mbtk/optee_test/Guide.txt

How to write a Trusted/Host Application?
	1.	Please refer to
		https://optee.readthedocs.io/en/latest/building/trusted_applications.html#build-trusted-applications
		https://optee.readthedocs.io/en/latest/building/gits/optee_examples/optee_examples.html#optee-examples
	2.	We perpare a minimal set of optee_examples which only contains hello world for your reference.
		Unzip optee_appref and there is a hello_world example with below layout:
		hello_world/
			├── host
			│	├── Makefile                  BINARY=optee_example_hello_world
			│	└── main.c                    Implementation of host application of hello world		
			└── ta
				├── Makefile                  BINARY=<uuid>
				├── sub.mk                    srcs-y += hello_world_ta.c
				├── include
				│   └── hello_world_ta.h      Header exported to non-secure: TA commands API
				├── hello_world_ta.c          Implementation of TA entry points
				└── user_ta_header_defines.h  TA_UUID, TA_FLAGS, TA_DATA/STACK_SIZE, ...
		
	3.	Please update conf.mk according to your environment
		ASR_OWRT_DIR should be the top directory of ASR1803 openwrt release.
		HOST_CROSS_COMPILE should be tool-chain used by ASR openwrt release.
		please run below command first with ASR_OWRT_DIR replaced with the openwrt path or
		add it to ~/.bashrc and source ~/.bashrc:
			export PATH=$ASR_OWRT_DIR/owtoolchain/linux64/bin:$PATH
		TA_CROSS_COMPILE should be the tool-chain that ASR uses to compile optee_os.
	4.	Please add your own TAs and Host application like the hello_world example and make under the top directory.
		Then the built TA is under out/ta and host application is under out/ca
	
How to install tool-chain of optee_os, please refer to
	https://optee.readthedocs.io/en/latest/building/toolchains.html
and confirm the tool-chain version with ASR.
e.g.:
	1.	Download gcc-arm-10.3-2021.07-x86_64-arm-none-linux-gnueabihf.tar.xz from:
		https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-a/downloads
	2.	tar xf gcc-arm-10.3-2021.07-x86_64-arm-none-linux-gnueabihf.tar.xz -C aarch32 --strip-components=1
	3.	export PATH=$PATH:$TOOLCHAIN/aarch32/bin