On Tue, 31 Aug 2021 20:44:50 +0100, Michael wrote: > > systemd-boot and refind both support everything on EFI. I am pretty > > sure GRUB does too, but I have no reason to use GRUB with EFI. My > > setup on this box is /boot on FAT32 and / (and everything else) on > > btrfs. I've also used the same setup with ZFS. > > Any boot option on a UEFI MoBo requires an 'EFI System Partition' > (ESP), formatted as VFAT. The UEFI firmware boot loader will > list/load/run any *.efi software stored in the ESP compatible with the > UEFI API, whether this is a boot loader, a kernel with an EFI stub, or > some .efi diagnostic application. > > As long as your boot loader of choice, or kernel image and any initrd > contains the requisite fs drivers, there will be no problem mounting > and accessing whatever root fs needs to be accessed. > > GRUB contains a number of ZFS modules to do this job (zfscrypt.mod, > zfsinfo.mod, zfs.mod) - not sure about the other boot managers. > > Typical GRUB installations have /boot/efi mounted on the ESP, with the > grubx64.efi image on it, while the rest of the files, vmlinuz symlinks, > etc. are on the root partition. > > Please beware, I have not used zfs to date, only btrfs, so the above > merely reflects my understanding rather than in depth experience of the > difficulty in managing such a setup.
I find it simpler to make /boot a FAT partition, then /boot/efi is the ESP and all boot-related files are on the same filesystem. Like you, I have only used this with btrfs (and ext4 on LVM). I do use ZFS but that system is not EFI. -- Neil Bothwick Theory is when you know everything, but nothing works. Reality is when everything works, but you don't know why. However, usually theory and reality are mixed together : Nothing works, and nobody knows why not.
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