On Thu, 6 Jan 2022 at 14:13, stan via users <users@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
On Wed, 5 Jan 2022 21:25:10 -0500
Tom Horsley <horsley1953@xxxxxxxxx> wrote:
> On Wed, 5 Jan 2022 21:12:04 -0500
> Robert Moskowitz wrote:
>
> > that sounds interesting, but don't you also need separate /
> > partitions with all the release specific software?
>
> Yep. My actual scheme has a tiny grub2 stand alone partition
> which uses the "configfile" grub command to be able to boot
> one or the other. I install by installing inside a KVM virtual
> machine from the DVD image, then use guestmount and rsync to copy
> the virtual image to the partion I want it in. Edit a few places
> that refer to UUIDs and I can boot it in the new location. The
> / partition is setup with /boot under it, so the KVM install
> is just to /, no other partitions created.
>
> I have no idea if this scheme could work under EFI, bur it works
> great with old DOS BIOS.
It doesn't work with EFI, because EFI only allows a single version of
any OS; so only a single fedora version. Systemd-boot *does* allow
booting multiple versions of an OS, but *only* EFI.
It can be made to work under EFI by running mkconfig in the EFI
version, and then booting the legacy versions via the EFI menu. Clumsy
for updating kernels, since mkconfig has to be run in both versions
of the OS in order for the EFI mkconfig to pick the changes up.
For UEFI you can have the old OS on an external drive. The main
annoyance on my system is that when you use the "BIOS" option to
select a boot device you get "Fedora" twice with no indication
of which entry is the external drive.
--
George N. White III
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