On 7/4/24 11:37, Tim via users wrote:
If you install other OSs, they should do something similar. You'd have
something like:
... EFI/debian
... EFI/fedora
Which should keep all the OSs separate from each other.
If you wanted dual booting different versions of Fedora, without one
stomping on the others files, it might be worth naming the directories
more uniquely. I'm not sure if there's any straightforward way to do
that.
e.g. ... EFI/fedora39
... EFI/fedora40
At first I thought something similar but that the 36, 40, etc would be
subdirs of fedora. Not so...
After some (a lot) searching I found bits that help understand what is
going on. The efi spec is not helpful in describing the EFI structure
but is more about the byte/bit layout of the motherboard's NVRAM.
/boot/efi/EFI contains vendor directories and one generic called boot.
Names are case insensitive. I've seen MICROSOFT, fedora, Fedora,
Debian, debian, DEBIAN, boot, BOOT, and so on.
Within each of the vendor directories there are efi binaries, and a
bootx64.csv which tersely describes what is there. E.g. here's one for
debian:
shimx64.efi,debian,,This is the boot entry for debian
Lastly, there is a config file specific to what each vendor uses. Most
of the linux distros use grub so for those you will find grub.cfg.
Whenever a vendor's product is installed successfully the system runs
the os-prober and rebuilds, in our case, the grub.cfg, with menuentries
for each that it finds. That is how multiple version co-exist: not as
entries in EFI but as entries in the appropriate config file.
There are a couple of levels in the boot process. First one is the BIOS
which offers different devices, then proceeds to the loader that handles
the selected device, which then runs that loader. That is the one that
offers e.g. fedora36, fedora40, etc.
--
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