diff --git a/config_cortex_m4.mk b/config_cortex_m4.mk
index 4521355..1a3b7ae 100644
--- a/config_cortex_m4.mk
+++ b/config_cortex_m4.mk
@@ -12,7 +12,7 @@
 
 
 #environment variables
-ARCH_CFLAGS = -mcpu=cortex-m4 -mthumb -mlittle-endian -mfpu=fpv4-sp-d16 -mfloat-abi=hard -fsingle-precision-constant
+ARCH_CFLAGS = -mcpu=cortex-m4+nofp -mthumb -mlittle-endian -mfloat-abi=soft -fsingle-precision-constant
 OPT_CFLAGS = -fdata-sections -ffunction-sections
 
 PLATFORM_CFLAGS = -Wno-unused-parameter -nostdinc -ffreestanding -fno-builtin -fsigned-char -fno-common -Wno-main -I$(shell $(CC) -print-search-dirs | $(AWK) '$$1 == "install:" {print $$NF}')include
diff --git a/config_cortex_m4f.mk b/config_cortex_m4f.mk
new file mode 100644
index 0000000..4521355
--- /dev/null
+++ b/config_cortex_m4f.mk
@@ -0,0 +1,62 @@
+TOOLCHAIN_PREFIX = /opt/gcc-arm-none-eabi/bin/arm-none-eabi-
+TOOLCHAIN_SUFFIX =
+
+CC = $(TOOLCHAIN_PREFIX)gcc$(TOOLCHAIN_SUFFIX)
+GDB = $(TOOLCHAIN_PREFIX)gdb$(TOOLCHAIN_SUFFIX)
+SIZE = $(TOOLCHAIN_PREFIX)size$(TOOLCHAIN_SUFFIX)
+OBJCOPY = $(TOOLCHAIN_PREFIX)objcopy$(TOOLCHAIN_SUFFIX)
+OBJDUMP = $(TOOLCHAIN_PREFIX)objdump$(TOOLCHAIN_SUFFIX)
+STRIP = $(TOOLCHAIN_PREFIX)strip$(TOOLCHAIN_SUFFIX)
+READELF = $(TOOLCHAIN_PREFIX)readelf$(TOOLCHAIN_SUFFIX)
+NM = $(TOOLCHAIN_PREFIX)nm$(TOOLCHAIN_SUFFIX)
+
+
+#environment variables
+ARCH_CFLAGS = -mcpu=cortex-m4 -mthumb -mlittle-endian -mfpu=fpv4-sp-d16 -mfloat-abi=hard -fsingle-precision-constant
+OPT_CFLAGS = -fdata-sections -ffunction-sections
+
+PLATFORM_CFLAGS = -Wno-unused-parameter -nostdinc -ffreestanding -fno-builtin -fsigned-char -fno-common -Wno-main -I$(shell $(CC) -print-search-dirs | $(AWK) '$$1 == "install:" {print $$NF}')include
+PLATFORM_CFLAGS += -DARM_MATH_CM4
+
+PLATFORM_CXXFLAGS = $(PLATFORM_CFLAGS)
+PLATFORM_LDFLAGS = -nostdlib -nostartfiles -nodefaultlibs -Wl,-static,-gc-sections
+
+
+define CONFIG_TARGETS
+
+ifdef LINK_TARGET
+
+.PHONY: link_target_size
+
+config_final_target: $(BINDIR)/$(TARGET_VER).hex $(BINDIR)/$(TARGET_VER).bin link_target_size $(BINDIR)/$(TARGET).lst $(BINDIR)/$(TARGET)_sym.rep
+
+$(BINDIR)/$(TARGET)_sym.rep: $(BINDIR)/$(LINK_TARGET) | $(BINDIR)/
+	$(NM) -t d -S --size-sort $(BINDIR)/$(LINK_TARGET) > $(BINDIR)/$(TARGET)_sym.rep
+	@echo
+	
+
+$(BINDIR)/$(TARGET).lst: $(BINDIR)/$(LINK_TARGET) | $(BINDIR)/
+	$(OBJDUMP) -xds -S -l $(BINDIR)/$(LINK_TARGET) > $(BINDIR)/$(TARGET).lst
+	@echo
+	
+
+link_target_size: $(BINDIR)/$(LINK_TARGET)
+	@$(SIZE) -A -d $(BINDIR)/$(LINK_TARGET)
+	@echo
+
+
+$(BINDIR)/$(TARGET_VER).bin: $(BINDIR)/$(LINK_TARGET) | $(BINDIR)/
+	$(OBJCOPY) -O binary $(BINDIR)/$(LINK_TARGET) $(BINDIR)/$(TARGET_VER).bin
+	@echo
+
+
+$(BINDIR)/$(TARGET_VER).hex: $(BINDIR)/$(LINK_TARGET) | $(BINDIR)/
+	$(OBJCOPY) -O ihex $(BINDIR)/$(LINK_TARGET) $(BINDIR)/$(TARGET_VER).hex
+	@echo
+	
+endif
+
+	
+endef
+
+include $(dir $(abspath $(lastword $(MAKEFILE_LIST))))/build.mk