Re: [gentoo-user] rescue cd for zfs 2.1 or thereabouts

[Rich Freeman]

On Tue, Aug 31, 2021 at 1:51 PM Michael <confabulate@××××××××.com> wrote:
>
> >
> > In a small nutshell, you have a small EFI+boot partition, set to type
> > 'EFI System' and formatted FAT32, then tell grub to use it as an EFI
> > directory when calling grub-install.
>
> In simple(r) systems where you only boot the same OS you can instead use the
> kernel's EFI stub to get the UEFI firmware to load the latest OS kernel
> directly from the ESP, without a 3rd party boot manager:
>
> https://wiki.gentoo.org/wiki/EFI_stub
>
> You'll use the efibootmgr to manage the kernel images stored on ESP, or your
> UEFI configuration menu if it has this functionality.
>
> https://wiki.gentoo.org/wiki/Efibootmgr
>
>
> If you are multibooting frequently and getting into the UEFI boot menu to
> change the boot order or running efibootmgr is too much hassle, then a 3rd
> party boot manager will be useful.  Your choice of GRUB, rEFInd, systemd-boot,
> syslinux, EFI executable image will be installed and loaded/run by the UEFI
> firwmare from the ESP, with which in turn you will select and load your
> desired OS.
>

So, which (if any) of these options supports either:

1. An EFI partition plus /boot on zfs (with no limitations on pool
config, ie it can be a root pool).
2. An EFI partition that contains everything.

If I want to use grub+EFI with a zfs root it sounds like I'd need TWO
boot partitions - an EFI partition (FAT32), and a /boot partition
(anything, but if ZFS it needs to have controlled features).  That
seems even more messy than what I'm doing now.

-- 
Rich