Dual Booting NixOS and Windows: Difference between revisions

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 === systemd-boot ===
-If <code>\EFI\Microsoft\Boot\bootmgfw.efi</code> is detected on the EFI System Partition (ESP), it will be loaded by systemd-boot automatically.
+When {{ic|systemd-boot}} is installed to the same EFI System Partition (ESP) that Windows uses, it will automatically detect the Windows installation ({{ic|/EFI/Microsoft/Boot/bootmgfw.efi}}) and present it as a boot option.
-Therefore, on EFI systems, it may be simplest to resize the existing ESP to at least 500 megabytes, and share that ESP for NixOS.
+You can verify detected boot loaders by running the {{ic|bootctl}} command.
+A system pre-installed with Windows might have a small ESP partition size that is not sufficient to store the kernel and initrd files for multiple NixOS generations. One solution is to create an additional [https://uapi-group.org/specifications/specs/boot_loader_specification/#the-partitions XBOOTLDR] partition and configure {{ic|systemd-boot}} to use it:
+{{File|/etc/nixos/configuration.nix|nix|<nowiki>
+{
+  fileSystems."/boot" =
+    { device = "/dev/disk/by-uuid/57D4-A2B2";
+      fsType = "vfat";
+    };
+  fileSystems."/efi" =
+    { device = "/dev/disk/by-uuid/3280-5418";
+      fsType = "vfat";
+    };
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+  boot.loader.efi.efiSysMountPoint = "/efi";
+  boot.loader.systemd-boot.xbootldrMountPoint = "/boot";
+}
+</nowiki>}}
 === os-prober ===
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 ==== Grub ====
-<nowiki>systemd-boot</nowiki> can not load EFI binaries from other partitions,
-and a pre-existing EFI partition from a Windows install may be smaller than we would like our <nowiki>/boot</nowiki> partition to be. If we still want Windows and NixOS to use the same EFI partition, we can use GRUB instead.
 Here we assume: