feature(pi3): set boot configuration limit

flake.lock

@@ -197,11 +197,11 @@
     },
     "nixpkgsUnstable": {
       "locked": {
-        "lastModified": 1722630782,
-        "narHash": "sha256-hMyG9/WlUi0Ho9VkRrrez7SeNlDzLxalm9FwY7n/Noo=",
+        "lastModified": 1725103162,
+        "narHash": "sha256-Ym04C5+qovuQDYL/rKWSR+WESseQBbNAe5DsXNx5trY=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d04953086551086b44b6f3c6b7eeb26294f207da",
+        "rev": "12228ff1752d7b7624a54e9c1af4b222b3c1073b",
         "type": "github"
       },
       "original": {
@@ -213,11 +213,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1723938990,
-        "narHash": "sha256-9tUadhnZQbWIiYVXH8ncfGXGvkNq3Hag4RCBEMUk7MI=",
+        "lastModified": 1725826545,
+        "narHash": "sha256-L64N1rpLlXdc94H+F6scnrbuEu+utC03cDDVvvJGOME=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "c42fcfbdfeae23e68fc520f9182dde9f38ad1890",
+        "rev": "f4c846aee8e1e29062aa8514d5e0ab270f4ec2f9",
         "type": "github"
       },
       "original": {

hardware/raspberry_pi_3_model_B.nix

@@ -24,6 +24,7 @@
     loader = {
       generic-extlinux-compatible = {
         enable = true; # Enables the generation of /boot/extlinux/extlinux.conf
+        configurationLimit = 5;
       };
       grub = {
         enable = false; # NixOS wants to enable GRUB by default.