Is there a way to boot Linux on EFI?
In late 2011, Linux kernel developers began work on a new way to boot Linux on EFI-based systems. This approach turns the Linux kernel into an EFI application. Once loaded, the kernel takes over the computer, effectively bypassing the need for a boot loader in the strictest sense.
How to boot load the kernel using EFI STUB?
(You can change the label to anything you want by changing the -L parameter.) The boot entry you just added will become the default entry. And it won’t break after a kernel update, since the hook will make sure vmlinuz and initrd.img are always updated.
Is there a way to copy the kernel to the ESP?
It makes it simple to copy the current kernel and initramfs image onto the ESP so that they are automatically probable by most EFI boot loaders as well as the EFI firmware itself. It can also set up the system’s NVRAM to add entries to the firmware boot menu for the kernel (and keep these options up to date when new kernel versions are installed).
Why does yum update kernel not boot into new kernel?
Also, the file ‘/etc/grub.cfg’ is a symbolic link to ‘/boot/grub2/grub.cfg’ file (in case of EFI based systems /boot/efi/EFI/redhat/grub.cfg). Looking at your problem description I presume that system boots into older kernel without any issues. If this is the case then it could be due to the reason that ‘/etc/grub.cfg’ symbolic link file not there.
How are arguments passed to the kernel in EFI?
Arguments to the kernel can be passed after bzImage.efi, e.g.: Like most boot loaders, the EFI stub allows the user to specify multiple initrd files using the “initrd=” option. This is the only EFI stub-specific command line parameter, everything else is passed to the kernel when it boots.
Can a kernel masquerade as an EFI executable?
On the x86 and ARM platforms, a kernel zImage/bzImage can masquerade as a PE/COFF image, thereby convincing EFI firmware loaders to load it as an EFI executable.