diff --git a/cmake/toolchain_GNUARM.cmake b/cmake/toolchain_GNUARM.cmake
new file mode 100644
index 0000000..fc6fe4c
--- /dev/null
+++ b/cmake/toolchain_GNUARM.cmake
@@ -0,0 +1,176 @@
+#-------------------------------------------------------------------------------
+# Copyright (c) 2020, Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+#-------------------------------------------------------------------------------
+
+set(CMAKE_SYSTEM_NAME Generic)
+
+find_program(CMAKE_C_COMPILER ${CROSS_COMPILE}-gcc)
+set(CMAKE_ASM_COMPILER ${CMAKE_C_COMPILER})
+
+#set(CMAKE_C_COMPILER ${CROSS_COMPILE}-gcc)
+#set(CMAKE_ASM_COMPILER ${CROSS_COMPILE}-gcc)
+set(CMAKE_AR ${CROSS_COMPILE}-gcc-ar)
+set(CMAKE_RANLIB ${CROSS_COMPILE}-gcc-ranlib)
+
+set(LINKER_VENEER_OUTPUT_FLAG -Wl,--cmse-implib,--out-implib=)
+set(COMPILER_CMSE_FLAG -mcmse)
+
+# This variable name is a bit of a misnomer. The file it is set to is included
+# at a particular step in the compiler initialisation. It is used here to
+# configure the extensions for object files. Despite the name, it also works
+# with the Ninja generator.
+set(CMAKE_USER_MAKE_RULES_OVERRIDE ${CMAKE_CURRENT_LIST_DIR}/set_extensions.cmake)
+
+macro(arm_toolchain_reset_compiler_flags)
+    set_property(DIRECTORY PROPERTY COMPILE_OPTIONS "")
+
+    add_compile_options(
+        --specs=nano.specs
+        -Wall
+        -Wno-format
+        -Wno-return-type
+        -Wno-unused-but-set-variable
+        -c
+        -fdata-sections
+        -ffunction-sections
+        -fno-builtin
+        -fshort-enums
+        -funsigned-char
+        -mthumb
+        -nostdlib
+        -std=c99
+        $<$<NOT:$<BOOL:${ARM_SYSTEM_FP}>>:-msoft-float>
+    )
+endmacro()
+
+macro(arm_toolchain_reset_linker_flags)
+    set_property(DIRECTORY PROPERTY LINK_OPTIONS "")
+
+    add_link_options(
+        --entry=Reset_Handler
+        --specs=nano.specs
+        LINKER:-check-sections
+        LINKER:-fatal-warnings
+        LINKER:--gc-sections
+        LINKER:--no-wchar-size-warning
+        LINKER:--print-memory-usage
+        LINKER:-Map=$<TARGET_FILE_BASE_NAME:$<TARGET_PROPERTY:NAME>>.map
+        LINKER:--cref
+    )
+endmacro()
+
+macro(arm_toolchain_set_processor_arch)
+    set(CMAKE_SYSTEM_PROCESSOR ${ARM_SYSTEM_PROCESSOR})
+    set(CMAKE_SYSTEM_ARCHITECTURE ${ARM_SYSTEM_ARCHITECTURE})
+
+    if (DEFINED ARM_SYSTEM_DSP)
+        if(NOT ARM_SYSTEM_DSP)
+            string(APPEND CMAKE_SYSTEM_PROCESSOR "+nodsp")
+        endif()
+    endif()
+endmacro()
+
+macro(arm_toolchain_reload_compiler)
+    arm_toolchain_set_processor_arch()
+    arm_toolchain_reset_compiler_flags()
+    arm_toolchain_reset_linker_flags()
+
+    unset(CMAKE_C_FLAGS_INIT)
+    unset(CMAKE_ASM_FLAGS_INIT)
+
+    set(CMAKE_C_FLAGS_INIT "-mcpu=${CMAKE_SYSTEM_PROCESSOR}")
+    set(CMAKE_ASM_FLAGS_INIT "-mcpu=${CMAKE_SYSTEM_PROCESSOR}")
+    set(CMAKE_C_LINK_FLAGS "-mcpu=${CMAKE_SYSTEM_PROCESSOR}")
+    set(CMAKE_ASM_LINK_FLAGS "-mcpu=${CMAKE_SYSTEM_PROCESSOR}")
+
+    set(CMAKE_C_FLAGS ${CMAKE_C_FLAGS_INIT})
+    set(CMAKE_ASM_FLAGS ${CMAKE_ASM_FLAGS_INIT})
+endmacro()
+
+# Configure environment for the compiler setup run by cmake at the first
+# `project` call in <tfm_root>/CMakeLists.txt. After this mandatory setup is
+# done, all further compiler setup is done via arm_toolchain_reload_compiler()
+arm_toolchain_reload_compiler()
+
+macro(target_add_scatter_file target)
+    target_link_options(${target}
+        PRIVATE
+        -T $<TARGET_OBJECTS:${target}_scatter>
+    )
+
+    add_dependencies(${target}
+        ${target}_scatter
+    )
+
+    add_library(${target}_scatter OBJECT)
+    foreach(scatter_file ${ARGN})
+        target_sources(${target}_scatter
+            PRIVATE
+                ${scatter_file}
+        )
+        # Cmake cannot use generator expressions in the
+        # set_source_file_properties command, so instead we just parse the regex
+        # for the filename and set the property on all files, regardless of if
+        # the generator expression would evaluate to true or not.
+        string(REGEX REPLACE ".*>:(.*)>$" "\\1" SCATTER_FILE_PATH "${scatter_file}")
+        set_source_files_properties(${SCATTER_FILE_PATH}
+            PROPERTIES
+            LANGUAGE C
+        )
+    endforeach()
+
+    target_link_libraries(${target}_scatter
+        platform_region_defs
+    )
+
+    target_compile_options(${target}_scatter
+        PRIVATE
+            -E
+            -P
+            -xc
+    )
+endmacro()
+
+macro(add_convert_to_bin_target target)
+    get_target_property(bin_dir ${target} RUNTIME_OUTPUT_DIRECTORY)
+
+    add_custom_target(${target}_bin
+        SOURCES ${bin_dir}/${target}.bin
+    )
+    add_custom_command(OUTPUT ${bin_dir}/${target}.bin
+        DEPENDS ${target}
+        COMMAND ${CMAKE_OBJCOPY}
+            -O binary $<TARGET_FILE:${target}>
+            ${bin_dir}/${target}.bin
+    )
+
+    add_custom_target(${target}_elf
+        SOURCES ${bin_dir}/${target}.elf
+    )
+    add_custom_command(OUTPUT ${bin_dir}/${target}.elf
+        DEPENDS ${target}
+        COMMAND ${CMAKE_OBJCOPY}
+            -O elf32-littlearm $<TARGET_FILE:${target}>
+            ${bin_dir}/${target}.elf
+    )
+
+    add_custom_target(${target}_hex
+        SOURCES ${bin_dir}/${target}.hex
+    )
+    add_custom_command(OUTPUT ${bin_dir}/${target}.hex
+        DEPENDS ${target}
+        COMMAND ${CMAKE_OBJCOPY}
+            -O ihex $<TARGET_FILE:${target}>
+            ${bin_dir}/${target}.hex
+    )
+
+    add_custom_target(${target}_binaries
+        ALL
+        DEPENDS ${target}_bin
+        DEPENDS ${target}_elf
+        DEPENDS ${target}_hex
+    )
+endmacro()