[U-Boot] [PATCH 2/9] optee: Add CONFIG_OPTEE_TZDRAM_SIZE

[Bryan O'Donoghue]

OPTEE is currently linked to a specific area of memory called the TrustZone
DRAM. This patch adds a CONFIG entry for the default size 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
size specified in the OPTEE build and the TZDRAM size specified in U-Boot
match-up.

Further patches will use TZDRAM size and 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 at linaro.org>
Cc: Harinarayan Bhatta <harinarayan at ti.com>
Cc: Andrew F. Davis <afd at ti.com>
Cc: Tom Rini <trini at konsulko.com>
Cc: Kever Yang <kever.yang at rock-chips.com>
Cc: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
Cc: Peng Fan <peng.fan at nxp.com>
---
 lib/optee/Kconfig | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/optee/Kconfig b/lib/optee/Kconfig
index 2e406fe..41c0ab7 100644
--- a/lib/optee/Kconfig
+++ b/lib/optee/Kconfig
@@ -6,3 +6,11 @@ config OPTEE
           enable an OPTEE specific bootm command that will perform additional
           OPTEE specific checks before booting an OPTEE image created with
           mkimage.
+
+config OPTEE_TZDRAM_SIZE
+	hex "Amount of Trust-Zone RAM for the OPTEE image"
+	depends on OPTEE
+	default 0x3000000
+	help
+	  The size of pre-allocated Trust Zone DRAM to allocate for the OPTEE
+	  runtime.
-- 
2.7.4