diff --git a/external/libfdt/fix-strnlen.patch b/external/libfdt/fix-strnlen.patch
new file mode 100644
index 0000000..7a7bb7d
--- /dev/null
+++ b/external/libfdt/fix-strnlen.patch
@@ -0,0 +1,30 @@
+This patch enables using libfdt's strlen() implementation.
+
+diff --git i/libfdt/libfdt_env.h w/libfdt/libfdt_env.h
+index 73b6d40..3a2d38c 100644
+--- i/libfdt/libfdt_env.h
++++ w/libfdt/libfdt_env.h
+@@ -66,13 +66,6 @@ static inline fdt64_t cpu_to_fdt64(uint64_t x)
+ #undef CPU_TO_FDT16
+ #undef EXTRACT_BYTE
+
+-#ifdef __APPLE__
+-#include <AvailabilityMacros.h>
+-
+-/* strnlen() is not available on Mac OS < 10.7 */
+-# if !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED < \
+-                                         MAC_OS_X_VERSION_10_7)
+-
+ #define strnlen fdt_strnlen
+
+ /*
+@@ -88,9 +81,4 @@ static inline size_t fdt_strnlen(const char *string, size_t max_count)
+     return p ? p - string : max_count;
+ }
+
+-#endif /* !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED <
+-          MAC_OS_X_VERSION_10_7) */
+-
+-#endif /* __APPLE__ */
+-
+ #endif /* LIBFDT_ENV_H */
diff --git a/external/libfdt/libfdt.cmake b/external/libfdt/libfdt.cmake
new file mode 100644
index 0000000..9da9bba
--- /dev/null
+++ b/external/libfdt/libfdt.cmake
@@ -0,0 +1,57 @@
+#-------------------------------------------------------------------------------
+# Copyright (c) 2022, Arm Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+#-------------------------------------------------------------------------------
+
+# Use libfdt path from the environment if defined
+if (DEFINED ENV{TS_LIBFDT_PATH})
+	set(LIBFDT_PATH $ENV{TS_LIBFDT_PATH} CACHE PATH "Location of libfdt" FORCE)
+endif()
+
+# Otherwise clone the dtc repo (which contains libfdt)
+set(DTC_URL "https://github.com/dgibson/dtc" CACHE STRING "dtc repository URL")
+set(DTC_REFSPEC "v1.6.1" CACHE STRING "dtc git refspec")
+set(DTC_SOURCE_DIR "${CMAKE_CURRENT_BINARY_DIR}/_deps/dtc-src" CACHE PATH "Location of dtc source")
+
+set(GIT_OPTIONS
+	GIT_REPOSITORY ${DTC_URL}
+	GIT_TAG ${DTC_REFSPEC}
+	PATCH_COMMAND git stash COMMAND git apply ${CMAKE_CURRENT_LIST_DIR}/fix-strnlen.patch
+)
+
+include(${TS_ROOT}/tools/cmake/common/LazyFetch.cmake REQUIRED)
+LazyFetch_MakeAvailable(
+	DEP_NAME dtc
+	FETCH_OPTIONS "${GIT_OPTIONS}"
+	SOURCE_DIR ${DTC_SOURCE_DIR}
+)
+
+find_path(LIBFDT_PATH
+	NAMES fdt.c
+	PATHS ${DTC_SOURCE_DIR}/libfdt
+	NO_DEFAULT_PATH
+	REQUIRED
+	DOC "Location of libfdt"
+)
+
+# Add libfdt source files to the target
+if (NOT DEFINED TGT)
+	message(FATAL_ERROR "mandatory parameter TGT is not defined.")
+endif()
+
+target_sources(${TGT} PRIVATE
+	"${LIBFDT_PATH}/fdt.c"
+	"${LIBFDT_PATH}/fdt_ro.c"
+	"${LIBFDT_PATH}/fdt_wip.c"
+	"${LIBFDT_PATH}/fdt_sw.c"
+	"${LIBFDT_PATH}/fdt_rw.c"
+	"${LIBFDT_PATH}/fdt_strerror.c"
+	"${LIBFDT_PATH}/fdt_empty_tree.c"
+	"${LIBFDT_PATH}/fdt_addresses.c"
+	"${LIBFDT_PATH}/fdt_overlay.c"
+	"${LIBFDT_PATH}/fdt_check.c"
+)
+
+target_include_directories(${TGT} PRIVATE ${LIBFDT_PATH})