wget https://ftp.gnu.org/gnu/grub/grub-2.04.tar.gz #rm -rf grub-2.04 tar xzf grub-2.04.tar.gz cd grub-2.04/ ./configure --with-platform=efi nice make -j$j make install
ls -lF /usr/local/lib/grub/x86_64-efi/ mkdir /boot/efi/EFI/grub /usr/local/bin/grub-mkimage --format=x86_64-efi --output=/boot/efi/EFI/grub/grub.efi -p "" part_gpt part_msdos fat ext2 normal chain boot configfile linux multiboot xfs all_video #ntfs ntfscomp hfsplus
#modprobe efivars efibootmgr --create --gpt --disk /dev/sda --part 1 --write-signature --label "GRUB2" --loader "\\EFI\\grub\\grub.efi" efibootmgr -v #normal multiboot grub-file --is-x86-multiboot /boot/xen.gz && echo YES #grub-file --is-x86-multiboot /boot/vmlinuz && echo YES #EFI multiboot #grub-file --is-x86-multiboot2 /boot/xen.gz && echo YES #grub-file --is-x86-multiboot2 /boot/vmlinuz && echo YES vi /boot/efi/EFI/grub/grub.cfg insmod all_video
and see Setting up GRUB2
no EFI functions are available
#modprobe efivars efibootmgr EFI variables are not supported on this system.
get the EFI partition
fsck.vfat /dev/sda2 mount /dev/sda2 /mnt/
no need for tweaking the EFI boot manager
mkdir -p /mnt/EFI/boot/ grub-mkimage --format=x86_64-efi --output=/mnt/EFI/boot/BOOTX64.EFI -p "" part_gpt part_msdos fat ext2 normal chain boot configfile linux multiboot xfs all_video
setup
vi /mnt/EFI/boot/grub.cfg ... insmod all_video ... umount /mnt reboot
error: no suitable mode found. booting in blind mode
==> insmod all_video
Re: no suitable video mode found https://lists.gnu.org/archive/html/help-grub/2018-01/msg00009.html
(no error no suitable video mode found https://sourceforge.net/p/g4l/discussion/408763/thread/9b13dddb75/?limit=25
error: no multiboot header found
EFI system partition https://en.wikipedia.org/wiki/EFI_system_partition
Grub2 + EFI from scratch https://www.linuxquestions.org/questions/linux-general-1/grub2-efi-from-scratch-4175426615/
UEFIBooting https://help.ubuntu.com/community/UEFIBooting
Efibootmgr https://wiki.gentoo.org/wiki/Efibootmgr
GRUB2 https://wiki.gentoo.org/wiki/GRUB2#UEFI.2FGPT
Xen EFI https://wiki.xenproject.org/wiki/Xen_EFI
OpenBSD (U)EFI bootloader howto https://blog.jasper.la/openbsd-uefi-bootloader-howto.html
Installing Slackware on UEFI-based hardware https://docs.slackware.com/howtos:slackware_admin:installing_on_uefi_hardware
Linux kernel options for UEFI and ELILO https://docs.slackware.com/howtos:slackware_admin:linux_kernel_options_for_uefi_and_elilo
Multiboot specification https://en.wikipedia.org/wiki/Multiboot_specification
Multiboot https://wiki.osdev.org/Multiboot
Multiboot headers https://intermezzos.github.io/book/first-edition/multiboot-headers.html