard drive is new, or it's the first
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| 194 | installation of a UEFI-booted OS on the system, the ESP may not exist.
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[d5cc78a] | 195 | In that case, create a new partition, make a
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[756a787] | 196 | <systemitem class="filesystem">vfat</systemitem> file system on it,
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[d5cc78a] | 197 | and set the partition type to <quote>EFI system</quote>. See the
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[756a787] | 198 | instructions for the emergency boot device above as a reference.
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| 199 | </para>
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| 200 |
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| 201 | <warning>
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| 202 | <para>
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[c8391c3d] | 203 | Some (old) UEFI implementations may require the ESP to be the first
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[756a787] | 204 | partition on the disk.
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| 205 | </para>
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| 206 | </warning>
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| 207 |
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| 208 | <para>
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| 209 | Now, as the <systemitem class="username">root</systemitem> user,
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| 210 | create the mount point for the ESP, and mount it (replace
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| 211 | <userinput>sda1</userinput> with the device node corresponding to
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| 212 | the ESP):
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| 213 | </para>
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| 214 |
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| 215 | <screen role="nodump"><userinput>mkdir -pv /boot/efi &&
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| 216 | mount -v -t vfat /dev/sda1 /boot/efi</userinput></screen>
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| 217 |
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| 218 | <para>
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[d5cc78a] | 219 | Add an entry for the ESP in
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[756a787] | 220 | <filename>/etc/fstab</filename>, so it will be mounted automatically
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| 221 | during system boot:
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| 222 | </para>
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| 223 |
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| 224 | <screen role="nodump"><userinput>cat >> /etc/fstab << EOF</userinput>
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| 225 | <literal>/dev/sda1 /boot/efi vfat defaults 0 1</literal>
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| 226 | <userinput>EOF</userinput></screen>
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| 227 |
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| 228 | </sect2>
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| 229 |
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[6db606f] | 230 | <sect2>
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| 231 | <title>Minimal Boot Configuration with GRUB and EFI</title>
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| 232 |
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| 233 | <para>
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| 234 | On UEFI based systems, GRUB works by installing an EFI application
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| 235 | (a special kind of executable) into the ESP. The EFI firmware will
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| 236 | search boot loaders in EFI applications from boot entries recorded
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| 237 | in EFI variables, and additionally a hardcoded path
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| 238 | <filename>EFI/BOOT/BOOTX64.EFI</filename>. Normally, a boot loader
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| 239 | should be installed into a custom path and the path should be recorded
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[c8391c3d] | 240 | in the EFI variables. The use of the hardcoded path should be
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| 241 | avoided if possible. However, in some cases we have to use
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[6db606f] | 242 | the hardcoded path:
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| 243 | </para>
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| 244 |
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| 245 | <itemizedlist>
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| 246 | <listitem>
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| 247 | <para>
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[c8391c3d] | 248 | The system is not booted with EFI yet, making EFI variables
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[6db606f] | 249 | inaccessible.
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| 250 | </para>
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| 251 | </listitem>
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| 252 | <listitem>
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| 253 | <para>
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[c8391c3d] | 254 | The EFI firmware is 64-bit but the LFS system is 32-bit, making
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[6db606f] | 255 | EFI variables inaccessible because the kernel cannot invoke EFI
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| 256 | runtime services with a different virtual address length.
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| 257 | </para>
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| 258 | </listitem>
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| 259 | <listitem>
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| 260 | <para>
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[c8391c3d] | 261 | LFS is built for a Live USB, so we cannot rely on EFI variables,
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| 262 | which are stored in NVRAM or EEPROM on the local machine.
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[6db606f] | 263 | </para>
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| 264 | </listitem>
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| 265 | <listitem>
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| 266 | <para>
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[c8391c3d] | 267 | You are unable or unwilling to install the
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[6db606f] | 268 | <application>efibootmgr</application> for manipulating boot
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| 269 | entries in EFI variables.
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| 270 | </para>
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| 271 | </listitem>
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| 272 | </itemizedlist>
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| 273 |
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| 274 | <para>
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[c8391c3d] | 275 | In these cases, follow these instructions to install the GRUB EFI
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[6db606f] | 276 | application into the hardcoded path and make a minimal boot
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[c8391c3d] | 277 | configuration. Otherwise it's better to skip ahead and set up the
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| 278 | boot configuration normally.
