diff --git a/.github/workflows/buildmgr.yml b/.github/workflows/buildmgr.yml
index 5ecf7f147..dbc86bdd8 100644
--- a/.github/workflows/buildmgr.yml
+++ b/.github/workflows/buildmgr.yml
@@ -308,6 +308,7 @@ jobs:
       CI_CBUILD_INSTALLER: ${{ github.workspace }}/cbuild_install.sh
       CMSIS_PACK_ROOT: ${{ github.workspace }}/packs
       GCC_TOOLCHAIN_ROOT: ${{ github.workspace }}/${{ matrix.toolchain_root }}
+      GCC_TOOLCHAIN_10_3_1: ${{ github.workspace }}/${{ matrix.toolchain_root }}
       CI_ARCH: ${{ matrix.arch }}
     strategy:
       #fail-fast: true
diff --git a/tools/buildmgr/cbuild/src/CbuildModel.cpp b/tools/buildmgr/cbuild/src/CbuildModel.cpp
index 159727ffc..233ec5656 100644
--- a/tools/buildmgr/cbuild/src/CbuildModel.cpp
+++ b/tools/buildmgr/cbuild/src/CbuildModel.cpp
@@ -473,10 +473,9 @@ bool CbuildModel::GetCompatibleToolchain(const string& name, const string& versi
   }
 
   if (selectedVersion.empty()) {
-    // no compatible registered toolchain was found, search for a suitable config file
-    if (GetToolchainConfig(toolchainConfigFiles, name, versionRange)) {
-      return true;
-    }
+    // no compatible registered toolchain was found
+    LogMsg("M616", VAL("NAME", name));
+    return false;
   } else {
     // registered toolchain was found
     m_toolchainRegisteredVersion = selectedVersion;
diff --git a/tools/buildmgr/cbuild/src/CbuildMsgs.cpp b/tools/buildmgr/cbuild/src/CbuildMsgs.cpp
index c60c85ee2..4a398471b 100644
--- a/tools/buildmgr/cbuild/src/CbuildMsgs.cpp
+++ b/tools/buildmgr/cbuild/src/CbuildMsgs.cpp
@@ -82,6 +82,7 @@ void InitMessageTable()
   table["M613"] = MessageEntry(MsgLevel::LEVEL_ERROR,    CRLF_B,   "File '%PATH%' has unexpected format!"                                        );
   table["M614"] = MessageEntry(MsgLevel::LEVEL_ERROR,    CRLF_B,   "Missing access sequence delimiter: '%ACCSEQDELIM%'!"                         );
   table["M615"] = MessageEntry(MsgLevel::LEVEL_ERROR,    CRLF_B,   "%PROP% '%VAL%' was not found in the loaded packs!"                           );
+  table["M616"] = MessageEntry(MsgLevel::LEVEL_ERROR,    CRLF_B,   "compiler registration environment variable missing, format: %NAME%_TOOLCHAIN_<major>_<minor>_<patch>");
 
