From 44030658f2e084c99bfe37ddaca653ce28c11b00 Mon Sep 17 00:00:00 2001
From: OPNA2608 <opna2608@protonmail.com>
Date: Sun, 23 Nov 2025 04:25:43 +0100
Subject: [PATCH] grub2_ieee1275: init at 2.12

---
 pkgs/tools/misc/grub/default.nix | 26 ++++++++++++++++++++++++--
 pkgs/top-level/all-packages.nix  |  4 ++++
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/pkgs/tools/misc/grub/default.nix b/pkgs/tools/misc/grub/default.nix
index 68f3921354a1..4f66c3753500 100644
--- a/pkgs/tools/misc/grub/default.nix
+++ b/pkgs/tools/misc/grub/default.nix
@@ -26,6 +26,7 @@
   runtimeShell,
   zfs ? null,
   efiSupport ? false,
+  ieee1275Support ? false,
   zfsSupport ? false,
   xenSupport ? false,
   xenPvhSupport ? false,
@@ -61,6 +62,11 @@ let
     riscv64-linux.target = "riscv64";
   };
 
+  ieee1275SystemsBuild = {
+    x86_64-linux.target = "i386";
+    powerpc64-linux.target = "powerpc";
+  };
+
   xenSystemsBuild = {
     i686-linux.target = "i386";
     x86_64-linux.target = "x86_64";
@@ -90,8 +96,16 @@ let
 in
 
 assert zfsSupport -> zfs != null;
-assert !(efiSupport && (xenSupport || xenPvhSupport));
-assert !(xenSupport && xenPvhSupport);
+assert lib.asserts.assertMsg (
+  lib.lists.length (
+    lib.lists.filter (x: x) [
+      efiSupport
+      ieee1275Support
+      xenSupport
+      xenPvhSupport
+    ]
+  ) <= 1 # (0 == pc)
+) "Only <= 1 of grub2's platform-related *Support options may be enabled at the same time";
 
 stdenv.mkDerivation rec {
   pname = "grub";
@@ -618,6 +632,10 @@ stdenv.mkDerivation rec {
     "--target=${efiSystemsBuild.${stdenv.hostPlatform.system}.target}"
     "--program-prefix="
   ]
+  ++ lib.optionals ieee1275Support [
+    "--with-platform=ieee1275"
+    "--target=${ieee1275SystemsBuild.${stdenv.hostPlatform.system}.target}"
+  ]
   ++ lib.optionals xenSupport [
     "--with-platform=xen"
     "--target=${xenSystemsBuild.${stdenv.hostPlatform.system}.target}"
@@ -631,6 +649,8 @@ stdenv.mkDerivation rec {
   grubTarget =
     if efiSupport then
       "${efiSystemsInstall.${stdenv.hostPlatform.system}.target}-efi"
+    else if ieee1275Support then
+      "${ieee1275SystemsBuild.${stdenv.hostPlatform.system}.target}-ieee1275"
     else
       lib.optionalString inPCSystems "${pcSystems.${stdenv.hostPlatform.system}.target}-pc";
 
@@ -674,6 +694,8 @@ stdenv.mkDerivation rec {
     platforms =
       if efiSupport then
         lib.attrNames efiSystemsBuild
+      else if ieee1275Support then
+        lib.attrNames ieee1275SystemsBuild
       else if xenSupport then
         lib.attrNames xenSystemsBuild
       else if xenPvhSupport then
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index ce75607dd4eb..0d8d94121672 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -2894,6 +2894,10 @@ with pkgs;
     efiSupport = true;
   };
 
+  grub2_ieee1275 = grub2.override {
+    ieee1275Support = true;
+  };
+
   grub2_light = grub2.override {
     zfsSupport = false;
   };