targets/zephyr: Rename from arduino_101, with more targets supported.

- Add preliminary support for ARC architecture.

Using "em_starterkit" board supported by Zephyr. Only build for this board
is tested, not booted on a real device due to lack of access. There's no
QEMU emulation support for ARC in Zephyr (yet) either.

- Update README to cover different Zephyr architectures/boards.

- Changed the arduino_101 paths to something more generic and adaptable
- Made sure it compiles and runs on Arduino 101

JerryScript-DCO-1.0-Signed-off-by: Sergio Martinez sergio.martinez.rodriguez@intel.com
JerryScript-DCO-1.0-Signed-off-by: Paul Sokolovsky paul.sokolovsky@linaro.org

Author: pfalcon

targets/arduino_101/Makefile renamed to targets/zephyr/Makefile

@@ -18,10 +18,10 @@
 ifndef ZEPHYR_BASE
 $(error Missing zephyr base)
 endif
- 
+
 # For testing without real hardware use qemu_x86 instead of arduino_101
 BOARD ?= arduino_101
- 
+
 O ?= $(PROJECT_BASE)/outdir
 
 ZEPHYR    ?= $(ZEPHYR_BASE)
@@ -31,7 +31,8 @@ JERRYHEAP ?= 16
 ZEPHYRINC   = $(ZEPHYR_BASE)/include
 ZEPHYRLIB   = $(ZEPHYR_BASE)/lib
 
-SOURCE_DIR = ./targets/arduino_101/src
+TARGET_ZEPHYR ?= ./targets/zephyr
+SOURCE_DIR = $(TARGET_ZEPHYR)/src
 
 export JERRY_INCLUDE = $(CURDIR)/jerry-core/
 

targets/arduino_101/Makefile.arduino_101 renamed to targets/zephyr/Makefile.zephyr

@@ -29,6 +29,9 @@ ifeq ($(BOARD),qemu_x86)
 BOARD_NAME ?= qemu_x86
 endif
 
+TARGET_ZEPHYR ?= ./targets/zephyr
+SOURCE_DIR = $(TARGET_ZEPHYR)/src
+
 TYPE  ?= release
 JERRYHEAP ?= 16
 
@@ -68,6 +71,11 @@ else ifeq ($(BOARD),qemu_cortex_m3)
 CONFIG_TOOLCHAIN_VARIANT = arm
 CPU = arm7-m
 EXT_CFLAGS += -march=armv7-m -mthumb -mcpu=cortex-m3 -mabi=aapcs
+else ifeq ($(BOARD),em_starterkit)
+# TODO: Tested only to build, untested to boot
+CONFIG_TOOLCHAIN_VARIANT = arc
+CPU = arc
+EXT_CFLAGS += -mARCv2EM -mav2em -mno-sdata
 else
 CONFIG_TOOLCHAIN_VARIANT = iamcu
 CPU = lakemont
@@ -97,10 +105,7 @@ ZEPHYR_BIN = $(OUTPUT)/zephyr/zephyr.strip
 PREFIX = $(TYPE)$(VARIETY)
 LIBS = $(TYPE).external$(VARIETY)-entry $(PREFIX).jerry-core $(PREFIX).jerry-libm.lib
 
-# TODO @sergioamr Change how we link the library to USER_LDFLAGS
-# https://gerrit.zephyrproject.org/r/#/c/2048/
-
-BUILD_CONFIG = O="$(OUTPUT)/zephyr" V=$(V) USER_LIBS="$(LIBS)" USER_LIB_INCLUDE_DIR="-L $(CURDIR)/$(OUTPUT)"
+BUILD_CONFIG = O="$(OUTPUT)/zephyr" V=$(V) USER_LIBS="$(LIBS)" USER_LIB_INCLUDE_DIR="-L $(CURDIR)/$(OUTPUT)" TARGET_ZEPHYR=$(TARGET_ZEPHYR)
 
