diff --git a/boards/arm/xmc4/xmc4500-relax/include/board.h b/boards/arm/xmc4/xmc4500-relax/include/board.h
index f847d31850..924ba96b7b 100644
--- a/boards/arm/xmc4/xmc4500-relax/include/board.h
+++ b/boards/arm/xmc4/xmc4500-relax/include/board.h
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4500-relax/include/board.h
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4500-relax/scripts/Make.defs b/boards/arm/xmc4/xmc4500-relax/scripts/Make.defs
index 39f953d74d..e28f08b76c 100644
--- a/boards/arm/xmc4/xmc4500-relax/scripts/Make.defs
+++ b/boards/arm/xmc4/xmc4500-relax/scripts/Make.defs
@@ -1,6 +1,8 @@
 ############################################################################
 # boards/arm/xmc4/xmc4500-relax/scripts/Make.defs
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 # Licensed to the Apache Software Foundation (ASF) under one or more
 # contributor license agreements.  See the NOTICE file distributed with
 # this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4500-relax/scripts/flash.ld b/boards/arm/xmc4/xmc4500-relax/scripts/flash.ld
index 6e67ff94bb..a5af38601c 100644
--- a/boards/arm/xmc4/xmc4500-relax/scripts/flash.ld
+++ b/boards/arm/xmc4/xmc4500-relax/scripts/flash.ld
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4500-relax/scripts/flash.ld
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4500-relax/src/Makefile b/boards/arm/xmc4/xmc4500-relax/src/Makefile
index 05d500d715..f90c385b5b 100644
--- a/boards/arm/xmc4/xmc4500-relax/src/Makefile
+++ b/boards/arm/xmc4/xmc4500-relax/src/Makefile
@@ -1,6 +1,8 @@
 ############################################################################
 # boards/arm/xmc4/xmc4500-relax/src/Makefile
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 # Licensed to the Apache Software Foundation (ASF) under one or more
 # contributor license agreements.  See the NOTICE file distributed with
 # this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4500-relax/src/xmc4500-relax.h b/boards/arm/xmc4/xmc4500-relax/src/xmc4500-relax.h
index 60fbd46874..816ded321a 100644
--- a/boards/arm/xmc4/xmc4500-relax/src/xmc4500-relax.h
+++ b/boards/arm/xmc4/xmc4500-relax/src/xmc4500-relax.h
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4500-relax/src/xmc4500-relax.h
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4500-relax/src/xmc4_appinit.c b/boards/arm/xmc4/xmc4500-relax/src/xmc4_appinit.c
index 595ed17f6b..a2291bd254 100644
--- a/boards/arm/xmc4/xmc4500-relax/src/xmc4_appinit.c
+++ b/boards/arm/xmc4/xmc4500-relax/src/xmc4_appinit.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4500-relax/src/xmc4_appinit.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4500-relax/src/xmc4_autoleds.c b/boards/arm/xmc4/xmc4500-relax/src/xmc4_autoleds.c
index e13ea3c692..f110e16f06 100644
--- a/boards/arm/xmc4/xmc4500-relax/src/xmc4_autoleds.c
+++ b/boards/arm/xmc4/xmc4500-relax/src/xmc4_autoleds.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4500-relax/src/xmc4_autoleds.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4500-relax/src/xmc4_boot.c b/boards/arm/xmc4/xmc4500-relax/src/xmc4_boot.c
index 5dce7a7e6f..4f07583ff6 100644
--- a/boards/arm/xmc4/xmc4500-relax/src/xmc4_boot.c
+++ b/boards/arm/xmc4/xmc4500-relax/src/xmc4_boot.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4500-relax/src/xmc4_boot.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4500-relax/src/xmc4_bringup.c b/boards/arm/xmc4/xmc4500-relax/src/xmc4_bringup.c
index 47e94884e6..8967f54cc5 100644
--- a/boards/arm/xmc4/xmc4500-relax/src/xmc4_bringup.c
+++ b/boards/arm/xmc4/xmc4500-relax/src/xmc4_bringup.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4500-relax/src/xmc4_bringup.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4500-relax/src/xmc4_buttons.c b/boards/arm/xmc4/xmc4500-relax/src/xmc4_buttons.c
index 77d711dff4..988b376e0d 100644
