To get practical hands-on and more details about OP-TEE Early TA (Trusted Application) go through below YouTube Video:
How to communicate with OP-TEE Early TA at U-Boot level.
Add a command in U-Boot level to communicate with OP-TEE Early TA
Run OP-TEE and x-test on QEMU v8
Build and Run OP-TEE OS on QEMU
Blogspot: https://bit.ly/3Kh2dRT
Get more information on Quora Link below:
https://howtorunopteeonqemuarmv8v7.quora.com/?invite_code=ym8C6ev4mVZUnJMl2s3J