   table["M630"] = MessageEntry(MsgLevel::LEVEL_WARNING,  CRLF_B,   "Device '%DEV%' is substituted with variant '%VAR%'."                         );
   table["M631"] = MessageEntry(MsgLevel::LEVEL_WARNING,  CRLF_B,   "Project must have exactly one target element!"                               );
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/AccessSequence/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/AccessSequence/CMakeLists.txt.ref
index c5c418b48..bce7200ba 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/AccessSequence/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/AccessSequence/CMakeLists.txt.ref
@@ -128,6 +128,8 @@ set(CXX_FLAGS_C:/Temp/devtools/tools/buildmgr/test/testinput/Examples/GCC/Access
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "9.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.3.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/Asm/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/Asm/CMakeLists.txt.ref
index d71d1e226..cc0008533 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/Asm/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/Asm/CMakeLists.txt.ref
@@ -125,6 +125,8 @@ set(AS_FLAGS_C:/sandbox/devtools/build/TestOutput/TestData/Examples/GCC/Asm/GAS.
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "9.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.3.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/BranchProtection/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/BranchProtection/CMakeLists.txt.ref
index 59fb28a5c..5babc7e73 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/BranchProtection/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/BranchProtection/CMakeLists.txt.ref
@@ -48,6 +48,8 @@ set(LIB_FILES
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "10.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.3.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/Build_GCC/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/Build_GCC/CMakeLists.txt.ref
index 20b794d70..a64f0b3b5 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/Build_GCC/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/Build_GCC/CMakeLists.txt.ref
@@ -51,6 +51,8 @@ set(LIB_FILES
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "9.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.3.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/Build_GPP/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/Build_GPP/CMakeLists.txt.ref
index 01b5306f5..2c5992eac 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/Build_GPP/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/Build_GPP/CMakeLists.txt.ref
@@ -55,6 +55,8 @@ set(LIB_FILES
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "9.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.3.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/DupFilename/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/DupFilename/CMakeLists.txt.ref
index 73e841408..a2c739818 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/DupFilename/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/DupFilename/CMakeLists.txt.ref
@@ -32,6 +32,8 @@ set(CC_SRC_FILES
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "9.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.3.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/FlagOrder/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/FlagOrder/CMakeLists.txt.ref
index 84e43bfe2..588b3d560 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/FlagOrder/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/FlagOrder/CMakeLists.txt.ref
@@ -38,6 +38,8 @@ set(CC_SRC_FILES
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "9.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.3.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/Flags/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/Flags/CMakeLists.txt.ref
index 4e489fec0..9e6c6f35e 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/Flags/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/Flags/CMakeLists.txt.ref
@@ -55,6 +55,8 @@ set(CC_FLAGS_C:/Users/Test/AppData/Local/Arm/Packs/ARM/CMSIS/5.8.0/CMSIS/RTOS2/R
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "9.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.3.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/Library/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/Library/CMakeLists.txt.ref
index aad8ba2a5..4bf51fd1f 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/Library/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/Library/CMakeLists.txt.ref
@@ -35,6 +35,8 @@ set(CXX_SRC_FILES
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "10.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.2.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/LibraryCustom/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/LibraryCustom/CMakeLists.txt.ref
index 7fbdaa13d..ef8b072d3 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/LibraryCustom/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/LibraryCustom/CMakeLists.txt.ref
@@ -35,6 +35,8 @@ set(CXX_SRC_FILES
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "10.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.2.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/LinkerPreProcessing/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/LinkerPreProcessing/CMakeLists.txt.ref
index dc08aae58..58e5185c9 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/LinkerPreProcessing/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/LinkerPreProcessing/CMakeLists.txt.ref
@@ -45,6 +45,8 @@ set(CC_SRC_FILES
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "9.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.3.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/LinkerPreProcessingDefines/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/LinkerPreProcessingDefines/CMakeLists.txt.ref
index c60f56998..3bc4efbc2 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/LinkerPreProcessingDefines/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/LinkerPreProcessingDefines/CMakeLists.txt.ref
@@ -62,6 +62,8 @@ set(CC_SRC_FILES
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "9.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.3.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/LinkerPreProcessingSrcFile/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/LinkerPreProcessingSrcFile/CMakeLists.txt.ref
