plat/arm/sgi: Add board support for SGI-Clark.Helios platform

SGI-Clark.Helios platform is similar to SGI-Clark.Ares platform.
The difference between these two platforms is the CPU type and
the number of CPUs. Add the base support for SGI-Clark.Helios platform.

Change-Id: I2b04cb3fb953907848b4fab016e3648899ca4256
Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>
diff --git a/plat/arm/board/sgiclarkh/platform.mk b/plat/arm/board/sgiclarkh/platform.mk
new file mode 100644
index 0000000..222ca60
--- /dev/null
+++ b/plat/arm/board/sgiclarkh/platform.mk
@@ -0,0 +1,42 @@
+#
+# Copyright (c) 2018, Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+include plat/arm/css/sgi/sgi-common.mk
+
+SGICLARKH_BASE		=	plat/arm/board/sgiclarkh
+
+PLAT_INCLUDES		+=	-I${SGICLARKH_BASE}/include/
+
+SGI_CPU_SOURCES		:=	lib/cpus/aarch64/cortex_helios.S
+
+BL1_SOURCES		+=	${SGI_CPU_SOURCES}
+
+BL2_SOURCES		+=	${SGICLARKH_BASE}/sgiclarkh_plat.c	\
+				${SGICLARKH_BASE}/sgiclarkh_security.c	\
+				drivers/arm/tzc/tzc_dmc620.c		\
+				lib/utils/mem_region.c			\
+				plat/arm/common/arm_nor_psci_mem_protect.c
+
+BL31_SOURCES		+=	${SGI_CPU_SOURCES}			\
+				${SGICLARKH_BASE}/sgiclarkh_plat.c	\
+				drivers/cfi/v2m/v2m_flash.c		\
+				lib/utils/mem_region.c			\
+				plat/arm/common/arm_nor_psci_mem_protect.c
+
+# Add the FDT_SOURCES and options for Dynamic Config
+FDT_SOURCES		+=	${SGICLARKH_BASE}/fdts/${PLAT}_tb_fw_config.dts
+TB_FW_CONFIG		:=	${BUILD_PLAT}/fdts/${PLAT}_tb_fw_config.dtb
+
+# Add the TB_FW_CONFIG to FIP and specify the same to certtool
+$(eval $(call TOOL_ADD_PAYLOAD,${TB_FW_CONFIG},--tb-fw-config))
+
+FDT_SOURCES		+=	${SGICLARKH_BASE}/fdts/${PLAT}_nt_fw_config.dts
+NT_FW_CONFIG		:=	${BUILD_PLAT}/fdts/${PLAT}_nt_fw_config.dtb
+
+# Add the NT_FW_CONFIG to FIP and specify the same to certtool
+$(eval $(call TOOL_ADD_PAYLOAD,${NT_FW_CONFIG},--nt-fw-config))
+
+override CTX_INCLUDE_AARCH32_REGS	:= 0