SAMD Cortex M0 device support (Zero, MKR1000, etc)

Compilation improvements by adding variant as other obj but not working on device

Arduino Zero devices with OpenOCD working

Created ARM_TOOLS_DIR and define arm toolchain executables in Sam.mk

Check avr-gcc on last AVR_TOOLS_DIR detect and indenting formatting

GDB debugging and programming added

Documentation updates and define ARDMK_VENDOR rather than include Sam.mk

Expand all parse_boards when defined rather than when used

Trim extra defines regex working on both macOS and Linux but need better fix

Print USB ids and added debug usage to readme

Add note on Arduino package dir and made board.txt work

Do ARM ARDUINO_ARCH define in Arduino.mk]

Add MZeroBlink to non-testable examples for now

Remove \B from extra defines grep

Add ARDUINO_PACKAGE_DIR for board support files

Fix a typo in the README

Fix typo in arduino-mk-vars.md

Prevent re-including Arduino.mk from Sam.mk when make restarts for upload

Add catrina to ARD_REST_OPTS if/else

Remove realpath in Sam.mk for cygwin compatability

SAMD bootloader support in ard-reset using --zero

Enters bootloader using open/close of port at 1200 BAUD, then polls the
attached devices for new port enumerating (bootloader). This is how the
Arduino IDE operates

Bossa support for Zero, MKR1000 etc

Re-word Arm README section after Native USB development

Reset for zero refactored like IDE

Zero bootloader reset tested on macOS and comments added

Re-word ARM bootloader and remove imports from testing

Patch changes ARDMK_VENDOR->ARCHITECHTURE, show_config_vars, ignore CORE_VER if emtpy

