AArch32: Add ARM platform changes in BL1

This patch adds ARM platform changes in BL1 for AArch32 state.
It also enables building of BL1 for ARCH=aarch32.

Change-Id: I079be81a93d027f37b0f7d8bb474b1252bb4cf48

Makefile

@@ -517,13 +517,13 @@ endif
 ################################################################################
 # Include BL specific makefiles
 ################################################################################
-# BL31 is not needed and BL1, BL2 & BL2U are not currently supported in AArch32
-ifneq (${ARCH},aarch32)
 ifdef BL1_SOURCES
 NEED_BL1 := yes
 include bl1/bl1.mk
 endif
 
+# For AArch32, BL31 is not applicable, and BL2 & BL2U are not supported at present.
+ifneq (${ARCH},aarch32)
 ifdef BL2_SOURCES
 NEED_BL2 := yes
 include bl2/bl2.mk

plat/arm/board/fvp/platform.mk

@@ -113,8 +113,8 @@ endif
 
 BL1_SOURCES		+=	drivers/io/io_semihosting.c			\
 				lib/semihosting/semihosting.c			\
-				lib/semihosting/aarch64/semihosting_call.S	\
-				plat/arm/board/fvp/aarch64/fvp_helpers.S	\
+				lib/semihosting/${ARCH}/semihosting_call.S	\
+				plat/arm/board/fvp/${ARCH}/fvp_helpers.S	\
 				plat/arm/board/fvp/fvp_bl1_setup.c		\
 				plat/arm/board/fvp/fvp_err.c			\
 				plat/arm/board/fvp/fvp_io_storage.c		\

plat/arm/common/arm_bl1_setup.c

@@ -132,7 +132,11 @@ void arm_bl1_plat_arch_setup(void)
 			      BL1_COHERENT_RAM_LIMIT
 #endif
 			     );
+#ifdef AARCH32
+	enable_mmu_secure(0);
+#else
 	enable_mmu_el3(0);
+#endif /* AARCH32 */
 }
 
 void bl1_plat_arch_setup(void)

plat/arm/common/arm_common.mk

@@ -116,7 +116,7 @@ BL1_SOURCES		+=	drivers/arm/sp805/sp805.c			\
 				drivers/io/io_storage.c				\
 				plat/arm/common/arm_bl1_setup.c			\
 				plat/arm/common/arm_io_storage.c		\
-				plat/common/aarch64/platform_up_stack.S
+				plat/common/${ARCH}/platform_up_stack.S
 ifdef EL3_PAYLOAD_BASE
 # Need the arm_program_trusted_mailbox() function to release secondary CPUs from
 # their holding pen