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diff --git a/tools/gmake_scripts/os_chibios_2.mk b/tools/gmake_scripts/os_chibios_2.mk
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+++ b/tools/gmake_scripts/os_chibios_2.mk
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+#
+# This file is subject to the terms of the GFX License. If a copy of
+# the license was not distributed with this file, you can obtain one at:
+#
+#             http://ugfx.org/license.html
+#
+
+# See readme.txt for the make API
+
+# Requirements:
+#
+# CHIBIOS                       The location of the ChibiOS code    eg. CHIBIOS = ../chibios
+# CHIBIOS_PLATFORM              The name of the ChibiOS platform    eg. CHIBIOS_PLATFORM = AT91SAM7
+# CHIBIOS_PORT                  The name of the ChibiOS port    eg. CHIBIOS_PORT = GCC/ARM/AT91SAM7
+#
+
+# Optional:
+#
+# CHIBIOS_LDSCRIPT              The name of the loader script    eg. CHIBIOS_LDSCRIPT = AT91SAM7X256.ld
+# CHIBIOS_BOARD                 The name of the ChibiOS board    eg. CHIBIOS_BOARD = OLIMEX_SAM7_EX256 - if not specified you must include equivalent code yourself
+# CHIBIOS_VERSION               Which version of ChibiOS is this (2 or 3) - default is 3
+# CHIBIOS_STM32LIB              Use the STM32 library source for drivers instead of native drivers (yes or no) - default no
+# CHIBIOS_PROCESS_STACKSIZE     Size of the ChibiOS process stack. Only useful if the link script supports it - default is 0x400
+# CHIBIOS_EXCEPTIONS_STACKSIZE  Size of the ChibiOS exceptopms stack. Only useful if the link script supports it - default is 0x400
+#
+
+PATHLIST += CHIBIOS
+
+include $(CHIBIOS)/os/hal/hal.mk
+include $(CHIBIOS)/os/hal/platforms/$(CHIBIOS_PLATFORM)/platform.mk
+include $(CHIBIOS)/os/kernel/kernel.mk
+include $(CHIBIOS)/os/ports/$(CHIBIOS_PORT)/port.mk
+ifneq ($(CHIBIOS_BOARD),)
+  include $(CHIBIOS)/boards/$(CHIBIOS_BOARD)/board.mk
+endif
+
+ifeq ($(LDSCRIPT),)
+  ifneq ($(CHIBIOS_LDSCRIPT),)
+    LDSCRIPT= $(PORTLD)/$(CHIBIOS_LDSCRIPT)
+  endif
+endif
+
+ifneq ($(LDSCRIPT),)
+  ifeq ($(CHIBIOS_PROCESS_STACKSIZE),)
+    LDFLAGS += -Wl,--defsym=__process_stack_size__=0x400
+  else
+    LDFLAGS += -Wl,--defsym=__process_stack_size__=$(CHIBIOS_PROCESS_STACKSIZE)
+  endif
+  ifeq ($(CHIBIOS_EXCEPTIONS_STACKSIZE),)
+    LDFLAGS += -Wl,--defsym=__main_stack_size__=0x400
+  else
+    LDFLAGS += -Wl,--defsym=__main_stack_size__=$(CHIBIOS_EXCEPTIONS_STACKSIZE)
+  endif
+endif
+
+ifeq ($(CHIBIOS_STM32LIB),yes)
+  include $(CHIBIOS)/ext/stm32lib/stm32lib.mk
+  SRC     += $(STM32SRC)
+  DEFS    += USE_STDPERIPH_DRIVER
+  INCPATH += $(STM32INC)
+endif
+
+INCPATH += $(PORTINC) $(KERNINC) $(OSALINC) \
+           $(HALINC) $(PLATFORMINC) $(BOARDINC)
+
+SRC  += $(PORTSRC) \
+        $(KERNSRC) \
+        $(HALSRC) \
+        $(PLATFORMSRC) \
+        $(BOARDSRC) \
+        $(OSALSRC) \
+        $(PORTASM)