stm32mp1: check boot device only for BL2 compilation

The boot device is now checked inside a dedicated rule, that is only
called during BL2 compilation step

Change-Id: Ie7bcd1f166285224b0c042238989a82f7b6105c6
Signed-off-by: Yann Gautier <yann.gautier@st.com>
Reviewed-on: https://gerrit.st.com/c/mpu/oe/st/tf-a/+/183646


Reviewed-by: CITOOLS <smet-aci-reviews@lists.codex.cro.st.com>
Reviewed-by: CIBUILD <smet-aci-builds@lists.codex.cro.st.com>
Reviewed-by: Lionel DEBIEVE <lionel.debieve@st.com>

plat/st/stm32mp1/platform.mk

@@ -72,12 +72,6 @@ STM32MP_SPI_NOR		?=	0
 STM32MP_USB_PROGRAMMER	?=	0
 STM32MP_UART_PROGRAMMER	?=	0
 
-ifeq ($(filter 1,${STM32MP_EMMC} ${STM32MP_SDMMC} ${STM32MP_RAW_NAND} \
-	${STM32MP_SPI_NAND} ${STM32MP_SPI_NOR} \
-	${STM32MP_UART_PROGRAMMER} ${STM32MP_USB_PROGRAMMER}),)
-$(error "No boot device driver is enabled")
-endif
-
 # Device tree
 DTB_FILE_NAME		?=	stm32mp157c-ev1.dtb
 ifeq ($(STM32MP_USE_STM32IMAGE),1)
@@ -332,13 +326,27 @@ BL2_SOURCES		+=	plat/st/stm32mp1/stm32mp1_critic_power.c
 BL2_SOURCES		+=	plat/st/stm32mp1/stm32mp1_critic_power_wrapper.S
 
 # Compilation rules
-.PHONY: check_dtc_version stm32image clean_stm32image
+.PHONY: check_dtc_version stm32image clean_stm32image check_boot_device
 .SUFFIXES:
 
 all: check_dtc_version stm32image ${STM32_TF_STM32}
 
 distclean realclean clean: clean_stm32image
 
+bl2: check_boot_device
+
+check_boot_device:
+	@if [ ${STM32MP_EMMC} != 1 ] && \
+	    [ ${STM32MP_SDMMC} != 1 ] && \
+	    [ ${STM32MP_RAW_NAND} != 1 ] && \
+	    [ ${STM32MP_SPI_NAND} != 1 ] && \
+	    [ ${STM32MP_SPI_NOR} != 1 ] && \
+	    [ ${STM32MP_UART_PROGRAMMER} != 1 ] && \
+	    [ ${STM32MP_USB_PROGRAMMER} != 1 ]; then \
+		echo "No boot device driver is enabled"; \
+		false; \
+	fi
+
 stm32image: ${STM32IMAGE}
 
 ${STM32IMAGE}: ${STM32IMAGE_SRC}