--- a/boards/arm/xmc4/xmc4500-relax/src/xmc4_buttons.c
+++ b/boards/arm/xmc4/xmc4500-relax/src/xmc4_buttons.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4500-relax/src/xmc4_buttons.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4500-relax/src/xmc4_max6675.c b/boards/arm/xmc4/xmc4500-relax/src/xmc4_max6675.c
index aa6ed4eb1d..9db8929553 100644
--- a/boards/arm/xmc4/xmc4500-relax/src/xmc4_max6675.c
+++ b/boards/arm/xmc4/xmc4500-relax/src/xmc4_max6675.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4500-relax/src/xmc4_max6675.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4500-relax/src/xmc4_spi.c b/boards/arm/xmc4/xmc4500-relax/src/xmc4_spi.c
index 7389388e82..6ce471e5c8 100644
--- a/boards/arm/xmc4/xmc4500-relax/src/xmc4_spi.c
+++ b/boards/arm/xmc4/xmc4500-relax/src/xmc4_spi.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4500-relax/src/xmc4_spi.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4500-relax/src/xmc4_userleds.c b/boards/arm/xmc4/xmc4500-relax/src/xmc4_userleds.c
index dcd3c1a98f..16ac03a7f5 100644
--- a/boards/arm/xmc4/xmc4500-relax/src/xmc4_userleds.c
+++ b/boards/arm/xmc4/xmc4500-relax/src/xmc4_userleds.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4500-relax/src/xmc4_userleds.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4700-relax/include/board.h b/boards/arm/xmc4/xmc4700-relax/include/board.h
index 9fa315644a..81fd2a0583 100644
--- a/boards/arm/xmc4/xmc4700-relax/include/board.h
+++ b/boards/arm/xmc4/xmc4700-relax/include/board.h
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4700-relax/include/board.h
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4700-relax/scripts/Make.defs b/boards/arm/xmc4/xmc4700-relax/scripts/Make.defs
index 206e3f1d39..5d84f92910 100644
--- a/boards/arm/xmc4/xmc4700-relax/scripts/Make.defs
+++ b/boards/arm/xmc4/xmc4700-relax/scripts/Make.defs
@@ -1,6 +1,8 @@
 ############################################################################
 # boards/arm/xmc4/xmc4700-relax/scripts/Make.defs
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 # Licensed to the Apache Software Foundation (ASF) under one or more
 # contributor license agreements.  See the NOTICE file distributed with
 # this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4700-relax/scripts/flash.ld b/boards/arm/xmc4/xmc4700-relax/scripts/flash.ld
index 9536a772fb..a77a6895ac 100644
--- a/boards/arm/xmc4/xmc4700-relax/scripts/flash.ld
+++ b/boards/arm/xmc4/xmc4700-relax/scripts/flash.ld
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4700-relax/scripts/flash.ld
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4700-relax/src/Makefile b/boards/arm/xmc4/xmc4700-relax/src/Makefile
index 6abe5359a3..2f987bd31c 100644
--- a/boards/arm/xmc4/xmc4700-relax/src/Makefile
+++ b/boards/arm/xmc4/xmc4700-relax/src/Makefile
@@ -1,6 +1,8 @@
 ############################################################################
 # boards/arm/xmc4/xmc4700-relax/src/Makefile
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 # Licensed to the Apache Software Foundation (ASF) under one or more
 # contributor license agreements.  See the NOTICE file distributed with
 # this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4700-relax/src/xmc4700-relax.h b/boards/arm/xmc4/xmc4700-relax/src/xmc4700-relax.h
index 713c72e31e..bb8583b982 100644
--- a/boards/arm/xmc4/xmc4700-relax/src/xmc4700-relax.h
+++ b/boards/arm/xmc4/xmc4700-relax/src/xmc4700-relax.h
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4700-relax/src/xmc4700-relax.h
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4700-relax/src/xmc4_appinit.c b/boards/arm/xmc4/xmc4700-relax/src/xmc4_appinit.c
index 711aea89b2..b1e87c9876 100644
--- a/boards/arm/xmc4/xmc4700-relax/src/xmc4_appinit.c
