corenix: update uwu coreboot configuration

This changes the default boot payload to grub, which then loads
secondary payloads, or can boot NixOS directly.  Also include a better
boot splash screen.

infra/corenix/configs/kookie/uwu.nix

@@ -5,16 +5,27 @@
 
   grub2 = {
     enable = true;
-    extraPayloadModules = [ "luks" "crypto" "gcry_sha256"
-                            "gcry_rijndael" "pbkdf2" ];
+    extraPayloadModules = [ "luks" "crypto" "gcry_sha256" "lvm"
+                            "gcry_rijndael" "pbkdf2" "jpeg" ];
     extraConfig = ''
+      set timeout=10
+
       menuentry "NixOS" {
-        cryptomount -u f1440abd-99e3-46a8-aa36-7824972fee54
-        search --set=cryptdrive --fs-uuid 672c497c-18aa-4b00-ac95-78e810363d81
-        configfile ($cryptdrive)/grub/grub.cfg
+        insmod luks
+        insmod crypto
+        insmod gcry_sha256
+        insmod gcry_rijndael
+        insmod pbkdf2
+        insmod lvm
+
+        cryptomount -a
+        configfile (lvm/vg0-boot)/grub/grub.cfg
       }
     '';
   };
+
+  tint.enable = true;
+  nvramcui.enable = true;
   
   seabios = {
     enable = true;
@@ -27,6 +38,6 @@
       CONFIG_LINEAR_FRAMEBUFFER_MAX_HEIGHT = "768";
     };
     
-    extraFiles."background.jpg".src = lib.mkForce ./splash.jpg;
+    extraFiles."background.png".src = lib.mkForce ./splash.png;
   };
 }

infra/corenix/default.nix

@@ -31,4 +31,5 @@ in rec {
   milan-x1c = makeDevice ./configs/milan/milan-x1c.nix;
   milan-x230t = makeDevice ./configs/milan/milan-x230t.nix;
   milan-x230-fhd = makeDevice ./configs/milan/milan-x230-fhd.nix;
+  kookie-uwu = makeDevice ./configs/kookie/uwu.nix;
 }