On 9/21/2023 5:53 PM, Wolfgang Pfeiffer wrote:
On Wed, Sep 20, 2023 at 09:02:42AM +0100, Barry wrote:
On 20 Sep 2023, at 01:41, Bill Cunningham <bill.cu1234@xxxxxxxxx>
wrote:
I had to reinstall my windows system which is fine it takes
care of itself. But, I have to install my entire fedora system from
scratch. Is there a way to simply reinstall the boot loader code
without having to install from scratch with a UEFI system? I'm sure
there is but I don't know about it. There's also a command called
"efibootmgr" is this what I am looking for? AFAIK fedora doesn't
install more partitions but just code in the /boot/efi partition.
How can I reinstall or repair boot loader code without touching the
system? Without having to reinstalling from scratch?
In my notes I saved this command for fixing fedora booting on one of
my systems.
(I had a system that would fill its EFI variable space and need a
full reset)
efibootmgr --create --disk /dev/md126 --part 2 --loader
/EFI/fedora/shim.efi --label Fedora
In this case /dev/md126 is my raided fedora disk, replace with your
disk.
/dev/md126p2 - VFAT - EFI
Partition 2 is what is mounted on /boot/EFI, change the 2 as needed.
From my notes :) .. :
-----
add a boot entry:
efibootmgr -c -d /dev/sdb -p 1 -w -L Debian -l "\EFI\debian\grubx64.efi"
-----
If I recall correctly:
This command above was done a machine where /dev/sdb was a disk where
Debian was already installed. The 'man' page should explain the rest
of the options.
see:
https://wiki.debian.org/UEFI#efibootmgr_example_3_-_add_a_new_boot_entry
At the end of "man efibootmgr" you should find an example for a Fedora
install - it says "The default OS Loader is \EFI\fedora\grub.efi"
But that looks wrong to me. My guess would be that this should say for
a nowadays Fedora install probably:
"\EFI\fedora\shim.efi"
The latter at least was what I saw with a quick Internet search and
the output from entering "efibootmgr" on my own Fedora install here.
Excerpt:
[ ....]
Boot0002* Fedora HD(1,GPT,[..])/File(\EFI\fedora\shim.efi)
[ .... ]
See the "\EFI\fedora\shim.efi" section above..
I'd simply take some Live system on a thumb, boot it, and then have a
look at the output of
# efibootmgr
and proceed with that info ...
Good luck!
Wolfgang
What I would like to do for example, is if I removed a Windows OS, for
example, the partition data (for fedora) would need to be reset. Say I
reinstalled the system (windows). I believe that windows could take care
of itself but I am going to have an unbootable fedora there.
Am I going to need to remove some data and let the system create a
new UUID? That's exactly what I am running into. Needing to re enter
boot code to rescue a fedora system. That would be done with a thumb
drive. And efibootmgr would be an option in fixing boot loading. Simply
removing the "fedora" directory in 'Boot/efi' might clean things but
something is going to be re-written.
I will look into all this. TO be clear rescuing a fedora system is what
I want to do.
B
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