Common.mk header guard, openocd/bossac avoid separator, typos

Documentation update for patch changes

Move ARM tools to Sam.mk and auto-detect include

Correct accidental commit of Blink Makefile change

Lib fix with alternative core and documentation

Append zero to ARD_RESET_OPTS rather than set

Prioritise package ARM upload tools over path installed

Add note in README on ARM tools versions

Move openocd variant config script flag to OPTS

1 files changed, 481 insertions, 0 deletions

diff --git a/Sam.mk b/Sam.mk
new file mode 100644
index 0000000..8b93ee4
--- /dev/null
+++ b/Sam.mk
@@ -0,0 +1,481 @@
+########################################################################
+#
+# Support for Arduino Atmel SAM boards (sam and samd)
+#
+# You must install a SAM board hardware support package (such as Arduino Zero)
+# to use this, then define ARDUINO_PACKAGE_DIR as the path to the root
+# directory containing the support package.
+#
+# 2018 John Whittington @j_whittington
+#
+########################################################################
+
+arduino_output =
+# When output is not suppressed and we're in the top-level makefile,
+# running for the first time (i.e., not after a restart after
+# regenerating the dependency file), then output the configuration.
+ifndef ARDUINO_QUIET
+    ifeq ($(MAKE_RESTARTS),)
+        ifeq ($(MAKELEVEL),0)
+            arduino_output = $(info $(1))
+        endif
+    endif
+endif
+
+ifndef ARDMK_DIR
+    ARDMK_DIR := $(realpath $(dir $(realpath $(lastword $(MAKEFILE_LIST)))))
+endif
+
+# include Common.mk now we know where it is
+ifndef COMMON_INCLUDED
+    include $(ARDMK_DIR)/Common.mk
+endif
+
+ifndef ARDUINO_PACKAGE_DIR
+    # attempt to find based on Linux, macOS and Windows default
+    ARDUINO_PACKAGE_DIR := $(firstword \
+        $(call dir_if_exists,$(HOME)/.arduino15/packages) \
+        $(call dir_if_exists,$(ARDUINO_DIR)/packages) \
+        $(call dir_if_exists,$(HOME)/Library/Arduino15/packages) \
+        $(call dir_if_exists,$(USERPROFILE)/AppData/Local/Arduino15/packages) )
+    $(call show_config_variable,ARDUINO_PACKAGE_DIR,[AUTODETECTED],(from DEFAULT))
+else
+    $(call show_config_variable,ARDUINO_PACKAGE_DIR,[USER])
+endif
+
+ifndef ARDMK_VENDOR
+    ARDMK_VENDOR := arduino
+endif
+
+ifndef ARCHITECTURE
+    ARCHITECTURE := samd
+endif
+
+ifndef CORE_VER
+    CORE_VER := $(wildcard $(ARDUINO_PACKAGE_DIR)/$(ARDMK_VENDOR)/hardware/$(ARCHITECTURE)/1.*)
+    ifdef CORE_VER
+        CORE_VER := $(shell basename $(CORE_VER))
+        $(call show_config_variable,CORE_VER,[AUTODETECTED],(from ARDUINO_PACKAGE_DIR))
+    endif
+else
+    $(call show_config_variable,CORE_VER,[USER])
+endif
+
+ifndef CMSIS_VER
+    CMSIS_VER := $(shell basename $(wildcard $(ARDUINO_PACKAGE_DIR)/$(ARDMK_VENDOR)/tools/CMSIS/4.*))
+    $(call show_config_variable,CMSIS_VER,[AUTODETECTED],(from ARDUINO_PACKAGE_DIR))
+else
+    $(call show_config_variable,CMSIS_VER,[USER])
+endif
+
+ifndef CMSIS_ATMEL_VER
+    CMSIS_ATMEL_VER := $(shell basename $(wildcard $(ARDUINO_PACKAGE_DIR)/$(ARDMK_VENDOR)/tools/CMSIS-Atmel/1.*))
+    $(call show_config_variable,CMSIS_ATMEL_VER,[AUTODETECTED],(from ARDUINO_PACKAGE_DIR))
+else
+    $(call show_config_variable,CMSIS_ATMEL_VER,[USER])
+endif
+
+ifndef CMSIS_DIR
+    CMSIS_DIR := $(ARDUINO_PACKAGE_DIR)/$(ARDMK_VENDOR)/tools/CMSIS/$(CMSIS_VER)/CMSIS
+    $(call show_config_variable,CMSIS_DIR,[AUTODETECTED],(from ARDUINO_PACKAGE_DIR))
