package/services/optee_app/README

Source codes of optee applications locates in openwrt/marvell/services/optee_app.
Currently, only a few example applications are provided for customers' reference, 
such as random, cipher and so on.
Customers can develop their own TAs and CAs according to ASR examples,
then add their source codes of TA/CA to openwrt/marvell/services/optee_app 
and modify package/services/optee_app/Makefile to build their applications.

For example, if customers want to add an application named 'hello_world'.
Firstly, they need to develop the source codes following below layout:
 marvell/services/optee_app/helloworld/
			├── 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, ...

Secondly, add below two items to package/services/optee_app/Makefile
a):
define Package/optee_app/config
menu "OPTEE application Configuration"
.......
config HELLOWORLD
	bool "Enable hello world TA/CA"
	default n
........
endmenu
endef

b):
ifeq ($(CONFIG_HELLOWORLD),y)
	APP_LIST := $(APP_LIST)" helloworld"
endif

"helloworld" appended to APP_LIST should be the folder name of the hello world application.

Thirdly, 'make menuconfig' under top directory and enable the hello world applcaition as below:
services--->
	optee_app
	OPTEE application Configuration-->
		[*]Enable hello world TA/CA

Lastly, after build openwrt and burn the images to board, the helloworld executable CA is under
usr/sbin and its TA is under /usr/lib/optee_armtz。