Bootloader: Difference between revisions

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=== ~~How to deal~~ with ~~full /boot in case of EFI~~ ===

=== Limiting amount of entries with grub ===

~~systemd-~~boot ~~(gummiboot) can't store~~ kernels, initrd ~~and other big stuff~~ on root partition, ~~so switch to grub~~

The grub module has an option to limit the number of configurations made available in the boot partition, {{nixos:option|boot.loader.grub.configurationLimit}}. Setting this to a lower amount than the default may help reduce the occasions where too many different kernels and initrds are added to the <tt>/boot</tt> partition or <tt>ESP</tt>.

=== Keeping kernels/initrd on the main partition ===

For these instructions, GRUB will be required; systemd-boot cannot reference boot files from the root partition. This will differ from the default expectation of NixOS on EFI, where <tt>/boot/</tt> is the <tt>ESP</tt>.

{{file|/etc/nixos/hardware-configuration.nix|nix|<nowiki>

fileSystems."/boot/efi" = ...

fileSystems."/boot/efi" = ... # ← mount your ESP here instead of at /boot/.

</nowiki>}}

{{file|/etc/nixos/configuration.nix|nix|<nowiki>

boot.loader = {

efi = {

canTouchEfiVariables = true;

efiSysMountPoint = "/boot/efi";

efiSysMountPoint = "/boot/efi"; # ← use the same mount point here.

};

grub = {

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};

</nowiki>}}

~~=== Limiting amount of entries with grub ===~~

The grub module has an option to limit the number of configurations made available in the boot partition, {{nixos:option|boot.loader.grub.configurationLimit}}. Setting this to a lower amount than the default may help reduce the occasions where too many different kernels and initrds are added to the <tt>/boot</tt> partition or <tt>ESP</tt>.

== Troubleshooting ==