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[6db606f] | 279 | </para>
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| 280 |
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| 281 | <para>
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[c8391c3d] | 282 | To install GRUB with the EFI application in the hardcoded
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[6db606f] | 283 | path <filename>EFI/BOOT/BOOTX64.EFI</filename>, first ensure the boot
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[b38aed5] | 284 | partition is mounted at <filename class="directory">/boot</filename>
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[c8391c3d] | 285 | and the ESP is mounted at
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| 286 | <filename class="directory">/boot/efi</filename>. Then, as the &root;
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[6db606f] | 287 | user, run the command:
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| 288 | </para>
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| 289 |
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| 290 | <note>
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| 291 | <para>
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[c8391c3d] | 292 | This command will overwrite
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[6db606f] | 293 | <filename>/boot/efi/EFI/BOOT/BOOTX64.EFI</filename>. It may break a
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| 294 | bootloader already installed there. Back it up if you are not sure.
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| 295 | </para>
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| 296 | </note>
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| 297 |
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| 298 | <screen role="nodump"><userinput>grub-install --target=x86_64-efi --removable</userinput></screen>
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| 299 |
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| 300 | <para>
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[c8391c3d] | 301 | This command will install the GRUB EFI application into the hardcoded path
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[6db606f] | 302 | <filename>/boot/efi/EFI/BOOT/BOOTX64.EFI</filename>, so the EFI
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| 303 | firmware can find and load it. The remaining GRUB files are installed
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[c8391c3d] | 304 | in the <filename class="directory">/boot/grub</filename> directory and
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[6db606f] | 305 | will be loaded by <filename>BOOTX64.EFI</filename> during system boot.
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| 306 | </para>
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| 307 |
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| 308 | <note>
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| 309 | <para>
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[c8391c3d] | 310 | The EFI firmware usually prefers the EFI applications with a path
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| 311 | stored in EFI variables to the EFI
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[6db606f] | 312 | application at the hardcoded path. So you may need to invoke the
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| 313 | boot selection menu or firmware setting interface to select the
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| 314 | newly installed GRUB manually on the next boot. Read the manual of
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[c8391c3d] | 315 | your motherboard or laptop to learn how.
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[6db606f] | 316 | </para>
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| 317 | </note>
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| 318 |
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| 319 | <para>
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[c8391c3d] | 320 | If you've followed the instructions in this section and set up a minimal boot
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| 321 | configuration, now skip ahead to
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[6db606f] | 322 | <quote>Creating the GRUB Configuration File</quote>.
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| 323 | </para>
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| 324 | </sect2>
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| 325 |
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[756a787] | 326 | <sect2>
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| 327 | <title>Mount the EFI Variable File System</title>
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| 328 |
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| 329 | <para>
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[d5cc78a] | 330 | The installation of GRUB on a UEFI platform requires that the EFI Variable
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[c8391c3d] | 331 | file system, <systemitem class="filesystem">efivarfs</systemitem>, is
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[564a569] | 332 | mounted. As the <systemitem class="username">root</systemitem> user,
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| 333 | mount it if it's not already mounted:
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[756a787] | 334 | </para>
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| 335 |
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[564a569] | 336 | <screen role="nodump"><userinput>mountpoint /sys/firmware/efi/efivars || mount -v -t efivarfs efivarfs /sys/firmware/efi/efivars</userinput></screen>
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[756a787] | 337 |
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| 338 | <note revision="systemd">
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| 339 | <para>
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| 340 | If the system is booted with UEFI and systemd,
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| 341 | <systemitem class="filesystem">efivarfs</systemitem> will be mounted
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[c8391c3d] | 342 | automatically. However, in the LFS chroot environment it still needs to
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[756a787] | 343 | be mounted manually.
