boot/uboot: copy ATF bl31 binary to uboot package dir

If the ATF binary is used by U-Boot, the file is expected to be in the
toplevel directory.

Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

boot/uboot/uboot.mk

@@ -162,8 +162,16 @@ ifeq ($(BR2_TARGET_UBOOT_NEEDS_ATF_BL31),y)
 UBOOT_DEPENDENCIES += arm-trusted-firmware
 ifeq ($(BR2_TARGET_UBOOT_NEEDS_ATF_BL31_ELF),y)
 UBOOT_MAKE_OPTS += BL31=$(BINARIES_DIR)/bl31.elf
+define UBOOT_COPY_ATF_FIRMWARE
+	cp $(BINARIES_DIR)/bl31.elf $(@D)/
+endef
+UBOOT_PRE_BUILD_HOOKS += UBOOT_COPY_ATF_FIRMWARE
 else
 UBOOT_MAKE_OPTS += BL31=$(BINARIES_DIR)/bl31.bin
+define UBOOT_COPY_ATF_FIRMWARE
+	cp $(BINARIES_DIR)/bl31.bin $(@D)/
+endef
+UBOOT_PRE_BUILD_HOOKS += UBOOT_COPY_ATF_FIRMWARE
 endif
 endif