Nonos boot form OPENAMP and open VirtualIO in default.

1.How to boot nonos:
	make all

  When you entry linux console, enter commands:
  (Follow command has been added in linux/rootfs/initramfs/disk_base/etc/init.d/rcS at present)

	echo rom > /sys/class/remoteproc/remoteproc0/firmware 
	echo start > /sys/class/remoteproc/remoteproc0/state 

2.If you want to debug nonos by boot from xboot.
  1)Set DEBUG_NONOS = 1 in Makefile (line. 10).

  2)Use the HW UART(default UART2) in variant.h
	#define SERIAL_UART_INSTANCE    2

  3)put binary in romter, spi_all.bin in nonos/Bchip-non-os/bin


3.if you want to use a device(defalut none of the device is in use)
  1) set in variants/sp7021_evb/variant.h

  .. code-block:: c
	/* select spi.(SPI0-SPI4) */
	//#define SPI_SEL_INSTANCE      1
	/* select i2c.(I2C0-I2C3) */
	//#define I2C_SEL_INSTANCE      1

  NOTE:if run linux and nonos at same time. please notice the conflict device.
	Here offer the script check conflict device.
	when you 'make nonos' in project root. Print info as follow:

		xt.hu@cdoa16 ~/new_code> make nonos
		make[1]: Entering directory '/home/xt.hu/new_code/nonos/Bchip-non-os'
		[nonos check]info: no conflict dev. is OK!
		make[1]: Leaving directory '/home/xt.hu/new_code/nonos/Bchip-non-os'

	if confilct dev exist:

		xt.hu@cdoa16 ~/new_code [SIGINT]> make nonos
		make[1]: Entering directory '/home/xt.hu/new_code/nonos/Bchip-non-os'
		--------------------------------------------------------------
		[nonos check] WARNING: Devices that conflicts with Linux:
		spi_controller1
		Devices can't normally work.Please select other similar device
		--------------------------------------------------------------
		Makefile:141: recipe for target 'check' failed
		make[1]: *** [check] Error 1
		make[1]: Leaving directory '/home/xt.hu/new_code/nonos/Bchip-non-os'
		build/Makefile:259: recipe for target 'nonos' failed
		make: *** [nonos] Error 2

  2) complie the example in Makefile

     nonos/Bchip-non-os/Makefile(line. 110)
	# Arduino C++ Example
	DIRS += $(TOPDIR)/libraries/examples
	#DIRS += $(TOPDIR)/libraries/examples/timer
	#DIRS += $(TOPDIR)/libraries/examples/i2c
	#DIRS += $(TOPDIR)/libraries/examples/exti
	#DIRS += $(TOPDIR)/libraries/examples/VirtIOSerial
	#DIRS += $(TOPDIR)/libraries/examples/uart

     refer to:
	libraries/examples

	notice:Only one example can be compiled at a time.
	In fact the example just implements the function setup() and loop().

	framework in nonos/Bchip-non-os/cores/arduino/main.cpp:

	.. code-block:: c
		int main(void)
		{
			initVariant();

			setup();

			for (;;) {
			#if defined(CORE_CALLBACK)
				CoreCallback();
			#endif
				loop();
				serialEventRun();
			}
			return 0;
		}