[SOLVED] How do I set up a EFI Stub kernel with initrd using efibootmgr?

interested_penguin · 12-04-2016, 11:50 PM

So currently I want to switch a computer to the generic Kernel.But it can only boot trough UEFI and I don't have physical access to it.So I must edit to boot directly into the generic kernel with the initrd.gz.I can't seem to find information regarding this for Slackware.So how would I go about setting this up?

bassmadrigal · 12-05-2016, 05:24 PM

I think it is done via eliloconfig, but I don't have any machines booting off UEFI, so I'm not very familiar with it.

You might also need to transfer the generic kernel to some directory under /boot/EFI/, but I can't remember what.

laprjns · 12-05-2016, 08:07 PM

You can use efibootmgr. Assuming that you have the generic kernel and initrd in a directory called "Slackware" on the ESP partition (usually sda1) and again assuming for example that your root file system is on sda3, the command would look something like this:

# efibootmgr -d /dev/sda -p 1 -c -L "Slackware" -l \\EFI\Slackware\\kernel-generic -u "root=/dev/sda3 rw initrd=/EFI/Slackware/initrd.gz"

Obviously you will need to make changes to this based on your particular partitioning scheme.

interested_penguin · 12-06-2016, 06:46 AM

Quote:

Originally Posted by laprjns

You can use efibootmgr. Assuming that you have the generic kernel and initrd in a directory called "Slackware" on the ESP partition (usually sda1) and again assuming for example that your root file system is on sda3, the command would look something like this:

# efibootmgr -d /dev/sda -p 1 -c -L "Slackware" -l \\EFI\Slackware\\kernel-generic -u "root=/dev/sdZ rw initrd=/EFI/Slackware/initrd.gz"

Obviously you will need to make changes to this based on your particular partitioning scheme.

Thanks!Just did that.

aragorn2101 · 12-10-2016, 04:21 AM

Hi,

May I suggest you use a boot loader like GRUB. It gives you much more flexibility. You can multi-boot and in case you upgrade a kernel or want to try a new kernel version or a custom built kernel, it is very easy to add an entry to the boot loader.

Also, with a boot loader, you use the efibootmgr command just once, only to register the GRUB EFI binary into the UEFI firmware settings, then you play with the boot loader's menu and options as you please.

colorpurple21859 · 12-10-2016, 09:44 AM

"Grub_install -- target-x86_64_efi /dev/sda" then copy the grubx64.efi to EFI/BOOT/bootx64.efi this works for has worked for me from both a bios and efi system to allow to boot from efi system

AlleyTrotter · 12-10-2016, 01:58 PM

Quote:

Originally Posted by aragorn2101

Hi,

May I suggest you use a boot loader like GRUB. It gives you much more flexibility. You can multi-boot and in case you upgrade a kernel or want to try a new kernel version or a custom built kernel, it is very easy to add an entry to the boot loader.

Also, with a boot loader, you use the efibootmgr command just once, only to register the GRUB EFI binary into the UEFI firmware settings, then you play with the boot loader's menu and options as you please.

You can do all these things with elilo