plat: arm: Make BL32_BASE platform dependent when SPD_spmd is enabled

To support platforms without Trusted DRAM this patch defines
PLAT_ARM_SPMC_BASE and enables platform to use either Trusted DRAM or
DRAM region behind TZC.

Change-Id: Icaa5c7d33334258ff27e8e0bfd0812c304e68ae4
Signed-off-by: Arunachalam Ganapathy <arunachalam.ganapathy@arm.com>

include/plat/arm/common/arm_def.h

@@ -497,9 +497,9 @@
 # elif defined(SPD_spmd)
 #  define TSP_SEC_MEM_BASE		(ARM_AP_TZC_DRAM1_BASE + ULL(0x200000))
 #  define TSP_SEC_MEM_SIZE		(ARM_AP_TZC_DRAM1_SIZE - ULL(0x200000))
-#  define BL32_BASE			PLAT_ARM_TRUSTED_DRAM_BASE
-#  define BL32_LIMIT			(PLAT_ARM_TRUSTED_DRAM_BASE	\
-						+ (UL(1) << 21))
+#  define BL32_BASE			PLAT_ARM_SPMC_BASE
+#  define BL32_LIMIT			(PLAT_ARM_SPMC_BASE +		\
+						 PLAT_ARM_SPMC_SIZE)
 # elif ARM_BL31_IN_DRAM
 #  define TSP_SEC_MEM_BASE		(ARM_AP_TZC_DRAM1_BASE +	\
 						PLAT_ARM_MAX_BL31_SIZE)

plat/arm/board/fvp/include/platform_def.h

@@ -43,6 +43,15 @@
 #define PLAT_ARM_TRUSTED_DRAM_BASE	UL(0x06000000)
 #define PLAT_ARM_TRUSTED_DRAM_SIZE	UL(0x02000000)	/* 32 MB */
 
+/*
+ * Max size of SPMC is 2MB for fvp. With SPMD enabled this value corresponds to
+ * max size of BL32 image.
+ */
+#if defined(SPD_spmd)
+#define PLAT_ARM_SPMC_BASE		PLAT_ARM_TRUSTED_DRAM_BASE
+#define PLAT_ARM_SPMC_SIZE		UL(0x200000)  /* 2 MB */
+#endif
+
 /* virtual address used by dynamic mem_protect for chunk_base */
 #define PLAT_ARM_MEM_PROTEC_VA_FRAME	UL(0xc0000000)