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Add build steps for building U-Boot in secure state with TF-A and OP-TEE. It includes the full steps for building OP-TEE and TF-A to use with U-Boot. Also a short description how to invoke QEMU with enabled EL3 and EL2. EL3 (machine option secure=on) is required to run TF-A. Signed-off-by: Johannes Krottmayer <krotti83@proton.me> Acked-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Cc: Tom Rini <trini@konsulko.com> Cc: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>