diff --git a/pkgs/development/compilers/llvm/20/llvm/orcjit.patch b/pkgs/development/compilers/llvm/20/llvm/orcjit.patch
deleted file mode 100644
index c08e3f80d73b..000000000000
--- a/pkgs/development/compilers/llvm/20/llvm/orcjit.patch
+++ /dev/null
@@ -1,53 +0,0 @@
-From 03d6f704d07aa3650a2f59be6f7802a8735460c3 Mon Sep 17 00:00:00 2001
-From: Lang Hames <lhames@gmail.com>
-Date: Wed, 29 Jan 2025 03:58:29 +0000
-Subject: [PATCH] [ORC][LLI] Remove redundant eh-frame registration plugin
- construction from lli.
-
-As of d0052ebbe2e the setUpGenericLLVMIRPlatform function will automatically
-add an instance of the EHFrameRegistrationPlugin (for LLJIT instances whose
-object linking layers are ObjectLinkingLayers, not RTDyldObjectLinkingLayers).
-
-This commit removes the redundant plugin creation in the object linking
-layer constructor function in lli.cpp to prevent duplicate registration of
-eh-frames, which is likely the cause of recent bot failures, e.g.
-https://lab.llvm.org/buildbot/#/builders/108/builds/8685.
-
-(cherry picked from commit 9052b37ab1aa67a039b34356f37236fecc42bac2)
----
- llvm/tools/lli/lli.cpp | 14 ++++----------
- 1 file changed, 4 insertions(+), 10 deletions(-)
-
-diff --git a/llvm/tools/lli/lli.cpp b/tools/lli/lli.cpp
-index 448660a539a0b0..19246f03941673 100644
---- a/llvm/tools/lli/lli.cpp
-+++ b/tools/lli/lli.cpp
-@@ -27,9 +27,7 @@
- #include "llvm/ExecutionEngine/Orc/AbsoluteSymbols.h"
- #include "llvm/ExecutionEngine/Orc/DebugUtils.h"
- #include "llvm/ExecutionEngine/Orc/Debugging/DebuggerSupport.h"
--#include "llvm/ExecutionEngine/Orc/EHFrameRegistrationPlugin.h"
- #include "llvm/ExecutionEngine/Orc/EPCDynamicLibrarySearchGenerator.h"
--#include "llvm/ExecutionEngine/Orc/EPCEHFrameRegistrar.h"
- #include "llvm/ExecutionEngine/Orc/EPCGenericRTDyldMemoryManager.h"
- #include "llvm/ExecutionEngine/Orc/ExecutionUtils.h"
- #include "llvm/ExecutionEngine/Orc/IRPartitionLayer.h"
-@@ -1033,14 +1031,10 @@ int runOrcJIT(const char *ProgName) {
-     Builder.getJITTargetMachineBuilder()
-         ->setRelocationModel(Reloc::PIC_)
-         .setCodeModel(CodeModel::Small);
--    Builder.setObjectLinkingLayerCreator([&P](orc::ExecutionSession &ES,
--                                              const Triple &TT) {
--      auto L = std::make_unique<orc::ObjectLinkingLayer>(ES);
--      if (P != LLJITPlatform::ExecutorNative)
--        L->addPlugin(std::make_unique<orc::EHFrameRegistrationPlugin>(
--            ES, ExitOnErr(orc::EPCEHFrameRegistrar::Create(ES))));
--      return L;
--    });
-+    Builder.setObjectLinkingLayerCreator(
-+        [&](orc::ExecutionSession &ES, const Triple &TT) {
-+          return std::make_unique<orc::ObjectLinkingLayer>(ES);
-+        });
-   }
- 
-   auto J = ExitOnErr(Builder.create());
diff --git a/pkgs/development/compilers/llvm/common/default.nix b/pkgs/development/compilers/llvm/common/default.nix
index 3b657ce5bb3f..116d7c6406e4 100644
--- a/pkgs/development/compilers/llvm/common/default.nix
+++ b/pkgs/development/compilers/llvm/common/default.nix
@@ -501,10 +501,16 @@ let
                 })
               ]
           ++
-            lib.optional (lib.versions.major metadata.release_version == "20")
-              # Fix OrcJIT
-              # PR: https://github.com/llvm/llvm-project/pull/125431
-              (metadata.getVersionFile "llvm/orcjit.patch");
+            lib.optional (lib.versionAtLeast metadata.release_version "20")
+              # Fix OrcJIT tests with page sizes > 16k
+              # PR: https://github.com/llvm/llvm-project/pull/127115
+              (
+                fetchpatch {
+                  url = "https://github.com/llvm/llvm-project/commit/415607e10b56d0e6c4661ff1ec5b9b46bf433cba.patch";
+                  stripLen = 1;
+                  hash = "sha256-vBbuduJB+NnNE9qtR93k64XKrwvc7w3vowjL/aT+iEA=";
+                }
+              );
         pollyPatches =
           [ (metadata.getVersionFile "llvm/gnu-install-dirs-polly.patch") ]
           ++ lib.optional (lib.versionAtLeast metadata.release_version "15")
diff --git a/pkgs/development/compilers/llvm/common/libc/default.nix b/pkgs/development/compilers/llvm/common/libc/default.nix
index 900c884c72b4..f57239b7a978 100644
--- a/pkgs/development/compilers/llvm/common/libc/default.nix
+++ b/pkgs/development/compilers/llvm/common/libc/default.nix
@@ -14,7 +14,6 @@
   ninja,
   isFullBuild ? true,
   linuxHeaders,
-  fetchpatch,
 }:
 let
   pname = "libc";
@@ -28,26 +27,12 @@ let
   '');
 in
 stdenv.mkDerivation (finalAttrs: {
-  inherit pname version;
+  inherit pname version patches;
 