 .PHONY: all
 all: jerry zephyr
@@ -124,7 +129,7 @@ endif
 	 -DEXTERNAL_CMAKE_SYSTEM_PROCESSOR=lakemont \
 	 -DEXTERNAL_LIBC_INTERFACE="$(ZEPHYR_LIBC_INC)" \
 	 -DCMAKE_TOOLCHAIN_FILE=build/configs/toolchain_external.cmake \
-	 -DEXTERNAL_BUILD_ENTRY_FILE=./targets/arduino_101/src/jerry-entry.c
+	 -DEXTERNAL_BUILD_ENTRY_FILE=$(SOURCE_DIR)/jerry-entry.c
 
 	make -C $(INTERM) $(TYPE).external$(VARIETY) V=1
 	cp `cat $(INTERM)/$(TYPE).external$(VARIETY)/list` $(OUTPUT)/.
@@ -134,7 +139,7 @@ $(ZEPHYR_BIN):
 ifdef V
 	@echo "- ZEPHYR -------------------------------------------------------"
 endif
-	make -f ./targets/arduino_101/Makefile $(BUILD_CONFIG)
+	make -f $(TARGET_ZEPHYR)/Makefile $(BUILD_CONFIG)
 	@echo "Finished"
 	@file $(OUTPUT)/zephyr/zephyr.strip
 	@size $(OUTPUT)/zephyr/zephyr.strip	
@@ -146,10 +151,10 @@ zephyr:	$(EXTERNAL_LIB) $(ZEPHYR_BIN)
 	@touch $(ZEPHYR_BIN)
 
 qemu:	$(EXTERNAL_LIB) $(ZEPHYR_BIN)
-	make -f ./targets/arduino_101/Makefile $(BUILD_CONFIG) qemu
+	make -f $(TARGET_ZEPHYR)/Makefile $(BUILD_CONFIG) qemu
 
 flash:	$(EXTERNAL_LIB) $(OUTPUT)/zephyr/zephyr.strip
-	make -f ./targets/arduino_101/Makefile $(BUILD_CONFIG) flash
+	make -f $(TARGET_ZEPHYR)/Makefile $(BUILD_CONFIG) flash
 
 usage:
 help:
@@ -171,19 +176,20 @@ showconfig:
 	@echo "LIBS             = $(LIBS) "	
 	@echo "LIB_INCLUDE_DIR  = $(LIB_INCLUDE_DIR) "
 	@echo "BUILD_CONFIG     = $(BUILD_CONFIG) "
-	make -f ./targets/arduino_101/Makefile $(BUILD_CONFIG) showconfig
+	make -f $(TARGET_ZEPHYR)/Makefile $(BUILD_CONFIG) showconfig
 
 # TODO @sergioamr Temporal cleanup before finding why Zephyr is ignoring my 
 # 		  outdir for the project
 clean:
 	@echo "Clearing Jerryscript"
 	@rm -rf $(OUTPUT)
 	@rm -rf $(INTERM)
-	@rm -f ./targets/arduino_101/src/.*.o.cmd
-	@rm -f ./targets/arduino_101/src/*.o
+	@rm -f $(SOURCE_DIR)/.*.o.cmd
+	@rm -f $(SOURCE_DIR)/*.o
 	@echo "Clearing Zephyr"
-	make -f ./targets/arduino_101/Makefile clean
-	make -f ./targets/arduino_101/Makefile pristine
+	make -f $(TARGET_ZEPHYR)/Makefile clean
+	make -f $(TARGET_ZEPHYR)/Makefile pristine
 
 mrproper:
-	make -f ./targets/arduino_101/Makefile mrproper
+	make -f $(TARGET_ZEPHYR)/Makefile mrproper
+

targets/arduino_101/README.md renamed to targets/zephyr/README.md

@@ -1,43 +1,43 @@
 ### About
 
-This folder contains files to run JerryScript on Zephyr with
-[Arduino 101 / Genuino 101](https://www.arduino.cc/en/Main/ArduinoBoard101)
-
-Zephyr project arduino 101
-[Zephyr Arduino 101](https://www.zephyrproject.org/doc/board/arduino_101.html)
+This folder contains files to integrate JerryScript with Zephyr RTOS to
+run on a number of supported boards (like
+[Arduino 101 / Genuino 101](https://www.arduino.cc/en/Main/ArduinoBoard101),
+[Zephyr Arduino 101](https://www.zephyrproject.org/doc/board/arduino_101.html)).
 
