Re: I need Dual Legacy EFI help

[ToddAndMargo]

On 5/13/19 8:43 AM, Pascal Hambourg wrote:
> Sorry for the late answer.
>
> Le 05/05/2019 à 11:11, ToddAndMargo a écrit :
> > I have a Fedora 30 flash drive set up for dual booting
> > from Legacy or UEFI.  It need to be able to boot from any
> > and all computers.
> (...)
> > Remaking grub.cfg, I get
> >
> >     # grub2-mkconfig -o /boot/grub2/grub.cfg
> >     Generating grub configuration file ...
> >     Adding boot menu entry for EFI firmware configuration
> >     done
> >
> > Uhhhhh.. I wanted legacy, not EFI.
>
> It should not matter. In Debian, grub.cfg files generated in legacy and 
> EFI mode are very similar (at least for Linux boot entries).
>
> Are there major differences in Fedora ?
>
> > How do I trick grub2-mkconfig to make me a Legacy boot
> > when I am booted into EFI?
>
> You can try to boot with the "noefi" kernel parameter.
> Or unmount pstore and efivar filesystems and unload efi kernel modules.

Hi Pascal,

This is a change from Fedroa 29 to 30.  "grub2-mkconfig" now hunts
down what type of boot you have and generates a grub.cfg
accordingly.

Now if I could boot from legacy, I could generate a legacy
grub.cfg, but since it won't boot into legacy, I am stuck.

What I am thinking of doing is booting legacy off a Live ISO
and then doing the chroot thing.  grub2-mkconfig will then
see legacy and generate appropriately.

If it works, the only draw back is that it will need to be
done after every kernel update.  Be nice if I could somehow
trick grub2-mkconfig.

But on the bright side, if I ever have to restore a system
from dump, I will know how to also restore grub.

Thank you for the help!
-T