optee: Add CONFIG_OPTEE_TZDRAM_BASE

OPTEE is currently linked to a specific area of memory called the TrustZone
DRAM. This patch adds a CONFIG entry for the default address of TrustZone
DRAM that a board-port can over-ride. The region that U-Boot sets aside for
the OPTEE run-time should be verified before attempting to hand off to the
OPTEE run-time. Each board-port should carefully ensure that the TZDRAM
address specified in the OPTEE build and the TZDRAM address specified in
U-Boot match-up.

Further patches will use TZDRAM address with other defines and variables to
carry out a degree of automated verification in U-Boot prior to trying to
boot an OPTEE image.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Cc: Harinarayan Bhatta <harinarayan@ti.com>
Cc: Andrew F. Davis <afd@ti.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Kever Yang <kever.yang@rock-chips.com>
Cc: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

lib/optee/Kconfig

@@ -14,3 +14,11 @@ config OPTEE_TZDRAM_SIZE
 	help
 	  The size of pre-allocated Trust Zone DRAM to allocate for the OPTEE
 	  runtime.
+
+config OPTEE_TZDRAM_BASE
+	hex "Base address of Trust-Zone RAM for the OPTEE image"
+	depends on OPTEE
+	default 0x9d000000
+	help
+	  The base address of pre-allocated Trust Zone DRAM for
+	  the OPTEE runtime.