+++ b/boards/arm/xmc4/xmc4700-relax/src/xmc4_appinit.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4700-relax/src/xmc4_appinit.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4700-relax/src/xmc4_autoleds.c b/boards/arm/xmc4/xmc4700-relax/src/xmc4_autoleds.c
index 49aa7068fd..0ea3881e3f 100644
--- a/boards/arm/xmc4/xmc4700-relax/src/xmc4_autoleds.c
+++ b/boards/arm/xmc4/xmc4700-relax/src/xmc4_autoleds.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4700-relax/src/xmc4_autoleds.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4700-relax/src/xmc4_boot.c b/boards/arm/xmc4/xmc4700-relax/src/xmc4_boot.c
index 92b772d153..c3f61078ae 100644
--- a/boards/arm/xmc4/xmc4700-relax/src/xmc4_boot.c
+++ b/boards/arm/xmc4/xmc4700-relax/src/xmc4_boot.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4700-relax/src/xmc4_boot.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4700-relax/src/xmc4_bringup.c b/boards/arm/xmc4/xmc4700-relax/src/xmc4_bringup.c
index 23767c17b3..daedfd5ed8 100644
--- a/boards/arm/xmc4/xmc4700-relax/src/xmc4_bringup.c
+++ b/boards/arm/xmc4/xmc4700-relax/src/xmc4_bringup.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4700-relax/src/xmc4_bringup.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4700-relax/src/xmc4_buttons.c b/boards/arm/xmc4/xmc4700-relax/src/xmc4_buttons.c
index 8f1ed96ff5..970f8162e7 100644
--- a/boards/arm/xmc4/xmc4700-relax/src/xmc4_buttons.c
+++ b/boards/arm/xmc4/xmc4700-relax/src/xmc4_buttons.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4700-relax/src/xmc4_buttons.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4700-relax/src/xmc4_spi.c b/boards/arm/xmc4/xmc4700-relax/src/xmc4_spi.c
index 56f4d257a8..acc90d2bbb 100644
--- a/boards/arm/xmc4/xmc4700-relax/src/xmc4_spi.c
+++ b/boards/arm/xmc4/xmc4700-relax/src/xmc4_spi.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4700-relax/src/xmc4_spi.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4700-relax/src/xmc4_userleds.c b/boards/arm/xmc4/xmc4700-relax/src/xmc4_userleds.c
index 32a0198779..6f9cc73202 100644
--- a/boards/arm/xmc4/xmc4700-relax/src/xmc4_userleds.c
+++ b/boards/arm/xmc4/xmc4700-relax/src/xmc4_userleds.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4700-relax/src/xmc4_userleds.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4800-relax/include/board.h b/boards/arm/xmc4/xmc4800-relax/include/board.h
index e3af15469f..8eb6e5742f 100644
--- a/boards/arm/xmc4/xmc4800-relax/include/board.h
+++ b/boards/arm/xmc4/xmc4800-relax/include/board.h
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4800-relax/include/board.h
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4800-relax/scripts/Make.defs b/boards/arm/xmc4/xmc4800-relax/scripts/Make.defs
index 2de14ea75b..c9a341d7c9 100644
--- a/boards/arm/xmc4/xmc4800-relax/scripts/Make.defs
+++ b/boards/arm/xmc4/xmc4800-relax/scripts/Make.defs
@@ -1,6 +1,8 @@
 ############################################################################
 # boards/arm/xmc4/xmc4800-relax/scripts/Make.defs
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 # Licensed to the Apache Software Foundation (ASF) under one or more
 # contributor license agreements.  See the NOTICE file distributed with
 # this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4800-relax/scripts/flash.ld b/boards/arm/xmc4/xmc4800-relax/scripts/flash.ld
index 0b3bdd3804..6534fa776a 100644
--- a/boards/arm/xmc4/xmc4800-relax/scripts/flash.ld
+++ b/boards/arm/xmc4/xmc4800-relax/scripts/flash.ld
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4800-relax/scripts/flash.ld
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4800-relax/src/CMakeLists.txt b/boards/arm/xmc4/xmc4800-relax/src/CMakeLists.txt
index 709b4c9c0c..372e441e3c 100644
--- a/boards/arm/xmc4/xmc4800-relax/src/CMakeLists.txt
+++ b/boards/arm/xmc4/xmc4800-relax/src/CMakeLists.txt
@@ -1,6 +1,8 @@
