diff --git a/os/ports/GCC/ARM/rules.mk b/os/ports/GCC/ARM/rules.mk
deleted file mode 100644
index 5e8b8e971..000000000
--- a/os/ports/GCC/ARM/rules.mk
+++ /dev/null
@@ -1,146 +0,0 @@
-# ARM7 common makefile scripts and rules.
-
-# Output
-OUTFILES = $(BUILDDIR)/$(PROJECT).elf $(BUILDDIR)/$(PROJECT).hex $(BUILDDIR)/$(PROJECT).bin $(BUILDDIR)/$(PROJECT).dmp
-ifeq ($(BUILDDIR),)
-  BUILDDIR = .
-  CLEANDIR =
-else
-  CLEANDIR = $(BUILDDIR)
-endif
-ENSUREBUILDDIR = $(shell test -d $(BUILDDIR) || mkdir $(BUILDDIR))
-
-# Automatic compiler options
-OPT = $(USE_OPT)
-CPPOPT = $(USE_CPPOPT)
-ifeq ($(USE_CURRP_CACHING),yes)
-  OPT += -ffixed-r7 -DCH_CURRP_REGISTER_CACHE='"r7"'
-endif
-ifeq ($(USE_LINK_GC),yes)
-  OPT += -ffunction-sections -fdata-sections
-endif
-
-# Source files groups
-ifeq ($(USE_THUMB),yes)
-  TCSRC += $(CSRC)
-  TCPPSRC += $(CPPSRC)
-else
-  ACSRC += $(CSRC)
-  ACPPSRC += $(CPPSRC)
-endif
-ASRC	 = $(ACSRC)$(ACPPSRC)
-TSRC	 = $(TCSRC)$(TCPPSRC)
-SRC	     = $(ASRC)$(TSRC)
-
-# Object files groups
-ACOBJS   = $(ACSRC:.c=.o)
-ACPPOBJS = $(ACPPSRC:.cpp=.o)
-TCOBJS   = $(TCSRC:.c=.o)
-TCPPOBJS = $(TCPPSRC:.cpp=.o)
-ASMOBJS  = $(ASMSRC:.s=.o)
-OBJS	 = $(ASMOBJS) $(ACOBJS) $(TCOBJS) $(ACPPOBJS) $(TCPPOBJS)
-
-# Paths
-IINCDIR = $(patsubst %,-I%,$(INCDIR) $(DINCDIR) $(UINCDIR))
-LLIBDIR = $(patsubst %,-L%,$(DLIBDIR) $(ULIBDIR))
-
-# Macros
-DEFS    = $(DDEFS) $(UDEFS)
-ADEFS   = $(DADEFS) $(UADEFS)
-
-# Libs
-LIBS    = $(DLIBS) $(ULIBS)
-
-# Various settings
-MCFLAGS = -mcpu=$(MCU)
-ODFLAGS	= -x --syms
-ASFLAGS = $(MCFLAGS) -Wa,-amhls=$(<:.s=.lst) $(ADEFS)
-CFLAGS   = $(MCFLAGS) $(OPT) $(CWARN) -Wa,-alms=$(<:.c=.lst) $(DEFS)
-CPPFLAGS = $(MCFLAGS) $(OPT) $(CPPOPT) $(CPPWARN) -Wa,-alms=$(<:.cpp=.lst) $(DEFS)
-ifeq ($(USE_LINK_GC),yes)
-  LDFLAGS = $(MCFLAGS) -nostartfiles -T$(LDSCRIPT) -Wl,-Map=$(BUILDDIR)/$(PROJECT).map,--cref,--no-warn-mismatch,--gc-sections $(LLIBDIR)
-else
-  LDFLAGS = $(MCFLAGS) -nostartfiles -T$(LDSCRIPT) -Wl,-Map=$(BUILDDIR)/$(PROJECT).map,--cref,--no-warn-mismatch $(LLIBDIR)
-endif
-
-# Thumb interwork enabled only if needed because it kills performance.
-ifneq ($(TSRC),)
-  CFLAGS += -DTHUMB_PRESENT
-  CPPFLAGS += -DTHUMB_PRESENT
-  ASFLAGS += -DTHUMB_PRESENT
-  ifneq ($(ASRC),)
-    # Mixed ARM and THUMB mode.
-    CFLAGS += -mthumb-interwork
-    CPPFLAGS += -mthumb-interwork
-    ASFLAGS += -mthumb-interwork
-    LDFLAGS += -mthumb-interwork
-  else
-    # Pure THUMB mode, THUMB C code cannot be called by ARM asm code directly.
-    CFLAGS += -mno-thumb-interwork -DTHUMB_NO_INTERWORKING
-    CPPFLAGS += -mno-thumb-interwork -DTHUMB_NO_INTERWORKING
-    ASFLAGS += -mno-thumb-interwork -DTHUMB_NO_INTERWORKING -mthumb
-    LDFLAGS += -mno-thumb-interwork -mthumb
-  endif
-else
-  # Pure ARM mode
-  CFLAGS += -mno-thumb-interwork
-  CPPFLAGS += -mno-thumb-interwork
-  ASFLAGS += -mno-thumb-interwork
-  LDFLAGS += -mno-thumb-interwork
-endif
-
-# Generate dependency information
-CFLAGS += -MD -MP -MF .dep/$(@F).d
-CPPFLAGS += -MD -MP -MF .dep/$(@F).d
-
-#
-# Makefile rules
-#
-
-all: $(ENSUREBUILDDIR) $(OBJS) $(OUTFILES)
-
-$(ACPPOBJS) : %.o : %.cpp
-	@echo
-	$(CPPC) -c $(CPPFLAGS) $(AOPT) -I . $(IINCDIR) $< -o $@
-
-$(TCPPOBJS) : %.o : %.cpp
-	@echo
-	$(CPPC) -c $(CPPFLAGS) $(TOPT) -I . $(IINCDIR) $< -o $@
-
-$(ACOBJS) : %.o : %.c
-	@echo
-	$(CC) -c $(CFLAGS) $(AOPT) -I . $(IINCDIR) $< -o $@
-
-$(TCOBJS) : %.o : %.c
-	@echo
-	$(CC) -c $(CFLAGS) $(TOPT) -I . $(IINCDIR) $< -o $@
-
-$(ASMOBJS) : %.o : %.s
-	@echo
-	$(AS) -c $(ASFLAGS) -I . $(IINCDIR) $< -o $@
-
-%elf: $(OBJS)
-	@echo
-	$(LD) $(OBJS) $(LDFLAGS) $(LIBS) -o $@
-
-%hex: %elf
-	$(HEX) $< $@
-
-%bin: %elf
-	$(BIN) $< $@
-
-%dmp: %elf
-	$(OD) $(ODFLAGS) $< > $@
-
-clean:
-	-rm -f $(OBJS)
-	-rm -f $(ACSRC:.c=.lst) $(TCSRC:.c=.lst) $(ACPPSRC:.cpp=.lst) $(TCPPSRC:.cpp=.lst) $(ASMSRC:.s=.lst)
-	-rm -f $(OUTFILES) $(BUILDDIR)/$(PROJECT).map
-	-rm -fR .dep $(CLEANDIR)
-
-#
-# Include the dependency files, should be the last of the makefile
-#
--include $(shell mkdir .dep 2>/dev/null) $(wildcard .dep/*)
-
-# *** EOF ***