diff --git a/boards/arduino-zero/Makefile.include b/boards/arduino-zero/Makefile.include
index d8a948a807..711af3ea92 100644
--- a/boards/arduino-zero/Makefile.include
+++ b/boards/arduino-zero/Makefile.include
@@ -2,24 +2,4 @@
 export CPU = samd21
 export CPU_MODEL = samd21g18a
 
-# set default port depending on operating system
-export PORT_LINUX ?= /dev/ttyACM0
-export PORT_DARWIN ?= $(firstword $(sort $(wildcard /dev/tty.usbmodem*)))
-
-# setup serial terminal
-include $(RIOTMAKE)/tools/serial.inc.mk
-
-# Add board selector (USB serial) to OpenOCD options if specified.
-# Use /dist/tools/usb-serial/list-ttys.sh to find out serial number.
-#   Usage: SERIAL="<SERIAL>" BOARD="arduino-zero" make flash
-ifneq (,$(SERIAL))
-    export OPENOCD_EXTRA_INIT += "-c cmsis_dap_serial $(SERIAL)"
-    SERIAL_TTY = $(shell $(RIOTBASE)/dist/tools/usb-serial/find-tty.sh $(SERIAL))
-    ifeq (,$(SERIAL_TTY))
-        $(error Did not find a device with serial $(SERIAL))
-    endif
-    PORT_LINUX := $(SERIAL_TTY)
-endif
-
-# this board uses openocd
-include $(RIOTMAKE)/tools/openocd.inc.mk
+include $(RIOTMAKE)/boards/sam0.inc.mk
diff --git a/boards/samd21-xpro/Makefile.include b/boards/samd21-xpro/Makefile.include
index e8415c937e..06056fc464 100644
--- a/boards/samd21-xpro/Makefile.include
+++ b/boards/samd21-xpro/Makefile.include
@@ -2,24 +2,4 @@
 export CPU = samd21
 export CPU_MODEL = samd21j18a
 
-# set default port depending on operating system
-PORT_LINUX ?= /dev/ttyACM0
-PORT_DARWIN ?= $(firstword $(sort $(wildcard /dev/tty.usbmodem*)))
-
-# setup serial terminal
-include $(RIOTMAKE)/tools/serial.inc.mk
-
-# Add board selector (USB serial) to OpenOCD options if specified.
-# Use /dist/tools/usb-serial/list-ttys.sh to find out serial number.
-#   Usage: SERIAL="ATML..." BOARD="samd21-xpro" make flash
-ifneq (,$(SERIAL))
-    export OPENOCD_EXTRA_INIT += "-c cmsis_dap_serial $(SERIAL)"
-    SERIAL_TTY = $(firstword $(shell $(RIOTBASE)/dist/tools/usb-serial/find-tty.sh $(SERIAL)))
-    ifeq (,$(SERIAL_TTY))
-        $(error Did not find a device with serial $(SERIAL))
-    endif
-    PORT_LINUX := $(SERIAL_TTY)
-endif
-
-# this board uses openocd
-include $(RIOTMAKE)/tools/openocd.inc.mk
+include $(RIOTMAKE)/boards/sam0.inc.mk
diff --git a/boards/saml21-xpro/Makefile.include b/boards/saml21-xpro/Makefile.include
index c96d71bec7..d705e25f3b 100644
--- a/boards/saml21-xpro/Makefile.include
+++ b/boards/saml21-xpro/Makefile.include
@@ -3,9 +3,4 @@ export CPU = saml21
 export CPU_MODEL = saml21j18a
 export CFLAGS += -D__SAML21J18A__
 
-# setup serial terminal
-PORT_LINUX ?= /dev/ttyACM0
-include $(RIOTMAKE)/tools/serial.inc.mk
-
-# this board uses openocd
-include $(RIOTMAKE)/tools/openocd.inc.mk
+include $(RIOTMAKE)/boards/sam0.inc.mk
diff --git a/boards/samr21-xpro/Makefile.include b/boards/samr21-xpro/Makefile.include
index 7f68e0eaa1..acc6ee400b 100644
--- a/boards/samr21-xpro/Makefile.include
+++ b/boards/samr21-xpro/Makefile.include
@@ -2,24 +2,4 @@
 export CPU = samd21
 export CPU_MODEL = samr21g18a
 