 # ##############################################################################
 # boards/arm/xmc4/xmc4800-relax/src/CMakeLists.txt
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 # Licensed to the Apache Software Foundation (ASF) under one or more contributor
 # license agreements.  See the NOTICE file distributed with this work for
 # additional information regarding copyright ownership.  The ASF licenses this
diff --git a/boards/arm/xmc4/xmc4800-relax/src/Makefile b/boards/arm/xmc4/xmc4800-relax/src/Makefile
index 2138d5de4a..dd5721f8ff 100644
--- a/boards/arm/xmc4/xmc4800-relax/src/Makefile
+++ b/boards/arm/xmc4/xmc4800-relax/src/Makefile
@@ -1,6 +1,8 @@
 ############################################################################
 # boards/arm/xmc4/xmc4800-relax/src/Makefile
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 # Licensed to the Apache Software Foundation (ASF) under one or more
 # contributor license agreements.  See the NOTICE file distributed with
 # this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4800-relax/src/xmc4800-relax.h b/boards/arm/xmc4/xmc4800-relax/src/xmc4800-relax.h
index e47b8cab83..0317bbeeb6 100644
--- a/boards/arm/xmc4/xmc4800-relax/src/xmc4800-relax.h
+++ b/boards/arm/xmc4/xmc4800-relax/src/xmc4800-relax.h
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4800-relax/src/xmc4800-relax.h
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4800-relax/src/xmc4_appinit.c b/boards/arm/xmc4/xmc4800-relax/src/xmc4_appinit.c
index 0e18b041b2..31fbafcc1a 100644
--- a/boards/arm/xmc4/xmc4800-relax/src/xmc4_appinit.c
+++ b/boards/arm/xmc4/xmc4800-relax/src/xmc4_appinit.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4800-relax/src/xmc4_appinit.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4800-relax/src/xmc4_autoleds.c b/boards/arm/xmc4/xmc4800-relax/src/xmc4_autoleds.c
index 683bc786a5..70ce39e97c 100644
--- a/boards/arm/xmc4/xmc4800-relax/src/xmc4_autoleds.c
+++ b/boards/arm/xmc4/xmc4800-relax/src/xmc4_autoleds.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4800-relax/src/xmc4_autoleds.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4800-relax/src/xmc4_boot.c b/boards/arm/xmc4/xmc4800-relax/src/xmc4_boot.c
index c46af6332d..7910a20151 100644
--- a/boards/arm/xmc4/xmc4800-relax/src/xmc4_boot.c
+++ b/boards/arm/xmc4/xmc4800-relax/src/xmc4_boot.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4800-relax/src/xmc4_boot.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4800-relax/src/xmc4_bringup.c b/boards/arm/xmc4/xmc4800-relax/src/xmc4_bringup.c
index 97ea35c150..22a6b656cf 100644
--- a/boards/arm/xmc4/xmc4800-relax/src/xmc4_bringup.c
+++ b/boards/arm/xmc4/xmc4800-relax/src/xmc4_bringup.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4800-relax/src/xmc4_bringup.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4800-relax/src/xmc4_buttons.c b/boards/arm/xmc4/xmc4800-relax/src/xmc4_buttons.c
index dc997bbd1a..20f7428790 100644
--- a/boards/arm/xmc4/xmc4800-relax/src/xmc4_buttons.c
+++ b/boards/arm/xmc4/xmc4800-relax/src/xmc4_buttons.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4800-relax/src/xmc4_buttons.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4800-relax/src/xmc4_spi.c b/boards/arm/xmc4/xmc4800-relax/src/xmc4_spi.c
index 9923f119dc..ad969e407d 100644
--- a/boards/arm/xmc4/xmc4800-relax/src/xmc4_spi.c
+++ b/boards/arm/xmc4/xmc4800-relax/src/xmc4_spi.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4800-relax/src/xmc4_spi.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/arm/xmc4/xmc4800-relax/src/xmc4_userleds.c b/boards/arm/xmc4/xmc4800-relax/src/xmc4_userleds.c
index a4cdac0d49..8acfdc5451 100644
--- a/boards/arm/xmc4/xmc4800-relax/src/xmc4_userleds.c
+++ b/boards/arm/xmc4/xmc4800-relax/src/xmc4_userleds.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/arm/xmc4/xmc4800-relax/src/xmc4_userleds.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The