GRUB-EFI: os-prober-efi

GRUB 2 works with EFI but there are no menuentries built, os-prober-efi/30_os_prober_efi will fix this.

os-prober-efi ist for analyzing/printing the EFI environment. Use os-prober-efi -h for more informations!
30_os_prober_efi ist the grub-mkconfig script (update-grub) and generates for each entry (*.efi) found in /boot/efi/EFI/... a menuentry.
You can disable them in "/etc/default/grub".

NOTE: /boot/efi/EFI/Microsoft/Boot/bootmgfw.efi is the regular EFI-Loader for Windows!

Possible Variables (optional) - they need export and must be stored in "/etc/default/grub":
export GRUB_DISABLE_OS_PROBER_EFI=true
-- Disable the script 30_os_prober_efi
export GRUB_DISABLE_EFI_directory_loader=true
-- Disable directory and/or loader (first found=disabled)

Example for disable the loader /EFI/Microsoft/Boot/bootmgr.efi:
export GRUB_DISABLE_EFI_MICROSOFT_BOOT_BOOTMGR.EFI=true

Example for disable the complete folder boot/efi/EFI/grub:
export GRUB_DISABLE_EFI_GRUB=true