+else
+    $(call show_config_variable,CMSIS_DIR,[USER])
+endif
+
+ifndef CMSIS_ATMEL_DIR
+    CMSIS_ATMEL_DIR := $(ARDUINO_PACKAGE_DIR)/$(ARDMK_VENDOR)/tools/CMSIS-Atmel/$(CMSIS_ATMEL_VER)/CMSIS
+    $(call show_config_variable,CMSIS_ATMEL_DIR,[AUTODETECTED],(from ARDUINO_PACKAGE_DIR))
+else
+    $(call show_config_variable,CMSIS_ATMEL_DIR,[USER])
+endif
+
+# Arduino Settings (will get shown in Arduino.mk as computed)
+ifndef ALTERNATE_CORE_PATH
+    ifdef CORE_VER
+        ALTERNATE_CORE_PATH = $(ARDUINO_PACKAGE_DIR)/$(ARDMK_VENDOR)/hardware/$(ARCHITECTURE)/$(CORE_VER)
+    else
+        ALTERNATE_CORE_PATH = $(ARDUINO_PACKAGE_DIR)/$(ARDMK_VENDOR)/hardware/$(ARCHITECTURE)
+    endif
+endif
+ifndef ARDUINO_CORE_PATH
+    ARDUINO_CORE_PATH   = $(ALTERNATE_CORE_PATH)/cores/arduino
+endif
+ifndef BOARD_TXT
+    BOARDS_TXT          = $(ALTERNATE_CORE_PATH)/boards.txt
+endif
+
+# Check boards file exists before continuing as parsing non-existant file can create problems
+ifneq ($(findstring boards.txt, $(wildcard $(ALTERNATE_CORE_PATH)/*.txt)), boards.txt)
+    echo $(error $(CORE_VER) Cannot find boards file $(BOARDS_TXT). Check ARDUINO_PACKAGE_DIR path: $(ARDUINO_PACKAGE_DIR) and board support installed)
+endif
+
+# add CMSIS includes
+CPPFLAGS += -I$(CMSIS_DIR)/Include/
+CPPFLAGS += -I$(CMSIS_ATMEL_DIR)/Device/ATMEL
+# path for Cortex library
+LIB_PATH  =  $(CMSIS_DIR)/Lib/GCC
+BOOTLOADER_PARENT = $(ALTERNATE_CORE_PATH)/bootloaders
+
+# Utility from ard-mk to parse boards.txt for flags
+ifndef PARSE_BOARD
+    PARSE_BOARD = $(shell grep -Ev '^\#' $(BOARDS_TXT) | grep -E '^[ \t]*$(1).$(2)=' | cut -d = -f 2 | cut -d : -f 2)
+endif
+
+ifndef VARIANT
+    VARIANT := $(call PARSE_BOARD,$(BOARD_TAG),menu.(chip|cpu).$(BOARD_SUB).build.variant)
+    ifndef VARIANT
+        VARIANT := $(call PARSE_BOARD,$(BOARD_TAG),build.variant)
+    endif
+endif
+
+# grab any sources in the variant core path (variant.cpp defines pin/port mapping on SAM devices)
+ALT_CORE_C_SRCS := $(wildcard $(ALTERNATE_CORE_PATH)/variants/$(VARIANT)/*.c)
+ALT_CORE_CPP_SRCS := $(wildcard $(ALTERNATE_CORE_PATH)/variants/$(VARIANT)/*.cpp)
+ALT_CORE_S_SRCS := $(wildcard $(ALTERNATE_CORE_PATH)/variants/$(VARIANT)/*.S)
+
+# Use arm-toolchain from Arduino install if exists and user has not defined global version
+ifndef ARM_TOOLS_DIR
+    ARM_TOOLS_DIR = $(call dir_if_exists,$(wildcard $(ARDUINO_PACKAGE_DIR)/$(ARDMK_VENDOR)/tools/arm-none-eabi-gcc/*))
+    $(call show_config_variable,ARM_TOOLS_DIR,[COMPUTED],(from ARDUINO_PACKAGE_DIR))
+else
+    $(call show_config_variable,ARM_TOOLS_DIR,[USER])
+endif
+
+# define plaform lib dir from Arduino ARM support
+ifndef ARDUINO_PLATFORM_LIB_PATH
+    ARDUINO_PLATFORM_LIB_PATH := $(ALTERNATE_CORE_PATH)/libraries
+    $(call show_config_variable,ARDUINO_PLATFORM_LIB_PATH,[COMPUTED],(from ARDUINO_PACKAGE_DIR))
+endif
+
+########################################################################
+# command names
+
+ifndef CC_NAME
+    CC_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.gcc)
+    ifndef CC_NAME
+        CC_NAME := arm-none-eabi-gcc
+    else
+        $(call show_config_variable,CC_NAME,[COMPUTED])
+    endif
+endif
+
+ifndef CXX_NAME
+    CXX_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.g++)
+    ifndef CXX_NAME
+        CXX_NAME := arm-none-eabi-g++
+    else
+        $(call show_config_variable,CXX_NAME,[COMPUTED])
+    endif
+endif
+
+ifndef AS_NAME
