diff --git a/cmake/toolchain_selection.cmake b/cmake/toolchain_selection.cmake
new file mode 100644
index 0000000..9deefd5
--- /dev/null
+++ b/cmake/toolchain_selection.cmake
@@ -0,0 +1,28 @@
+#-------------------------------------------------------------------------------
+# Copyright (c) 2023, Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+#-------------------------------------------------------------------------------
+
+# Select toolchain file if it is not specified via command line or the absolutate path
+# is unavailable.
+
+if (NOT DEFINED TFM_TOOLCHAIN_FILE)
+    set(TFM_TOOLCHAIN_FILE    ${CONFIG_SPE_PATH}/cmake/toolchain_ns_GNUARM.cmake)
+endif()
+
+if(NOT IS_ABSOLUTE ${TFM_TOOLCHAIN_FILE})
+    get_filename_component(RELATIVE_DIR ${TFM_TOOLCHAIN_FILE} DIRECTORY)
+    if("${RELATIVE_DIR}" STREQUAL "")
+        # Assume the toolchain is put in ${CONFIG_SPE_PATH}/cmake
+        set(TFM_TOOLCHAIN_FILE "${CONFIG_SPE_PATH}/cmake/${TFM_TOOLCHAIN_FILE}")
+    else()
+        # Assume the relative path is based on ${CONFIG_SPE_PATH}
+        set(TFM_TOOLCHAIN_FILE "${CONFIG_SPE_PATH}/${TFM_TOOLCHAIN_FILE}")
+    endif()
+endif()
+
+if(NOT EXISTS ${TFM_TOOLCHAIN_FILE})
+    message(FATAL_ERROR "TFM_TOOLCHAIN_FILE ${TFM_TOOLCHAIN_FILE} doesn't exist")
+endif()