   src = src';
 
   sourceRoot = "${finalAttrs.src.name}/runtimes";
 
-  patches =
-    lib.optional (lib.versions.major version == "20")
-      # Removes invalid token from the LLVM version being placed in the namespace.
-      # Can be removed when LLVM 20 bumps to rc2.
-      # PR: https://github.com/llvm/llvm-project/pull/126284
-      (
-        fetchpatch {
-          url = "https://github.com/llvm/llvm-project/commit/3a3a3230d171e11842a9940b6da0f72022b1c5b3.patch";
-          stripLen = 1;
-          hash = "sha256-QiU1cWp+027ZZNVdvfGVwbIoRd9jqtSbftGsmaW1gig=";
-        }
-      )
-    ++ patches;
-
   nativeBuildInputs =
     [
       cmake
diff --git a/pkgs/development/compilers/llvm/default.nix b/pkgs/development/compilers/llvm/default.nix
index f2ac815b4b2c..68730c5c96d9 100644
--- a/pkgs/development/compilers/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/default.nix
@@ -30,7 +30,7 @@ let
     "17.0.6".officialRelease.sha256 = "sha256-8MEDLLhocshmxoEBRSKlJ/GzJ8nfuzQ8qn0X/vLA+ag=";
     "18.1.8".officialRelease.sha256 = "sha256-iiZKMRo/WxJaBXct9GdAcAT3cz9d9pnAcO1mmR6oPNE=";
     "19.1.7".officialRelease.sha256 = "sha256-cZAB5vZjeTsXt9QHbP5xluWNQnAHByHtHnAhVDV0E6I=";
-    "20.1.0-rc1".officialRelease.sha256 = "sha256-yOczbperlR20+iLoao9g0CR+Ml2mjTCx1cqP/9WOhME=";
+    "20.1.0-rc2".officialRelease.sha256 = "sha256-lBx+MWfYBM6XSJozacALMGlo0DUUWqnsBQyO8lDljSo=";
     "21.0.0-git".gitRelease = {
       rev = "c9f1d2cbf18990311ea1287cc154e3784a10a3b0";
       rev-version = "21.0.0-unstable-2025-02-10";