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This patch adds support for TBB to rpi3. The ROTPK is generated at build
time and is included into BL1/BL2. The key and content certificates are
read over semihosting.
Tested-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>

Support for loading optee images as BL32 secure payload.
Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>

This port can be compiled to boot an AArch64 or AArch32 payload with the
build option `RPI3_BL33_AARCH32`.

Note: This is not a secure port of the Trusted Firmware. This port is
only meant to be a reference implementation to experiment with an
inexpensive board in real hardware.

Change-Id: Ide58114299289bf765ef1366199eb05c46f81903
Co-authored-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>