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Turn Off Secure Boot
BLFS does not have the essential packages to support Secure Boot. To set up the boot process with GRUB and UEFI in BLFS, Secure Boot must be turned off from the configuration interface of the firmware. Read the documentation provided by the manufacturer of your system to find out how.
Kernel Configuration for UEFI support
Enable the following options in the kernel configuration and recompile the kernel if necessary:
The meaning of the configuration options:
<parameter>CONFIG_PARTITION_ADVANCED</parameter>
If it's not enabled, <parameter>CONFIG_EFI_PARTITION</parameter> will be enabled automatically. But when it's enabled, you must set <parameter>CONFIG_EFI_PARTITION</parameter> to enabled as well.
<parameter>CONFIG_SYSFB_SIMPLEFB</parameter>, <parameter>CONFIG_DRM</parameter>, <parameter>CONFIG_DRM_FBDEV_EMULATION</parameter>, <parameter>CONFIG_DRM_SIMPLEDRM</parameter>, <parameter>CONFIG_FB</parameter>, and <parameter>CONFIG_FRAMEBUFFER_CONSOLE</parameter>
The combination of these options provides the Linux console support on top of the UEFI framebuffer. To allow the kernel to print debug messages at an early boot stage, they shouldn't be built as kernel modules unless an initramfs will be used.
UEFI
Create an Emergency Boot Disk
Ensure that an emergency boot disk is ready to <quote>rescue</quote> the system in case the system becomes un-bootable. To make an emergency boot disk with GRUB for an EFI based system, find a spare USB flash drive and create a <systemitem class="filesystem">vfat</systemitem> file system on it. Install <xref linkend="dosfstools"/> first, then as the <systemitem class="username">root</systemitem> user:
The following command will erase all directories and files in the partition. Make sure your USB flash drive contains no data which will be needed, and change <userinput>sdx1</userinput> to the device node corresponding to the first partition of the USB flash drive. Be careful not to overwrite your hard drive with a typo!
<userinput>mkfs.vfat /dev/sdx1</userinput>
Still as the <systemitem class="username">root</systemitem> user, use the <command>fdisk</command> utility to set the first partition of the USB flash drive to be an <quote>EFI system</quote> partition (change <userinput>sdx</userinput> to the device node corresponding to your USB flash drive):
<userinput>fdisk /dev/sdx</userinput>
<literal>
Welcome to fdisk (util-linux 2.39.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): </literal><userinput>t</userinput>
<literal>Partition number (1-9, default 9): </literal><userinput>1</userinput>
<literal>Partition type or alias (type L to list all): </literal><userinput>uefi</userinput>
<literal>Changed type of partition 'Linux filesystem' to 'EFI System'.

Command (m for help): </literal><userinput>w</userinput>
<literal>The partition table has been altered.
Syncing disks.</literal>
Still as the <systemitem class="username">root</systemitem> user, create a mount point for the EFI partition on the USB flash drive and mount it:
<userinput>mount --mkdir -v -t vfat /dev/sdx1 -o codepage=437,iocharset=iso8859-1 \
/mnt/rescue</userinput>
Install GRUB for EFI on the partition:
<userinput>grub-install --target=x86_64-efi --removable \
--efi-directory=/mnt/rescue --boot-directory=/mnt/rescue</userinput>
Unmount the partition:
<userinput>umount /mnt/rescue</userinput>
Now the USB flash drive can be used as an emergency boot disk on any x86-64 UEFI platform. To learn how to select this flash drive as the boot device, read the manual of your motherboard or laptop. It will boot the system and show the GRUB shell. Then you can type commands to boot your operating system from the hard drive.
Find or Create the EFI System Partition
On EFI based systems, the bootloaders are installed in a special FAT32 partition called an <emphasis>EFI System Partition</emphasis> (ESP). If your system supports EFI, and a recent version of some Linux distribution or Windows is pre-installed, it's likely that the ESP has already been created. As the <systemitem class="username">root</systemitem> user, list all the partitions on your hard drive (replace <userinput>sda</userinput> with the device corresponding to the appropriate hard drive):
<userinput>fdisk -l /dev/sda</userinput>
The <quote>Type</quote> column of the ESP should be <literal>EFI System</literal>.
If the system or the hard drive is new, or it's the first installation of a UEFI-booted OS on the system, the ESP may not exist. In that case, install <xref linkend='dosfstools'/> first. Then create a new partition, make a <systemitem class="filesystem">vfat</systemitem> file system on it, and set the partition type to <quote>EFI system</quote>. See the instructions for the emergency boot device above as a reference.
Some (old) UEFI implementations may require the ESP to be the first partition on the disk.
Now, as the <systemitem class="username">root</systemitem> user, create the mount point for the ESP, and mount it (replace <userinput>sda1</userinput> with the device node corresponding to the ESP):
<userinput>mount --mkdir -v -t vfat /dev/sda1 -o codepage=437,iocharset=iso8859-1 \
/boot/efi</userinput>

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Source string added

  1. Beyond Linux From Scratch
  2. postlfs_filesystems_uefi-bootloaders_grub-setup
  3. English
<userinput>fdisk /dev/sdx</userinput>
<literal>
Welcome to fdisk (util-linux 2.39.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): </literal><userinput>t</userinput>
<literal>Partition number (1-9, default 9): </literal><userinput>1</userinput>
<literal>Partition type or alias (type L to list all): </literal><userinput>uefi</userinput>
<literal>Changed type of partition 'Linux filesystem' to 'EFI System'.

Command (m for help): </literal><userinput>w</userinput>
<literal>The partition table has been altered.
Syncing disks.</literal>
8 months ago
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String information

Source string description
type: Content of: <sect1><sect2><screen>
Flags
no-wrap, read-only, xml-text
Source string location
blfs-en/postlfs/filesystems/uefi-bootloaders/grub-setup.xml:107
String age
8 months ago
Last updated
8 months ago
Source string age
8 months ago
Translation file
string 17