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8.4.1. Introduction
Warning
Configuring GRUB incorrectly can render your system inoperable without an alternate boot device such as a CD-ROM. This section is not required to boot your LFS system. You may just want to modify your current boot loader, e.g. Grub-Legacy, GRUB2, or LILO.
Warning
Configuring GRUB incorrectly can render your system inoperable without an alternate boot device such as a CD-ROM. This section is not required to boot your LFS system. You may just want to modify your current boot loader, e.g. Grub-Legacy, GRUB2, or LILO.
Ensure that an emergency boot disk is ready to “rescue” the computer if the computer becomes unusable (un-bootable). If you do not already have a boot device, you can create one. In order for the procedure below to work, you need to jump ahead to BLFS and install xorriso from the libisoburn package.
cd /tmp
grub-mkrescue --output=grub-img.iso
xorriso -as cdrecord -v dev=/dev/cdrw blank=as_needed grub-img.iso
cd /tmp
grub-mkrescue --output=grub-img.iso
xorriso -as cdrecord -v dev=/dev/cdrw blank=as_needed grub-img.iso
Note
To boot LFS on host systems that have UEFI enabled, the kernel needs to have been built with the CONFIG_EFI_STUB capabality described in the previous section. However, LFS can be booted using GRUB2 without such an addition. To do this, the UEFI Mode and Secure Boot capabilities in the host system's BIOS need to be turned off. For details, see the lfs-uefi.txt hint at http://www.linuxfromscratch.org/hints/ downloads/files/lfs-uefi.txt.
Note
To boot LFS on host systems that have UEFI enabled, the kernel needs to have been built with the CONFIG_EFI_STUB capabality described in the previous section. However, LFS can be booted using GRUB2 without such an addition. To do this, the UEFI Mode and Secure Boot capabilities in the host system's BIOS need to be turned off. For details, see the lfs-uefi.txt hint at http://www.linuxfromscratch.org/hints/ downloads/files/lfs-uefi.txt.