+    AS_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.as)
+    ifndef AS_NAME
+        AS_NAME := arm-none-eabi-gcc-as
+    else
+        $(call show_config_variable,AS_NAME,[COMPUTED])
+    endif
+endif
+
+ifndef OBJCOPY_NAME
+    OBJCOPY_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.objcopy)
+    ifndef OBJCOPY_NAME
+        OBJCOPY_NAME := arm-none-eabi-objcopy
+    else
+        $(call show_config_variable,OBJCOPY_NAME,[COMPUTED])
+    endif
+endif
+
+ifndef OBJDUMP_NAME
+    OBJDUMP_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.objdump)
+    ifndef OBJDUMP_NAME
+        OBJDUMP_NAME := arm-none-eabi-objdump
+    else
+        $(call show_config_variable,OBJDUMP_NAME,[COMPUTED])
+    endif
+endif
+
+ifndef AR_NAME
+    AR_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.ar)
+    ifndef AR_NAME
+        AR_NAME := arm-none-eabi-ar
+    else
+        $(call show_config_variable,AR_NAME,[COMPUTED])
+    endif
+endif
+
+ifndef SIZE_NAME
+    SIZE_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.size)
+    ifndef SIZE_NAME
+        SIZE_NAME := arm-none-eabi-size
+    else
+        $(call show_config_variable,SIZE_NAME,[COMPUTED])
+    endif
+endif
+
+ifndef NM_NAME
+    NM_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.nm)
+    ifndef NM_NAME
+        NM_NAME := arm-none-eabi-gcc-nm
+    else
+        $(call show_config_variable,NM_NAME,[COMPUTED])
+    endif
+endif
+
+ifndef GDB_NAME
+    GDB_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.gdb)
+    ifndef GDB_NAME
+        GDB_NAME := arm-none-eabi-gdb
+    else
+        $(call show_config_variable,GDB_NAME,[COMPUTED])
+    endif
+endif
+
+ifndef UPLOAD_TOOL
+    UPLOAD_TOOL := $(call PARSE_BOARD,$(BOARD_TAG),upload.tool)
+    ifndef UPLOAD_TOOL
+        UPLOAD_TOOL := openocd
+    else
+        $(call show_config_variable,UPLOAD_TOOL,[COMPUTED])
+    endif
+endif
+
+ifndef BOOTLOADER_UPLOAD_TOOL
+    BOOTLOADER_UPLOAD_TOOL := $(call PARSE_BOARD,$(BOARD_TAG),bootloader.tool)
+    ifndef BOOTLOADER_UPLOAD_TOOL
+        BOOTLOADER_UPLOAD_TOOL := openocd
+    else
+        $(call show_config_variable,BOOTLOADER_UPLOAD_TOOL,[COMPUTED])
+    endif
+endif
+
+# processor stuff
+ifndef MCU
+    MCU := $(call PARSE_BOARD,$(BOARD_TAG),build.mcu)
+endif
+
+ifndef MCU_FLAG_NAME
+    MCU_FLAG_NAME=mcpu
+endif
+
+# native port emulates an AVR chip to use AVRDUDE
+ifndef AVRDUDE_MCU
+    AVRDUDE_MCU := $(call PARSE_BOARD,$(BOARD_TAG),build.emu.mcu)
+endif
+
+# GDP settings
+ifndef GDB_PORT
+    # default to localhost default OpenOCD port
+    GDB_PORT = localhost:3333
+endif
+
+ifndef GDB_OPTS
+    # if using BMP do a scan and attach
+    ifeq ($(findstring /dev/tty, $(strip $(GDB_PORT))), /dev/tty)
+        GDB_OPTS = -ex "target extended-remote $(GDB_PORT)" -ex "monitor swdp_scan" -ex "attach 1" -ex "load" -d $(OBJDIR) $(TARGET_ELF)
+    else
+        GDB_OPTS = -ex "target extended-remote $(GDB_PORT)" -ex "load" -d $(OBJDIR) $(TARGET_ELF)
+    endif
+endif
+
+ifndef GDB_UPLOAD_OPTS
+    GDB_UPLOAD_OPTS = $(GDB_OPTS) -ex "set confirm off" -ex "set target-async off" -ex "set remotetimeout 30" -ex "detach" -ex "kill" -ex "quit"
+endif
+
+########################################################################
+# OpenOCD for SAM devices
+
+ifndef OPENOCD
+    BUNDLED_OPENOCD_DIR := $(call dir_if_exists,$(ARDUINO_PACKAGE_DIR)/$(ARDMK_VENDOR)/tools/openocd)
+    # Try Arduino support package first
