stm32mp1: Link BL2, BL32 and DTB in one binary

platform.mk is updated to have compilation rules for DTB, stm32image tool,
and the concatenation of the 3 binaries.
A new linker script and an assembly file are added to manage this.
Signed-off-by: Yann Gautier <yann.gautier@st.com>
Signed-off-by: Mathieu Belou <mathieu.belou@st.com>
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>

plat/st/stm32mp1/platform.mk

@@ -20,6 +20,11 @@ PLAT_INCLUDES		:=	-Iplat/st/stm32mp1/include/
 PLAT_INCLUDES		+=	-Iinclude/common/tbbr
 PLAT_INCLUDES		+=	-Iinclude/drivers/st
 
+# Device tree
+STM32_DTB_FILE_NAME	?=	stm32mp157c-ev1.dtb
+FDT_SOURCES		:=	$(addprefix fdts/, $(patsubst %.dtb,%.dts,$(STM32_DTB_FILE_NAME)))
+DTC_FLAGS		+=	-Wno-unit_address_vs_reg
+
 include lib/libfdt/libfdt.mk
 
 PLAT_BL_COMMON_SOURCES	:=	plat/st/stm32mp1/stm32mp1_common.c
@@ -68,3 +73,76 @@ BL2_SOURCES		+=	common/desc_image_load.c				\
 # For memory footprint optimization, build with thumb and interwork support
 ASFLAGS			+=	-mthumb -mthumb-interwork
 TF_CFLAGS		+=	-mthumb -mthumb-interwork
+
+# Macros and rules to build TF binary
+STM32_TF_ELF_LDFLAGS	:=	--hash-style=gnu --as-needed
+STM32_DT_BASENAME	:=	$(STM32_DTB_FILE_NAME:.dtb=)
+STM32_TF_STM32		:=	${BUILD_PLAT}/tf-a-${STM32_DT_BASENAME}.stm32
+STM32_TF_BINARY		:=	$(STM32_TF_STM32:.stm32=.bin)
+STM32_TF_MAPFILE	:=	$(STM32_TF_STM32:.stm32=.map)
+STM32_TF_LINKERFILE	:=	$(STM32_TF_STM32:.stm32=.ld)
+STM32_TF_ELF		:=	$(STM32_TF_STM32:.stm32=.elf)
+STM32_TF_DTBFILE	:=      ${BUILD_PLAT}/fdts/${STM32_DTB_FILE_NAME}
+STM32_TF_OBJS		:=	${BUILD_PLAT}/stm32mp1.o
+
+# Variables for use with stm32image
+STM32IMAGEPATH		?= tools/stm32image
+STM32IMAGE		?= ${STM32IMAGEPATH}/stm32image${BIN_EXT}
+
+.PHONY:			${STM32_TF_STM32}
+.SUFFIXES:
+
+all: check_dtc_version ${STM32_TF_STM32} stm32image
+
+ifeq ($(AARCH32_SP),sp_min)
+# BL32 is built only if using SP_MIN
+BL32_DEP		:= bl32
+BL32_PATH		:= -DBL32_BIN_PATH=\"${BUILD_PLAT}/bl32.bin\"
+endif
+
+distclean realclean clean: clean_stm32image
+
+stm32image:
+	${Q}${MAKE} CPPFLAGS="" --no-print-directory -C ${STM32IMAGEPATH}
+
+clean_stm32image:
+	${Q}${MAKE} --no-print-directory -C ${STM32IMAGEPATH} clean
+
+check_dtc_version:
+	$(eval DTC_V = $(shell $(DTC) -v | awk '{print $$NF}'))
+	$(eval DTC_VERSION = $(shell printf "%d" $(shell echo ${DTC_V} | cut -d- -f1 | sed "s/\./0/g")))
+	@if [ ${DTC_VERSION} -lt 10404 ]; then \
+		echo "dtc version too old (${DTC_V}), you need at least version 1.4.4"; \
+		false; \
+	fi
+
+
+${STM32_TF_OBJS}:	plat/st/stm32mp1/stm32mp1.S bl2 ${BL32_DEP} ${STM32_TF_DTBFILE}
+			@echo "  AS      $<"
+			${Q}${AS} ${ASFLAGS} ${TF_CFLAGS} \
+				${BL32_PATH} \
+				-DBL2_BIN_PATH=\"${BUILD_PLAT}/bl2.bin\" \
+				-DDTB_BIN_PATH=\"${STM32_TF_DTBFILE}\" \
+				-c plat/st/stm32mp1/stm32mp1.S -o $@
+
+${STM32_TF_LINKERFILE}:	plat/st/stm32mp1/stm32mp1.ld.S
+			@echo "  LDS     $<"
+			${Q}${AS} ${ASFLAGS} ${TF_CFLAGS} -P -E $< -o $@
+
+${STM32_TF_ELF}:	${STM32_TF_OBJS} ${STM32_TF_LINKERFILE}
+			@echo "  LDS     $<"
+			${Q}${LD} -o $@ ${STM32_TF_ELF_LDFLAGS} -Map=${STM32_TF_MAPFILE} --script ${STM32_TF_LINKERFILE} ${STM32_TF_OBJS}
+
+${STM32_TF_BINARY}:	${STM32_TF_ELF}
+			${Q}${OC} -O binary ${STM32_TF_ELF} $@
+			@echo
+			@echo "Built $@ successfully"
+			@echo
+
+${STM32_TF_STM32}:	stm32image ${STM32_TF_BINARY}
+			@echo
+			@echo "Generated $@"
+			$(eval LOADADDR =  $(shell cat ${STM32_TF_MAPFILE} | grep RAM | awk '{print $$2}'))
+			$(eval ENTRY =  $(shell cat ${STM32_TF_MAPFILE} | grep "__BL2_IMAGE_START" | awk '{print $$1}'))
+			${STM32IMAGE} -s ${STM32_TF_BINARY} -d $@ -l $(LOADADDR) -e ${ENTRY} -v ${STM32_TF_VERSION}
+			@echo

