On 09/06/2020 12:07, Peter Humphrey wrote: > On Tuesday, 9 June 2020 15:56:52 BST Peter Humphrey wrote: > # cat /boot/loader/entries/30-gentoo-5.7.1.conf > title Gentoo Linux 5.7.1initrd=/intel-uc.img > linux /vmlinuz-5.7.1-gentoo > options root=/dev/nvme0n1p4 initrd=/intel-uc.img net.ifnames=0 > raid=noautodetect
Since you are using systemd-boot or something that fulfils that
specification[1], you can also build your kernel with EFI stub enabled
(CONFIG_EFI_STUB) and then simply put the binary in:
${ESP}/EFI/Linux/vmlinuz-5.7.1-gentoo.efi
You can then run `bootctl set-default vmlinuz-5.7.1-gentoo.efi` or on
the menu, select it and press d to set it within systemd-boot.
(My ASUS motherboard for some reason never lets me write EFI variables
from within Linux so I have to do it from within systemd-boot.)
You can specify the options in the kernel configuration as well:
CONFIG_CMDLINE="root=/dev/nvme0n1p4 initrd=/intel-uc.img net.ifnames=0
raid=noautodetect"
To add the /intel-uc.img to this configuration you either have to
include that in kernel configuration or you can use Dracut to build an
EFI image.
Kernel config:
CONFIG_INITRAMFS_SOURCE="/boot/intel_uc.img"
Or with Dracut:
dracut --force --uefi --uefi-stub
'/usr/lib/systemd/boot/efi/linuxx64.efi.stub' ...
Dracut will automatically pick up your kernel installed to /boot (from
kernel `make install`) and /boot/intel-uc.img (and other similar
things). It will also automatically place the file into
In both cases, you have to remember to update the EFI image/rebuild and
reinstall the kernel whenever you update intel-microcode.
The benefit to this is you don't have to maintain entries files, and you
keep configuration generally in one place: the kernel config. Then you
just drop in EFI binaries into the correct place and they will appear in
the menu. You could have always keep two Linux EFI binaries in
${ESP}/EFI/Linux/ in case the newest one fails.
If you want to do this semi-automatically as part of updates and with
UEFI secure boot signing, use my project: https://github.com/tatsh/upkeep
[1] https://systemd.io/BOOT_LOADER_SPECIFICATION/
--
Andrew
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