[SOLVED] UEFI machine

Olek · 07-28-2016, 06:53 AM

I have dualboot system - Slackware and Windows 10.
After upgrade from Windows 8.1 to Windows 10 I lost my Slackware boot entry in UEFI Bios boot menu.
Probably it's because some years ago Windows 8 installer moved efi partition from /dev/sda1 to /dev/sda2.
Anyway Asrock BIOS don't recognize it.
Below is solution for Slackware64

1. make Slackware64 USB bootstick by README_USB.TXT
2. boot computer from abowe USB - You MUST to choose "UEFI USB boot" from BIOS menu
3. mount Slackware root partition, by example for /dev/sda8 it is

Code:

mount /dev/sda8 /mnt

4. chroot to Slackware root partition

Code:

chroot /mnt

5. mount /proc

Code:

mount /proc

6. load modules

Code:

modprobe efivars

7. exit from chroot

Code:

exit

8. run efibootmgr to add Slackware entry, if your efi partition is /dev/sda2 then it is

Code:

/mnt/usr/sbin/efibootmgr -c -L "Slackware" -l "\EFI\SLACKWARE\ELILO.EFI" -p /dev/sda2

9. reboot system

Code:

reboot

Tadam!

frushiyama · 07-28-2016, 08:26 AM

Hello Olek!
Good to hear that it works, for me UEFI is yet an unknown path.
I will try this on my next setup

.