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| 344 | </para>
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| 345 | </note>
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| 346 |
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| 347 | <para revision="sysv">
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[d5cc78a] | 348 | Now add an entry for the
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[756a787] | 349 | <systemitem class="filesystem">efivarfs</systemitem> in
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[d5cc78a] | 350 | <filename>/etc/fstab</filename> so it will be mounted automatically
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[756a787] | 351 | during system boot:
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| 352 | </para>
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| 353 |
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| 354 | <screen revision="sysv" role="nodump"><userinput>cat >> /etc/fstab << EOF</userinput>
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[6ca17c82] | 355 | <literal>efivarfs /sys/firmware/efi/efivars efivarfs defaults 0 0</literal>
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[756a787] | 356 | <userinput>EOF</userinput></screen>
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| 357 |
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| 358 | <warning>
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| 359 | <para>
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| 360 | If the system is not booted with UEFI, the directory
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| 361 | <filename class="directory">/sys/firmware/efi</filename> will be
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| 362 | missing. In this case you should boot the system in UEFI mode with
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[c8391c3d] | 363 | the emergency boot disk or using a minimal boot configuration created as
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[6db606f] | 364 | above, then mount
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| 365 | <systemitem class="filesystem">efivarfs</systemitem> and continue.
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[756a787] | 366 | </para>
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| 367 | </warning>
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| 368 | </sect2>
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| 369 |
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| 370 | <sect2>
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| 371 | <title>Setting Up the Configuration</title>
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| 372 |
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| 373 | <para>
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| 374 | On UEFI based systems, GRUB works by installing an EFI application
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[d5cc78a] | 375 | (a special kind of executable) into
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[756a787] | 376 | <filename class="directory">/boot/efi/EFI/[id]/grubx64.efi</filename>,
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| 377 | where <filename class="directory">/boot/efi</filename> is the mount
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| 378 | point of the ESP, and <literal>[id]</literal> is replaced with an
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| 379 | identifier specified in the <command>grub-install</command> command
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[d5cc78a] | 380 | line. GRUB will create an entry in the EFI variables containing
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| 381 | the path <literal>EFI/[id]/grubx64.efi</literal> so the EFI firmware
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[756a787] | 382 | can find <filename>grubx64.efi</filename> and load it.
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| 383 | </para>
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| 384 |
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| 385 | <para>
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| 386 | <filename>grubx64.efi</filename> is very lightweight (136 KB with
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[16f7f0e] | 387 | GRUB-2.06) so it will not use much space in the ESP. A typical ESP
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[d5cc78a] | 388 | size is 100 MB (for Windows boot manager, which uses about 50 MB in
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[c8391c3d] | 389 | the ESP). Once <filename>grubx64.efi</filename> has been loaded by the
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| 390 | firmware, it will load GRUB modules from the boot partition.
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[756a787] | 391 | The default location is
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| 392 | <filename class="directory">/boot/grub</filename>.
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| 393 | </para>
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| 394 |
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| 395 | <para>
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| 396 | As the <systemitem class="username">root</systemitem> user, install
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| 397 | the GRUB files into <filename>/boot/efi/EFI/LFS/grubx64.efi</filename>
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[d5cc78a] | 398 | and <filename class="directory">/boot/grub</filename>. Then set up the
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[756a787] | 399 | boot entry in the EFI variables:
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| 400 | </para>
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| 401 |
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| 402 | <screen role="nodump"><userinput>grub-install --bootloader-id=LFS --recheck</userinput></screen>
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| 403 |
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| 404 | <para>
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| 405 | If the installation is successful, the output should be:
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| 406 | </para>
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| 407 |
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| 408 | <screen role="nodump"><literal>Installing for x86_64-efi platform.
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| 409 | Installation finished. No error reported.</literal></screen>
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| 410 |
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| 411 | <para>
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[c8391c3d] | 412 | Issue the <command>efibootmgr | cut -f 1</command> command to recheck the EFI boot
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[756a787] | 413 | configuration. An example of the output is:
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| 414 | </para>
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| 415 |
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| 416 | <screen role="nodump"><literal>BootCurrent: 0000
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| 417 | Timeout: 1 seconds
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| 418 | BootOrder: 0005,0000,0002,0001,0003,0004
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| 419 | Boot0000* ARCH
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| 420 | Boot0001* UEFI:CD/DVD Drive
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| 421 | Boot0002* Windows Boot Manager
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| 422 | Boot0003* UEFI:Removable Device
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| 423 | Boot0004* UEFI:Network Device
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| 424 | Boot0005* LFS</literal></screen>
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| 425 |
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| 426 | <para>
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[d5cc78a] | 427 | Note that <literal>0005</literal> is the first in the
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[756a787] | 428 | <literal>BootOrder</literal>, and <literal>Boot0005</literal>
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[8558044] | 429 | is <literal>LFS</literal>. This means that on the next boot, the
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[d5cc78a] | 430 | version of GRUB installed by LFS will be used to boot the system.
