this post was submitted on 11 Aug 2023
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UEFI forum made it a requirement for motherboard constructors (hp, dell, msi...) to make their UEFI implementation to be able to at least read fat(12/16/32) filesystems. That is why you need a fat(12/16/32) partition flagged ESP (efi system partition) for holding your boot files.
So, I dont think you can do that unless you fall back to the old outdated BIOS or you have some *nix filesystem in your uefi implementation which I dont trust.
You're only partially correct.
/bootdoesn't have to also be your EFI partition. In fact, most distros by default will separate the two, with the EFI partition mounted at/boot/efiand/bootbeing a separateext4based partition. My suggestion is that, if you're running BTRFS, you should merge/bootand/as one partition. You're still free to have a FAT32-based EFI mounted at/boot/efior better yet/efi.I use systemd-boot and my mount point is /efi. /efi/EFI/ is where my bootloaders live.
If I rollback to an old enough snapshot, I have to reinstall my kernels from a chroot. It'd be cool if I could get around that.
Where's your /boot?
Separate FAT32 part.
It has been a while since I used grub that I forgot tgat esp could only be used to hold the boot files residing on /boot/efi.
I am guessing you're on systemd-boot? Yeah, one of the reasons why I hesitate to use it is how it requires EFI contain the kernel images. I am currently using refind.
Yeah, I'm on systemd-boot, it requires the kernel to be located in the ESP partition which I mount in /boot, resulting in cleaner setup.