On Thu, 6 Jan 2022 at 14:13, stan via users <users@lists.fedoraproject.org> wrote:
> On Wed, 5 Jan 2022 21:25:10 -0500 > Tom Horsley <horsley1...@gmail.com> 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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