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[756a787] | 431 | </para>
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| 432 |
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| 433 | </sect2>
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| 434 |
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| 435 | <sect2>
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| 436 | <title>Creating the GRUB Configuration File</title>
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| 437 |
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| 438 | <indexterm zone="grub-setup grub-video">
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| 439 | <primary sortas="e-boot-grub-grub-cfg">/boot/grub/grub.cfg</primary>
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| 440 | </indexterm>
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| 441 |
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| 442 | <para>
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| 443 | Generate <filename>/boot/grub/grub.cfg</filename> to configure the
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| 444 | boot menu of GRUB:
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| 445 | </para>
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| 446 |
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| 447 | <screen role="nodump"><userinput>cat > /boot/grub/grub.cfg << EOF</userinput>
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| 448 | <literal># Begin /boot/grub/grub.cfg
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| 449 | set default=0
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| 450 | set timeout=5
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| 451 |
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| 452 | insmod part_gpt
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| 453 | insmod ext2
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| 454 | set root=(hd0,2)
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| 455 |
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| 456 | if loadfont /boot/grub/fonts/unicode.pf2; then
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| 457 | set gfxmode=auto
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| 458 | insmod all_video
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| 459 | terminal_output gfxterm
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| 460 | fi
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| 461 |
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[8e843925] | 462 | menuentry "GNU/Linux, Linux 6.1.11-lfs-11.3" {
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| 463 | linux /boot/vmlinuz-6.1.11-lfs-11.3 root=/dev/sda2 ro
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[756a787] | 464 | }
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| 465 |
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| 466 | menuentry "Firmware Setup" {
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| 467 | fwsetup
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| 468 | }</literal>
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| 469 | <userinput>EOF</userinput></screen>
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| 470 |
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| 471 | <para>
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| 472 | <literal>(hd0,2)</literal>, <literal>sda2</literal>, and
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[8e843925] | 473 | <literal>6.1.11-lfs-11.3</literal> must match your
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[756a787] | 474 | configuration.
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| 475 | </para>
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| 476 |
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| 477 | <note>
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| 478 | <para>
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[c8391c3d] | 479 | From GRUB's perspective, the files are relative to the partitions
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| 480 | used. If you used a separate /boot partition, remove /boot from the
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[756a787] | 481 | above paths (to kernel and to <filename>unicode.pf2</filename>). You
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[c8391c3d] | 482 | will also need to change the "set root" line to point to the boot
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[756a787] | 483 | partition.
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| 484 | </para>
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| 485 | </note>
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| 486 |
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| 487 | <para>
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| 488 | The <literal>Firmware Setup</literal> entry can be used to enter the
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| 489 | configuration interface provided by the firmware (sometimes called
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[9039d65] | 490 | <quote>BIOS configuration</quote>).
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[756a787] | 491 | </para>
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| 492 | </sect2>
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| 493 |
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| 494 | <sect2>
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| 495 | <title>Dual-booting with Windows</title>
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| 496 |
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| 497 | <para>
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| 498 | Add a menu entry for Windows into <filename>grub.cfg</filename>:
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| 499 | </para>
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| 500 |
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| 501 | <screen role="nodump"><userinput>cat >> /boot/grub/grub.cfg << EOF</userinput>
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| 502 | <literal># Begin Windows addition
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| 503 |
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[16f7f0e] | 504 | menuentry "Windows 11" {
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[756a787] | 505 | insmod fat
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| 506 | insmod chain
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| 507 | set root=(hd0,1)
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| 508 | chainloader /EFI/Microsoft/Boot/bootmgfw.efi
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| 509 | }</literal>
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| 510 | <userinput>EOF</userinput></screen>
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| 511 |
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| 512 | <para>
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| 513 | <literal>(hd0,1)</literal> should be replaced with the GRUB
|
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[d5cc78a] | 514 | designated name for the ESP. The <literal>chainloader</literal>
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[756a787] | 515 | directive can be used to tell GRUB to run another EFI executable,
|
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| 516 | in this case the Windows Boot Manager. You may put more usable tools
|
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[8558044] | 517 | in EFI executable format (for example, an EFI shell) into the ESP and
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[c8391c3d] | 518 | create GRUB entries for them, as well.
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[756a787] | 519 | </para>
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| 520 |
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| 521 | </sect2>
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| 522 |
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| 523 | </sect1>
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