![]() ![]() Type and run the next command to select the first drive on your computer: select disk 0. The tool that lets you do that is diskpart so, in Command Prompt, run the following command: diskpart. Now find the EFI executable, for example for Debian: EFI/debian/grub圆4.efi or for Fedora: EFI/fedora/shim圆4-fedora.efi. In order to repair your EFI Bootloader, you’ll first have to mount the EFI System Partition, the one that holds its files. For example, set -boot orderdc to tell QEMU to try the CDROM ( d) first, then the hard drive ( c). Then 'Boot Maintenance Manager' -> 'Boot Options' -> 'Add Boot Option' -> choose Disk with the Efi System Partition. Use -boot options to specify the order that QEMU should look for bootable devices. Once you do a modification to an entry, the options should be expanded and listed in the corresponding entry file in /boot/loader/entries/ (otherwise you will see variables). Start-up the VM and press ESC to get into the OVMF menu. A complete tutorial on changing the boot order in BIOS. Or by simply using the kernel version as the following for the current kernel: grubby -args amd_iommu=on -update-kernel=/boot/vmlinuz-$(uname -r) ![]() ![]() In order to customize a specific entry you can do so by either referencing the index: grubby -args amd_iommu=on -update-kernel 2 For instance, the following will list the meny entry details for the 3rd entry: grubby -info 2 The latter also gives us the corresponding index for each of the entries that can be useful. In order to view all the menu entries, you can use: grubby -info ALL In order to view the default menu entry, you can use: grubby -info DEFAULT (You can see the un-expanded boot entry configuration files located in the /boot/loader/entries/ directory) Grub menu entries in RHEL/CentOS 8 are assembled from various files and scripts so we won't see static entries as was the case for previous versions of the OSes. ![]()
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