diff --git a/boards/arm/xmc4/xmc4500-relax/include/board.h b/boards/arm/xmc4/xmc4500-relax/include/board.h
index f847d31850b..924ba96b7b1 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 39f953d74d9..e28f08b76ce 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 6e67ff94bbe..a5af38601c7 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 05d500d715a..f90c385b5b5 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 60fbd46874a..816ded321a6 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 595ed17f6ba..a2291bd254c 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 e13ea3c6925..f110e16f06e 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 5dce7a7e6fb..4f07583ff68 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 47e94884e63..8967f54cc5c 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 77d711dff46..988b376e0d7 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 aa6ed4eb1da..9db8929553d 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 7389388e820..6ce471e5c81 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 dcd3c1a98f5..16ac03a7f50 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 9fa315644ab..81fd2a05838 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 206e3f1d398..5d84f92910a 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 9536a772fb7..a77a6895ac8 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 6abe5359a3b..2f987bd31cf 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 713c72e31e6..bb8583b9826 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 711aea89b26..b1e87c9876b 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 49aa7068fd1..0ea3881e3f6 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 92b772d153e..c3f61078aea 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 23767c17b37..daedfd5ed81 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 8f1ed96ff56..970f8162e72 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 56f4d257a8e..acc90d2bbba 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 32a01987794..6f9cc73202f 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 e3af15469f3..8eb6e5742f7 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 2de14ea75bb..c9a341d7c9c 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 0b3bdd38046..6534fa776a1 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 709b4c9c0ca..372e441e3cd 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 2138d5de4a3..dd5721f8ff5 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 e47b8cab839..0317bbeeb68 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 0e18b041b24..31fbafcc1a3 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 683bc786a5c..70ce39e97cb 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 c46af6332da..7910a201514 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 97ea35c1501..22a6b656cfd 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 dc997bbd1a6..20f7428790c 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 9923f119dcc..ad969e407de 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 a4cdac0d494..8acfdc54519 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