index 67d4e16ec..a594b8ddb 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/LinkerPreProcessingSrcFile/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/LinkerPreProcessingSrcFile/CMakeLists.txt.ref
@@ -39,6 +39,8 @@ set(CC_SRC_FILES
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "9.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.3.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/Minimal/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/Minimal/CMakeLists.txt.ref
index b7e832e7e..a264c126e 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/Minimal/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/Minimal/CMakeLists.txt.ref
@@ -40,6 +40,8 @@ set(CC_SRC_FILES
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "9.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.3.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/NestedGroups/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/NestedGroups/CMakeLists.txt.ref
index c555e4a1e..062e10ceb 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/NestedGroups/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/NestedGroups/CMakeLists.txt.ref
@@ -70,6 +70,8 @@ set(CC_FLAGS_C:/sandbox/devtools/build/TestOutput/TestData/Examples/GCC/NestedGr
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "9.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.3.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/Pre Include/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/Pre Include/CMakeLists.txt.ref
index 0f38920e7..9a11b3ff6 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/Pre Include/CMakeLists.txt.ref	
+++ b/tools/buildmgr/test/testinput/Examples/GCC/Pre Include/CMakeLists.txt.ref	
@@ -62,6 +62,8 @@ set(PRE_INC_LOCAL_C:/Users/Test/AppData/Local/Arm/Packs/Keil/PreIncludeTestPack/
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "9.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.3.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/RelativePath/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/RelativePath/CMakeLists.txt.ref
index 78e5832d9..40c29168d 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/RelativePath/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/RelativePath/CMakeLists.txt.ref
@@ -42,6 +42,8 @@ set(CC_SRC_FILES
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "9.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.3.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/StandardLibrary/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/StandardLibrary/CMakeLists.txt.ref
index 2303f80bc..92d72760a 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/StandardLibrary/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/StandardLibrary/CMakeLists.txt.ref
@@ -39,6 +39,8 @@ set(CC_SRC_FILES
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "9.2.1")
 include ("C:/sandbox/devtools/tools/buildmgr/cbuildgen/config/GCC.10.3.1.cmake")
 include ("C:/sandbox/devtools/tools/buildmgr/cbuildgen/config/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/TranslationControl/Project1/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/TranslationControl/Project1/CMakeLists.txt.ref
index 7f2daf316..8f8e1bdad 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/TranslationControl/Project1/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/TranslationControl/Project1/CMakeLists.txt.ref
@@ -102,6 +102,8 @@ set(CXX_FLAGS_C:/Sandbox/devtools-external/build/testoutput/GCC/TranslationContr
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "9.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.2.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/TranslationControl/Project2/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/TranslationControl/Project2/CMakeLists.txt.ref
index 10d16d6cd..fac806402 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/TranslationControl/Project2/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/TranslationControl/Project2/CMakeLists.txt.ref
@@ -124,6 +124,8 @@ set(CXX_FLAGS_C:/Sandbox/devtools-external/build/testoutput/GCC/TranslationContr
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "9.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.2.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/TranslationControl/Project3/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/TranslationControl/Project3/CMakeLists.txt.ref
index a5eaf1a94..1800c1328 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/TranslationControl/Project3/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/TranslationControl/Project3/CMakeLists.txt.ref
@@ -68,6 +68,8 @@ set(CXX_SRC_FILES
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "10.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.2.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/TrustZone/CM33_ns/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/TrustZone/CM33_ns/CMakeLists.txt.ref
index 0685f81ab..21f4a95ca 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/TrustZone/CM33_ns/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/TrustZone/CM33_ns/CMakeLists.txt.ref
@@ -49,6 +49,8 @@ set(LIB_FILES
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "9.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.2.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/TrustZone/CM33_s/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/TrustZone/CM33_s/CMakeLists.txt.ref
index 422ea29ec..8d8a33088 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/TrustZone/CM33_s/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/TrustZone/CM33_s/CMakeLists.txt.ref
@@ -43,6 +43,8 @@ set(CC_SRC_FILES
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "10.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.2.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/testinput/Examples/GCC/Whitespace/CMakeLists.txt.ref b/tools/buildmgr/test/testinput/Examples/GCC/Whitespace/CMakeLists.txt.ref
index 82a5bc506..1083bd85d 100644
--- a/tools/buildmgr/test/testinput/Examples/GCC/Whitespace/CMakeLists.txt.ref
+++ b/tools/buildmgr/test/testinput/Examples/GCC/Whitespace/CMakeLists.txt.ref
@@ -48,6 +48,8 @@ set(LIB_FILES
 
