properly revert amd-ucode updates

since they break boot on my laptop

pkgs/default.nix

@@ -13,6 +13,22 @@ let
 in
 
 {
+  linux-firmware = pkgs.stdenvNoCC.mkDerivation {
+    inherit (pkgs.linux-firmware) pname version src meta;
+    dontFixup = true;
+    passthru = { inherit (pkgs.linux-firmware) version; };
+    installFlags = [ "DESTDIR=$(out)" ];
+
+    # revert microcode updates which break boot for me
+    patches = [ ./revert-amd-ucode-update.patch ];
+    postPatch = ''
+      cp ${pkgs.fetchurl {
+        url = "https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/amd-ucode/microcode_amd_fam17h.bin?id=b250b32ab1d044953af2dc5e790819a7703b7ee6";
+        hash = "sha256-HnKjEb2di7BiKB09JYUjIUuZNCVgXlwRSbjijnuYBcM=";
+      }} amd-ucode/microcode_amd_fam17h.bin
+    '';
+  };
+
   inherit (nix-gaming) faf-client osu-lazer-bin;
   inherit nixForNixPlugins;
   nix-plugins = pkgs.nix-plugins.overrideAttrs (old: {

pkgs/revert-amd-ucode-update.patch

@@ -0,0 +1,52 @@
+diff --git a/WHENCE b/WHENCE
+index dcb86fa..b92e529 100644
+--- a/WHENCE
++++ b/WHENCE
+@@ -3909,7 +3909,7 @@ Raw: amd-ucode/microcode_amd_fam16h.bin
+ Version: 2014-10-28
+ File: amd-ucode/microcode_amd_fam17h.bin
+ Raw: amd-ucode/microcode_amd_fam17h.bin
+-Version: 2023-07-19
++Version: 2023-04-13
+ File: amd-ucode/microcode_amd_fam19h.bin
+ Raw: amd-ucode/microcode_amd_fam19h.bin
+ Version: 2023-07-18
+diff --git a/amd-ucode/README b/amd-ucode/README
+index 1d39da3..4308fe2 100644
+--- a/amd-ucode/README
++++ b/amd-ucode/README
+@@ -32,9 +32,8 @@ Microcode patches in microcode_amd_fam16h.bin:
+ 
+ Microcode patches in microcode_amd_fam17h.bin:
+   Family=0x17 Model=0x08 Stepping=0x02: Patch=0x0800820d Length=3200 bytes
+-  Family=0x17 Model=0x31 Stepping=0x00: Patch=0x0830107a Length=3200 bytes
+-  Family=0x17 Model=0xa0 Stepping=0x00: Patch=0x08a00008 Length=3200 bytes
+   Family=0x17 Model=0x01 Stepping=0x02: Patch=0x0800126e Length=3200 bytes
++  Family=0x17 Model=0x31 Stepping=0x00: Patch=0x08301072 Length=3200 bytes
+ 
+ Microcode patches in microcode_amd_fam19h.bin:
+   Family=0x19 Model=0x01 Stepping=0x01: Patch=0x0a0011d1 Length=5568 bytes
+diff --git a/amd-ucode/microcode_amd_fam17h.bin.asc b/amd-ucode/microcode_amd_fam17h.bin.asc
+index 34a4024..27da52c 100644
+--- a/amd-ucode/microcode_amd_fam17h.bin.asc
++++ b/amd-ucode/microcode_amd_fam17h.bin.asc
+@@ -1,11 +1,11 @@
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++=lP2S
+ -----END PGP SIGNATURE-----