plat/st/stm32mp1/stm32mp1.S

+/*
+ * Copyright (c) 2016-2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifdef BL32_BIN_PATH
+.section .bl32_image
+.incbin BL32_BIN_PATH
+#endif
+
+.section .bl2_image
+.incbin BL2_BIN_PATH
+
+.section .dtb_image
+.incbin DTB_BIN_PATH

plat/st/stm32mp1/stm32mp1.ld.S

+/*
+ * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __STM32MP1_LD_S__
+#define __STM32MP1_LD_S__
+#include <platform_def.h>
+#include <xlat_tables_defs.h>
+
+OUTPUT_FORMAT(PLATFORM_LINKER_FORMAT)
+OUTPUT_ARCH(PLATFORM_LINKER_ARCH)
+
+ENTRY(__BL2_IMAGE_START__)
+
+MEMORY {
+	HEADER (rw) : ORIGIN = 0x00000000, LENGTH = 0x3000
+	RAM (rwx) : ORIGIN = STM32MP1_BINARY_BASE, LENGTH = STM32MP1_BINARY_SIZE
+}
+
+SECTIONS
+{
+    /*
+     * TF mapping must conform to ROM code specification.
+     */
+    .header : {
+        __HEADER_START__ = .;
+        KEEP(*(.header))
+        . = ALIGN(4);
+        __HEADER_END__ = .;
+    } >HEADER
+
+    . = STM32MP1_BINARY_BASE;
+    .data . : {
+        . = ALIGN(PAGE_SIZE);
+        __DATA_START__ = .;
+        *(.data*)
+
+        /*
+         * dtb.
+         * The strongest and only alignment contraint is MMU 4K page.
+         * Indeed as images below will be removed, 4K pages will be re-used.
+         */
+        . = ( STM32MP1_DTB_BASE - STM32MP1_BINARY_BASE );
+        __DTB_IMAGE_START__ = .;
+        *(.dtb_image*)
+        __DTB_IMAGE_END__ = .;
+
+        /*
+         * bl2.
+         * The strongest and only alignment contraint is MMU 4K page.
+         * Indeed as images below will be removed, 4K pages will be re-used.
+         */
+        . = ( STM32MP1_BL2_BASE - STM32MP1_BINARY_BASE );
+        __BL2_IMAGE_START__ = .;
+        *(.bl2_image*)
+        __BL2_IMAGE_END__ = .;
+
+        /*
+         * bl32 will be settled by bl2.
+         * The strongest and only alignment constraint is 8 words to simplify
+         * memraise8 assembly code.
+         */
+        . = ( STM32MP1_BL32_BASE - STM32MP1_BINARY_BASE );
+        __BL32_IMAGE_START__ = .;
+        *(.bl32_image*)
+        __BL32_IMAGE_END__ = .;
+
+        __DATA_END__ = .;
+    } >RAM
+
+    __TF_END__ = .;
+
+}
+#endif /*__STM32MP1_LD_S__*/