 ### How to build
 
 #### 1. Preface
 
-1, Directory structure
+1. Directory structure
 
 Assume `harmony` as the path to the projects to build.
 The folder tree related would look like this.
 
 ```
 harmony
-  + jerry
+  + jerryscript
   |  + targets
-  |      + arduino_101
+  |      + zephyr
   + zephyr
 ```
 
 
-2, Target board
+2. Target boards/emulations
 
-Assume [Arduino 101 / Genuino 101](https://www.arduino.cc/en/Main/ArduinoBoard101)
-as the target board.
+Following Zephyr boards were tested: qemu_x86, qemu_cortex_m3, arduino_101.
 
 
 #### 2. Prepare Zephyr
 
 Follow [this](https://www.zephyrproject.org/doc/getting_started/getting_started.html) page to get
 the Zephyr source and configure the environment.
 
-Follow "Building a Sample Application" and check that you can flash the Arduino 101
+If you just start with Zephyr, you may want to follow "Building a Sample
+Application" section in the doc above and check that you can flash your
+target board.
 
-Remember to source the zephyr environment.
+Remember to source the Zephyr environment:
 
 ```
 source zephyr-env.sh
@@ -49,10 +49,26 @@ export ZEPHYR_SDK_INSTALL_DIR=<sdk installation directory>
 
 #### 3. Build JerryScript for Zephyr
 
+The easiest way is to build and run on a QEMU emulator:
+
+For x86 architecture:
+
+```
+make -f ./targets/zephyr/Makefile.zephyr BOARD=qemu_x86 qemu
+```
+
+For ARM (Cortex-M) architecture:
+
+```
+make -f ./targets/zephyr/Makefile.zephyr BOARD=qemu_cortex_m3 qemu
+```
+
+#### 4. Build for Arduino 101
+
 ```
 # assume you are in harmony folder
 cd jerry
-make -f ./targets/arduino_101/Makefile.arduino_101
+make -f ./targets/zephyr/Makefile.zephyr BOARD=arduino_101
 ```
 
 This will generate the following libraries:
@@ -71,20 +87,21 @@ The final Zephyr image will be located here:
 
 Details on how to flash the image can be found here:
 [Flashing image](https://www.zephyrproject.org/doc/board/arduino_101.html)
+(or similar page for other supported boards).
 
 To be able to use this demo in hardware you will need the serial console
 which will be generating output to Pins 0 & 1
 
 Some examples of building the software
 
 ```
-make -f ./targets/arduino_101/Makefile.arduino_101 clean
+make -f ./targets/zephyr/Makefile.zephyr clean
 ```
 
 - Not using a Jtag and having a factory stock Arduino 101.
 
 ```
-make -f ./targets/arduino_101/Makefile.arduino_101 BOARD=arduino_101_factory 
+make -f ./targets/zephyr/Makefile.zephyr BOARD=arduino_101_factory
 ```
 
 Follow the Zephyr instructions to flash using the dfu-util command.
@@ -96,16 +113,10 @@ There is a helper function to flash using the JTAG and Flywatter2
 
 ![alt tag](docs/arduino_101.jpg?raw=true "Example")
 ```
-make -f ./targets/arduino_101/Makefile.arduino_101 BOARD=arduino_101 flash
+make -f ./targets/zephyr/Makefile.zephyr BOARD=arduino_101 flash
 
 ```
 
-- Compiling and running with the emulator
-```
-make -f ./targets/arduino_101/Makefile.arduino_101 BOARD=qemu_x86 qemu
-```
-
-
 #### 6. Serial terminal
 
 Test command line in a serial terminal.
@@ -137,4 +148,4 @@ Help will provide a list of commands
 > help
 ```
 
-This program, is built in top of the Zephyr command line, so there is a limit of 10 spaces.
+This program, is built in top of the Zephyr command line, so there is a limit of 10 spaces.