My system has two efi boot partitions on separate drives. I rarely
boot to Windows and I wanted it on its own completely separate
drive. I configured a default in the firmware settings and then for a
while I would choose an alternate when I needed to by hitting a key to
bring up the efi boot menu. Eventually I got around to adding a boot
entry for my second (WIndows) drive to grub on the main drive and now I
can just select Windows from grub if I need to boot into it.
On Mon, 2020-06-01 at 20:13 +0200, Patrick Dupre wrote:
Hello,
I guess that very think is more or less, OK, I have just some
difficultiesto 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 sdaBy
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 -0400Jonathan 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
> > theUUID 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
> > ofthe EFI volume matches the UUID in the above EFI entry.
> > You can have an EFI volume on multiple disks. EFI also
> > supportsthings like network boot, which has a different syntax
> > EFI entry. Theefibootmgr command does a lot of the hard work of
> > figuring that outfor you, so you don't need to manually enter
> > that information.
> You seem knowledgeable, so I'll ask you. How does the efi
> firmwaredecide which /boot/efi to use as the source when the
> computer isstarted? Does it have to be selected from the efi
> firmware menu ateach
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