Re: efibootmgr?

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On Sun, Sep 9, 2018 at 6:32 AM, Tom Horsley <horsley1953@xxxxxxxxx> wrote:
> On Sat, 8 Sep 2018 20:43:46 -0600
> Chris Murphy wrote:
>
>> Nope. There's no firmware state information saved to disk.
>
> There must be something on disk, because I keep
> reading web pages that say things like:
>
> You can create a new image file and add it to the
> efi menu with efibootmgr (without, of course,
> ever having an example :-).

Example from an old anaconda/program.log

15:12:07,059 INFO program: Running... efibootmgr -c -w -L Fedora -d
/dev/md/Volume0_0 -p 1 -l \EFI\fedora\shim.efi

That gets translated by efibootmgr/efivars into an NVRAM boot entry.
But this is for making it persistent. It has nothing to do with
sticks. Sticks should have their bootloader in EFI/BOOT/BOOT<arch>.EFI
where <arch> is X64 on x86_64 systems, and IA32 for 32-bit UEFI
systems, and so on. The firmware has rules for the order it looks for
a valid OS Loader, that are in the UEFI spec. But the gist is that if
you plug in a stick you have to tell the firmware you want to boot off
the stick, and the way you do that is choosing that stick from a menu.
And then it knows to look in EFI/BOOT and then what arch EFI file it
should read and execute.


-- 
Chris Murphy
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