+    ifdef BUNDLED_OPENOCD_DIR
+        OPENOCD_VER := $(shell basename $(wildcard $(BUNDLED_OPENOCD_DIR)/*))
+        OPENOCD = $(BUNDLED_OPENOCD_DIR)/$(OPENOCD_VER)/bin/openocd -s $(BUNDLED_OPENOCD_DIR)/$(OPENOCD_VER)/share/openocd/scripts/
+        $(call show_config_variable,OPENOCD,[AUTODETECTED],(from ARDUINO_PACKAGE_DIR))
+    else
+        # Otherwise look on user path
+        OPENOCD := $(shell which openocd 2>/dev/null)
+        ifdef OPENOCD
+            $(call show_config_variable,OPENOCD,[AUTODETECTED],(found in $$PATH))
+        endif
+    endif
+else
+    $(call show_config_variable,OPENOCD,[USER])
+endif
+
+ifndef OPENOCD_OPTS
+    OPENOCD_OPTS += -d2 -f $(ALTERNATE_CORE_PATH)/variants/$(VARIANT)/$(OPENOCD_SCRIPT)
+endif
+
+########################################################################
+# Bossa for SAM devices
+
+ifndef BOSSA
+    BUNDLED_BOSSA_DIR := $(call dir_if_exists,$(ARDUINO_PACKAGE_DIR)/$(ARDMK_VENDOR)/tools/bossac)
+    # Try Arduino support package first
+    ifdef BUNDLED_BOSSA_DIR
+        BOSSA_VER := $(shell basename $(wildcard $(BUNDLED_BOSSA_DIR)/*))
+        BOSSA = $(BUNDLED_BOSSA_DIR)/$(BOSSA_VER)/bossac
+        $(call show_config_variable,BOSSA,[AUTODETECTED],(from ARDUINO_PACKAGE_DIR))
+    else
+        # Otherwise look on user path
+        BOSSA := $(shell which bossac 2>/dev/null)
+        ifdef BOSSA
+            $(call show_config_variable,BOSSA,[AUTODETECTED],(found in $$PATH))
+        endif
+    endif
+else
+    $(call show_config_variable,BOSSA,[USER])
+endif
+
+ifndef BOSSA_OPTS
+    BOSSA_OPTS += -d --info --erase --write --verify --reset
+endif
+
+get_bootloader = $(shell $(RESET_CMD) | tail -1)
+
+# if not bootloader port defined (ISP_PORT), automatically grab first port after reset
+# if not on windows
+ifndef ISP_PORT
+    ifeq ($(CURRENT_OS), WINDOWS)
+        BOSSA_OPTS += --port=$(COM_STYLE_MONITOR_PORT)
+    else
+        BOSSA_OPTS += --port=$(call get_monitor_port)
+    endif
+else
+    BOSSA_OPTS += --port=$(ISP_PORT)
+endif
+
+########################################################################
+# EXECUTABLES
+# Define them here to use ARM_TOOLS_PATH and allow auto finding of AVR_TOOLS_PATH
+OVERRIDE_EXECUTABLES = 1
+
+ARM_TOOLS_PATH := $(ARM_TOOLS_DIR)/bin
+CC      = $(ARM_TOOLS_PATH)/$(CC_NAME)
+CXX     = $(ARM_TOOLS_PATH)/$(CXX_NAME)
+AS      = $(ARM_TOOLS_PATH)/$(AS_NAME)
+OBJCOPY = $(ARM_TOOLS_PATH)/$(OBJCOPY_NAME)
+OBJDUMP = $(ARM_TOOLS_PATH)/$(OBJDUMP_NAME)
+AR      = $(ARM_TOOLS_PATH)/$(AR_NAME)
+SIZE    = $(ARM_TOOLS_PATH)/$(SIZE_NAME)
+NM      = $(ARM_TOOLS_PATH)/$(NM_NAME)
+#GDB     = $(ARM_TOOLS_PATH)/$(GDB_NAME)
+# Use system gdb for now as Arduino supplied has lib error?
+GDB     = $(GDB_NAME)
+
+########################################################################
+# FLAGS
+
+ifndef USB_TYPE
+    USB_TYPE = USBCON
+endif
+
+ifndef USB_PRODUCT
+    USB_PRODUCT := $(call PARSE_BOARD,$(BOARD_TAG),build.usb_product)
+    ifdef USB_PRODUCT
+        $(call show_config_variable,USB_PRODUCT,[COMPUTED])
+    endif
+endif
+
+ifndef USB_MANUFACTURER
+    USB_MANUFACTURER := $(call PARSE_BOARD,$(BOARD_TAG),build.usb_manufacturer)
+    ifndef USB_MANUFACTURER
+        USB_MANUFACTURER = "Unknown"
+    else
+        $(call show_config_variable,USB_MANUFACTURER,[COMPUTED])
+    endif
+endif
+
+ifndef USB_VID
+    USB_VID := $(call PARSE_BOARD,$(BOARD_TAG),build.vid)
+    ifdef USB_VID
+        $(call show_config_variable,USB_VID,[COMPUTED])