 # Toolchain config map
 
+set(REGISTERED_TOOLCHAIN_ROOT "C:/Compilers/GCC/10.3.1/bin")
+set(REGISTERED_TOOLCHAIN_VERSION "10.3.1")
 set(TOOLCHAIN_VERSION_MIN "10.2.1")
 include ("C:/sandbox/cbuild/etc/GCC.10.2.1.cmake")
 include ("C:/sandbox/cbuild/etc/CMSIS-Build-Utils.cmake")
diff --git a/tools/buildmgr/test/unittests/src/CbuildModelTests.cpp b/tools/buildmgr/test/unittests/src/CbuildModelTests.cpp
index 6550e6606..f5abbf57d 100644
--- a/tools/buildmgr/test/unittests/src/CbuildModelTests.cpp
+++ b/tools/buildmgr/test/unittests/src/CbuildModelTests.cpp
@@ -14,22 +14,19 @@ class CbuildModelTests : public CbuildModel, public ::testing::Test {
 };
 
 
-TEST_F(CbuildModelTests, GetCompatibleToolchain_Select_Latest) {
+TEST_F(CbuildModelTests, GetCompatibleToolchain_NotRegistered) {
   string name = "AC6", versionRange = "6.5.0:6.18.0", dir;
   string toolchainDir = testinput_folder + "/toolchain";
-  string expectedToolchainVersion = "6.16.0";
-  string expectedToolchainConfig = toolchainDir + "/AC6.6.16.0.cmake";
-  RteFsUtils::NormalizePath(expectedToolchainConfig);
   vector<string> envVars;
 
-  // Select latest compatible toolchain
+  // Check not registered toolchains
   ASSERT_TRUE(RteFsUtils::CreateDirectories(toolchainDir));
   ASSERT_TRUE(RteFsUtils::CreateTextFile(toolchainDir + "/AC6.6.6.4.cmake", ""));
   ASSERT_TRUE(RteFsUtils::CreateTextFile(toolchainDir + "/AC6.6.16.0.cmake", ""));
   ASSERT_TRUE(RteFsUtils::CreateTextFile(toolchainDir + "/GCC.6.19.0.cmake", ""));
-  EXPECT_TRUE(GetCompatibleToolchain(name, versionRange, toolchainDir, envVars));
-  EXPECT_EQ(m_toolchainConfigVersion, expectedToolchainVersion);
-  EXPECT_EQ(m_toolchainConfig, expectedToolchainConfig);
+  EXPECT_FALSE(GetCompatibleToolchain(name, versionRange, toolchainDir, envVars));
+  EXPECT_TRUE(m_toolchainConfigVersion.empty());
+  EXPECT_TRUE(m_toolchainConfig.empty());
   ASSERT_TRUE(RteFsUtils::RemoveDir(toolchainDir));
 }
 
@@ -61,25 +58,6 @@ TEST_F(CbuildModelTests, GetCompatibleToolchain_Invalid_Files) {
   ASSERT_TRUE(RteFsUtils::RemoveDir(toolchainDir));
 }
 
-TEST_F(CbuildModelTests, GetCompatibleToolchain_Select_Latest_recursively) {
-  string name = "AC6", versionRange = "6.5.0:6.18.0", dir;
-  string toolchainDir = testinput_folder + "/toolchain";
-  string expectedToolchainVersion = "6.16.0";
-  string expectedToolchainConfig = toolchainDir + "/Test/AC6.6.16.0.cmake";
-  RteFsUtils::NormalizePath(expectedToolchainConfig);
-  vector<string> envVars;
-
-  // Select latest compatible toolchain
-  ASSERT_TRUE(RteFsUtils::CreateDirectories(toolchainDir+"/Test"));
-  ASSERT_TRUE(RteFsUtils::CreateTextFile(toolchainDir + "/Test/AC6.6.6.4.cmake", ""));
-  ASSERT_TRUE(RteFsUtils::CreateTextFile(toolchainDir + "/Test/AC6.6.16.0.cmake", ""));
-  ASSERT_TRUE(RteFsUtils::CreateTextFile(toolchainDir + "/Test/GCC.6.19.0.cmake", ""));
-  EXPECT_TRUE(GetCompatibleToolchain(name, versionRange, toolchainDir, envVars));
-  EXPECT_EQ(m_toolchainConfigVersion, expectedToolchainVersion);
-  EXPECT_EQ(m_toolchainConfig, expectedToolchainConfig);
-  ASSERT_TRUE(RteFsUtils::RemoveDir(toolchainDir));
-}
-
 TEST_F(CbuildModelTests, GetCompatibleToolchain_Registered) {
   string name = "AC6", versionRange = "6.17.0:6.18.0", dir;
   string toolchainDir = testinput_folder + "/toolchain";