diff --git a/tool/mbed/mk20d50m.mk b/tool/mbed/mk20d50m.mk
deleted file mode 100644
index e62e39d2..00000000
--- a/tool/mbed/mk20d50m.mk
+++ /dev/null
@@ -1,44 +0,0 @@
-# based on Makefile exported form mbed.org
-# see http://mbed.org/handbook/Exporting-to-GCC-ARM-Embedded
-
-CPU = -mcpu=cortex-m4 -mthumb
-
-CC_SYMBOLS += \
-	-DTARGET_K20D50M \
-	-DTARGET_M4 \
-	-DTARGET_CORTEX_M \
-	-DTARGET_Freescale \
-	-DTOOLCHAIN_GCC_ARM \
-	-DTOOLCHAIN_GCC \
-	-D__CORTEX_M4 \
-	-DARM_MATH_CM4 \
-	-D__MBED__=1
-
-OBJECTS += \
-	$(OBJDIR)/libraries/mbed/targets/cmsis/TARGET_Freescale/TARGET_K20D50M/TOOLCHAIN_GCC_ARM/startup_MK20D5.o \
-	$(OBJDIR)/libraries/mbed/targets/cmsis/TARGET_Freescale/TARGET_K20D50M/cmsis_nvic.o \
-	$(OBJDIR)/libraries/mbed/targets/cmsis/TARGET_Freescale/TARGET_K20D50M/system_MK20D5.o \
-	$(OBJDIR)/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_K20D50M/analogin_api.o \
-	$(OBJDIR)/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_K20D50M/gpio_api.o \
-	$(OBJDIR)/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_K20D50M/gpio_irq_api.o \
-	$(OBJDIR)/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_K20D50M/i2c_api.o \
-	$(OBJDIR)/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_K20D50M/pinmap.o \
-	$(OBJDIR)/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_K20D50M/port_api.o \
-	$(OBJDIR)/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_K20D50M/pwmout_api.o \
-	$(OBJDIR)/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_K20D50M/rtc_api.o \
-	$(OBJDIR)/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_K20D50M/serial_api.o \
-	$(OBJDIR)/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_K20D50M/sleep.o \
-	$(OBJDIR)/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_K20D50M/spi_api.o \
-	$(OBJDIR)/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_K20D50M/us_ticker.o
-
-INCLUDE_PATHS += \
-	-I$(MBED_DIR)/libraries/mbed/targets \
-	-I$(MBED_DIR)/libraries/mbed/targets/cmsis \
-	-I$(MBED_DIR)/libraries/mbed/targets/cmsis/TARGET_Freescale \
-	-I$(MBED_DIR)/libraries/mbed/targets/cmsis/TARGET_Freescale/TARGET_K20D50M \
-	-I$(MBED_DIR)/libraries/mbed/targets/cmsis/TARGET_Freescale/TARGET_K20D50M/TOOLCHAIN_GCC_ARM \
-	-I$(MBED_DIR)/libraries/mbed/targets/hal \
-	-I$(MBED_DIR)/libraries/mbed/targets/hal/TARGET_Freescale \
-	-I$(MBED_DIR)/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_K20D50M
-
-LINKER_SCRIPT = infinity.ld