From 2c8e0201f0bb2a274b83533919bd22d6420b83bb Mon Sep 17 00:00:00 2001
From: Hermes-Neo <hermes-neo@noreply.localhost>
Date: Sat, 18 Jul 2026 03:25:28 +0100
Subject: [PATCH] fix: add GRUB efiInstallAsRemovable as fallback bootloader

---
 modules/common/system.nix | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/modules/common/system.nix b/modules/common/system.nix
index 4612399..d3bccd3 100644
--- a/modules/common/system.nix
+++ b/modules/common/system.nix
@@ -3,8 +3,19 @@
 {
   system.stateVersion = "25.11";
 
-  boot.loader.systemd-boot.enable = true;
-  boot.loader.efi.canTouchEfiVariables = true;
+  # Try UEFI first, fall back to GRUB for legacy BIOS
+  boot.loader = {
+    systemd-boot.enable = true;
+    efi.canTouchEfiVariables = true;
+
+    # GRUB as fallback for legacy/CSM boot
+    grub = {
+      enable = true;
+      device = "nodev";
+      efiSupport = true;
+      efiInstallAsRemovable = true;
+    };
+  };
 
   services.xserver.xkb.layout = "uk";
 }