-# set default port depending on operating system
-PORT_LINUX ?= /dev/ttyACM0
-PORT_DARWIN ?= $(firstword $(sort $(wildcard /dev/tty.usbmodem*)))
-
-# setup serial terminal
-include $(RIOTMAKE)/tools/serial.inc.mk
-
-# Add board selector (USB serial) to OpenOCD options if specified.
-# Use /dist/tools/usb-serial/list-ttys.sh to find out serial number.
-#   Usage: SERIAL="ATML..." BOARD="samr21-xpro" make flash
-ifneq (,$(SERIAL))
-    export OPENOCD_EXTRA_INIT += "-c cmsis_dap_serial $(SERIAL)"
-    SERIAL_TTY = $(firstword $(shell $(RIOTBASE)/dist/tools/usb-serial/find-tty.sh $(SERIAL)))
-    ifeq (,$(SERIAL_TTY))
-        $(error Did not find a device with serial $(SERIAL))
-    endif
-    PORT_LINUX := $(SERIAL_TTY)
-endif
-
-# this board uses openocd
-include $(RIOTMAKE)/tools/openocd.inc.mk
+include $(RIOTMAKE)/boards/sam0.inc.mk
diff --git a/boards/sodaq-autonomo/Makefile.include b/boards/sodaq-autonomo/Makefile.include
index 83eb6a0314..c6121dd6e3 100644
--- a/boards/sodaq-autonomo/Makefile.include
+++ b/boards/sodaq-autonomo/Makefile.include
@@ -2,26 +2,4 @@
 export CPU = samd21
 export CPU_MODEL = samd21j18a
 
-# set default port depending on operating system
-PORT_LINUX ?= /dev/ttyACM0
-PORT_DARWIN ?= $(firstword $(sort $(wildcard /dev/tty.usbmodem*)))
-
-export OFLAGS = -O binary
-
-# setup serial terminal
-include $(RIOTMAKE)/tools/serial.inc.mk
-
-# Add board selector (USB serial) to OpenOCD options if specified.
-# Use /dist/tools/usb-serial/list-ttys.sh to find out serial number.
-#   Usage: SERIAL="AAA..." BOARD="sodaq-autonomo" make flash
-ifneq (,$(SERIAL))
-    export OPENOCD_EXTRA_INIT += "-c cmsis_dap_serial $(SERIAL)"
-    SERIAL_TTY = $(shell $(RIOTBASE)/dist/tools/usb-serial/find-tty.sh $(SERIAL))
-    ifeq (,$(SERIAL_TTY))
-        $(error Did not find a device with serial $(SERIAL))
-    endif
-    PORT_LINUX := $(SERIAL_TTY)
-endif
-
-# this board uses openocd
-include $(RIOTMAKE)/tools/openocd.inc.mk
+include $(RIOTMAKE)/boards/sam0.inc.mk
diff --git a/makefiles/boards/sam0.inc.mk b/makefiles/boards/sam0.inc.mk
new file mode 100644
index 0000000000..89a76ea42c
--- /dev/null
+++ b/makefiles/boards/sam0.inc.mk
@@ -0,0 +1,21 @@
+# set default port depending on operating system
+PORT_LINUX ?= /dev/ttyACM0
+PORT_DARWIN ?= $(firstword $(sort $(wildcard /dev/tty.usbmodem*)))
+
+# setup serial terminal
+include $(RIOTMAKE)/tools/serial.inc.mk
+
+# Add board selector (USB serial) to OpenOCD options if specified.
+# Use /dist/tools/usb-serial/list-ttys.sh to find out serial number.
+#   Usage: SERIAL="ATML..." BOARD=<board> make flash
+ifneq (,$(SERIAL))
+    export OPENOCD_EXTRA_INIT += "-c cmsis_dap_serial $(SERIAL)"
+    SERIAL_TTY = $(firstword $(shell $(RIOTBASE)/dist/tools/usb-serial/find-tty.sh $(SERIAL)))
+    ifeq (,$(SERIAL_TTY))
+        $(error Did not find a device with serial $(SERIAL))
+    endif
+    PORT_LINUX := $(SERIAL_TTY)
+endif
+
+# this board uses openocd
+include $(RIOTMAKE)/tools/openocd.inc.mk