diff --git a/os/rt/ports/ARMCMx/compilers/GCC/mk/port_k20x.mk b/os/rt/ports/ARMCMx/compilers/GCC/mk/port_k20x.mk
new file mode 100644
index 000000000..2947a2d4a
--- /dev/null
+++ b/os/rt/ports/ARMCMx/compilers/GCC/mk/port_k20x.mk
@@ -0,0 +1,15 @@
+# List of the ChibiOS/RT Cortex-M4 K20x port files.
+PORTSRC = $(CHIBIOS)/os/common/ports/ARMCMx/compilers/GCC/crt0.c \
+          $(CHIBIOS)/os/common/ports/ARMCMx/compilers/GCC/vectors.c \
+          ${CHIBIOS}/os/rt/ports/ARMCMx/chcore.c \
+          ${CHIBIOS}/os/rt/ports/ARMCMx/chcore_v7m.c
+
+PORTASM = $(CHIBIOS)/os/rt/ports/ARMCMx/compilers/GCC/chcoreasm_v7m.s
+
+PORTINC = ${CHIBIOS}/os/ext/CMSIS/include \
+          ${CHIBIOS}/os/ext/CMSIS/KINETIS \
+          ${CHIBIOS}/os/common/ports/ARMCMx/devices/K20x \
+          ${CHIBIOS}/os/rt/ports/ARMCMx \
+          ${CHIBIOS}/os/rt/ports/ARMCMx/compilers/GCC
+
+PORTLD  = ${CHIBIOS}/os/common/ports/ARMCMx/compilers/GCC/ld