Re: Lost the UEFI boot info that my BIOS shows

[Fulko Hew <fulko.hew@xxxxxxxxx>]

On Sun, Nov 29, 2020 at 8:23 AM Jorge Fábregas <jorge.fabregas@xxxxxxxxx> wrote:

On 11/28/20 11:48 PM, Fulko Hew wrote:
>
> 'DEVNAME': '/dev/sda1',
> 'DEVPATH':
> '/devices/pci0000:00/0000:00:17.0/ata1/host0/target0:0:0/0:0:0:0/block/sda/sda1',
> 'ID_FS_TYPE': 'vfat',
> 'ID_PART_ENTRY_NAME': 'EFI\\x20System\\x20Partition',
> 'ID_PART_ENTRY_NUMBER': '1',
> 'ID_PART_ENTRY_OFFSET': '2048',
> 'ID_PART_ENTRY_SCHEME': 'gpt',
> 'ID_PART_ENTRY_SIZE': '409600',
> 'ID_PART_ENTRY_TYPE': 'c12a7328-f81f-11d2-ba4b-00a0c93ec93b',
> 'ID_PART_ENTRY_UUID': 'bf2ce45d-8dc0-4e11-869e-ec2e3e747ed3',
> 'ID_PART_TABLE_TYPE': 'gpt',
> 'ID_PART_TABLE_UUID': '1b5b5ada-1a00-40dc-b1b7-7b81b9a71ff1',

OK this is the EFI System Partition  (ESP).  You could simply create the
entry with:

efibootmgr -c -w -L Fedora -d /dev/sda -p 1 -l '\EFI\fedora\shimx64.efi'

Confirm with "efibootmgr -v"

The thing is that your UEFI firmware should at least pick up the
fallback bootloader located at:

/boot/efi/EFI/BOOT/BOOTX64.EFI

...and present you that within the menu (as something like "UEFI OS"
etc).  Anyway the mentioned efibootmgr line should bring you back the
Fedora entry.

Yes, that brought back an entry, but it booted right into the

Dell maintenance application.  For laughs I changed the statement

to point to partition 2 (the ext4 partition) and tried again.

It went to the maintenance app again.

The ext4 partition appears to be my boot partition.  It contains

the following.  I looked because I was looking to find /boot/efi/EFI/BOOT/BOOTX64.EFI

somewhere.  It's not in that partition/fs

So I also tried to mount sda1 that you mentioned, but that just hung the mount command

with an eventual "Can't read superblock on /dev/sda1".

Have I reached a dead end, and am stuck with a re-install now?

# ls -R /mnt
/mnt:
config-4.15.17-200.fc26.x86_64                           initramfs-4.16.7-100.fc26.x86_64.img
config-4.16.11-100.fc26.x86_64                           lost+found
config-4.16.7-100.fc26.x86_64                            memtest86+-5.01
efi                                                      System.map-4.15.17-200.fc26.x86_64
elf-memtest86+-5.01                                      System.map-4.16.11-100.fc26.x86_64
extlinux                                                 System.map-4.16.7-100.fc26.x86_64
grub2                                                    vmlinuz-0-rescue-7e2a43f9b2494d79a3cfbfb2b3512518
initramfs-0-rescue-7e2a43f9b2494d79a3cfbfb2b3512518.img  vmlinuz-4.15.17-200.fc26.x86_64
initramfs-4.15.17-200.fc26.x86_64.img                    vmlinuz-4.16.11-100.fc26.x86_64
initramfs-4.16.11-100.fc26.x86_64.img                    vmlinuz-4.16.7-100.fc26.x86_64

/mnt/efi:

/mnt/extlinux:
cat.c32     cpuid.c32      dmitest.c32   host.c32         ldlinux.c32   linux.c32    pci.c32       reboot.c32    vesainfo.c32
chain.c32   cpuidtest.c32  elf.c32       ifcpu64.c32      lfs.c32       ls.c32       pcitest.c32   rosh.c32      vesamenu.c32
cmd.c32     debug.c32      ethersel.c32  ifcpu.c32        libcom32.c32  lua.c32      pmload.c32    sanboot.c32   vpdtest.c32
cmenu.c32   dhcp.c32       gfxboot.c32   ifmemdsk.c32     libgpl.c32    mboot.c32    poweroff.c32  sdi.c32       whichsys.c32
config.c32  dir.c32        gpxecmd.c32   ifplop.c32       liblua.c32    memdisk      prdhcp.c32    sysdump.c32   zzjson.c32
cptime.c32  disk.c32       hdt.c32       kbdmap.c32       libmenu.c32   meminfo.c32  pwd.c32       syslinux.c32
cpu.c32     dmi.c32        hexdump.c32   kontron_wdt.c32  libutil.c32   menu.c32     pxechn.c32    vesa.c32

/mnt/grub2:
grub.cfg  grubenv  themes

/mnt/grub2/themes:
system

/mnt/grub2/themes/system:
background.png  fireworks.png

/mnt/lost+found:

there

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