+    endif
+endif
+
+ifndef USB_PID
+    USB_PID := $(call PARSE_BOARD,$(BOARD_TAG),build.pid)
+    ifdef USB_PID
+        $(call show_config_variable,USB_PID,[COMPUTED])
+    endif
+endif
+
+# Bootloader settings
+ifndef BOOTLOADER_SIZE
+    BOOTLOADER_SIZE := $(call PARSE_BOARD,$(BOARD_TAG),bootloader.size)
+    ifndef BOOTLOADER_SIZE
+        BOOTLOADER_SIZE := 0x2000
+    else
+        $(call show_config_variable,BOOTLOADER_SIZE,[COMPUTED])
+    endif
+endif
+
+ifndef BOOTLOADER_UNPROTECT
+    BOOTLOADER_UNPROTECT := $(call PARSE_BOARD,$(BOARD_TAG),bootloader.cmd_unprotect)
+    ifndef BOOTLOADER_UNPROTECT
+        BOOTLOADER_UNPROTECT := at91samd bootloader 0
+    else
+        $(call show_config_variable,BOOTLOADER_UNPROTECT,[COMPUTED])
+    endif
+endif
+
+ifndef BOOTLOADER_PROTECT
+    BOOTLOADER_PROTECT := $(call PARSE_BOARD,$(BOARD_TAG),bootloader.cmd_protect)
+    ifndef BOOTLOADER_PROTECT
+        BOOTLOADER_PROTECT := at91samd bootloader 16384
+    else
+        $(call show_config_variable,BOOTLOADER_PROTECT,[COMPUTED])
+    endif
+endif
+
+ifndef BOOTLOADER_PROTECT_VERIFY
+    BOOTLOADER_PROTECT_VERIFY := $(call PARSE_BOARD,$(BOARD_TAG),bootloader.cmd_protect_verify)
+    ifndef BOOTLOADER_PROTECT_VERIFY
+        BOOTLOADER_PROTECT_VERIFY := at91samd bootloader
+    else
+        $(call show_config_variable,BOOTLOADER_PROTECT_VERIFY,[COMPUTED])
+    endif
+endif
+
+# C99 with GNU extensions required for C sources using old compiler
+CC_VERNUM = $(shell $(CC) -dumpversion | sed 's/\.//g')
+ifneq ($(shell expr $(CC_VERNUM) '>' 490), 1)
+    CFLAGS_STD        = -std=gnu99
+endif
+
+CPPFLAGS += -DMD -D$(USB_TYPE) '-DUSB_PRODUCT=$(USB_PRODUCT)' '-DUSB_MANUFACTURER=$(USB_MANUFACTURER)'
+
+# Get extra define flags from boards.txt
+EXFLAGS := $(shell echo $(call PARSE_BOARD,$(BOARD_TAG),build.extra_flags) | grep -oE '(-D)\w+')
+
+# Strip only defines from extra flags as boards file appends user {build.usb}
+CPPFLAGS += $(EXFLAGS)
+CPPFLAGS += -DUSB_VID=$(USB_VID)
+CPPFLAGS += -DUSB_PID=$(USB_PID)
+# Cortex compiler flags
+CPPFLAGS += -mthumb -nostdlib --param max-inline-insns-single=500 -fno-exceptions -Wl,-Map=$(OBJDIR)/$(TARGET).map
+CXXFLAGS += -fno-rtti -fno-threadsafe-statics -std=gnu++11
+
+AMCU := $(call PARSE_BOARD,$(BOARD_TAG),build.mcu)
+BOARD_LINKER_SCRIPT := $(call PARSE_BOARD,$(BOARD_TAG),build.ldscript)
+OPENOCD_SCRIPT := $(call PARSE_BOARD,$(BOARD_TAG),build.openocdscript)
+# TODO Hard defines Cortex M0 math lib - should be dynamic
+LDFLAGS += --specs=nano.specs --specs=nosys.specs -mthumb -Wl,--cref -Wl,--check-sections -Wl,--gc-sections -Wl,--unresolved-symbols=report-all -Wl,--warn-common -Wl,--warn-section-align -Wl,--start-group -L$(LIB_PATH) -larm_cortexM0l_math -lm
+LINKER_SCRIPTS := -T$(ALTERNATE_CORE_PATH)/variants/$(VARIANT)/$(BOARD_LINKER_SCRIPT)
+OTHER_LIBS := $(call PARSE_BOARD,$(BOARD_TAG),build.flags.libs)
+
+# OpenOCD reset command only for now
+ifeq ($(strip $(UPLOAD_TOOL)), openocd)
+    RESET_CMD = $(OPENOCD) $(OPENOCD_OPTS) -c "telnet_port disabled; init; targets; reset run; shutdown"
+else
+    # Set zero flag for ard-reset for 1200 baud boot to bootloader
+    ARD_RESET_OPTS += --zero
+endif
+
+########################################################################
+# automatially include Arduino.mk for the user
+
+$(call show_separator)
+$(call arduino_output,Arduino.mk Configuration:)
+include $(ARDMK_DIR)/Arduino.mk