Hello,
I guess that very think is more or less, OK, I have just some difficulties
to understand the logic.
How does the efi firmware decide which /boot/efi to use as the source
when the computer is started
I realized that I have only one EFI System Partition on sda
By default, the system goes to grub, where I can choose the OS.
I do not use the efi options to go there (at least intentionally).
Does it have to be selected from the efi firmware menu at each boot?
I do not think so. As I said, I go directly to the grub menu (by default).
I guess that if I active the efi menu, I could choose other options to boot.
===========================================================================
Patrick DUPRÉ | | email: pdupre(a)gmx.com
Laboratoire interdisciplinaire Carnot de Bourgogne
9 Avenue Alain Savary, BP 47870, 21078 DIJON Cedex FRANCE
Tel: +33 (0)380395988
===========================================================================
>
> On Mon, 1 Jun 2020 10:10:41 -0400
> Jonathan Billings <billings(a)negate.org> wrote:
>
> > If you see in the Fedora entry, it has:
> > HD(3,GPT,a5c3bc11-e83b-48d0-be96-783af37228f1,0x2001800\
> > ,0xfa000)/File(\EFI\FEDORA\GRUBX64.EFI)
> >
> > That means to look for a volume with the 3rd GPT partition, with the
> > UUID of a5c3bc11-e83b-48d0-be96-783af37228f1 (and some other data).
> > On that disk, look for the /EFI/FEDORA/GRUBX64.EFI executable
> > (remember, this is a DOS filesystem so it's case-insensitive).
> >
> > Run 'blkid' on a running system, and you'll see that the PARTUUID
of
> > the EFI volume matches the UUID in the above EFI entry.
> >
> > You can have an EFI volume on multiple disks. EFI also supports
> > things like network boot, which has a different syntax EFI entry. The
> > efibootmgr command does a lot of the hard work of figuring that out
> > for you, so you don't need to manually enter that information.
> >
> You seem knowledgeable, so I'll ask you. How does the efi firmware
> decide which /boot/efi to use as the source when the computer is
> started? Does it have to be selected from the efi firmware menu at
> each boot?
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