boot/opensbi: allow using U-Boot as a payload

The opensbi package already allows to use Linux as a payload for
OpenSBI, but in some cases, U-Boot as payload is useful. This commit
adds a BR2_TARGET_OPENSBI_UBOOT_PAYLOAD option, modeled after the
existing BR2_TARGET_OPENSBI_LINUX_PAYLOAD.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

boot/opensbi/Config.in

@@ -82,4 +82,11 @@ config BR2_TARGET_OPENSBI_LINUX_PAYLOAD
 	help
 	  Build OpenSBI with the Linux kernel as a Payload.
 
+config BR2_TARGET_OPENSBI_UBOOT_PAYLOAD
+	bool "Include U-Boot as OpenSBI Payload"
+	depends on BR2_TARGET_OPENSBI_PLAT != ""
+	depends on BR2_TARGET_UBOOT
+	help
+	  Build OpenSBI with the U-Boot as a Payload.
+
 endif

boot/opensbi/opensbi.mk

@@ -41,6 +41,11 @@ OPENSBI_DEPENDENCIES += linux
 OPENSBI_MAKE_ENV += FW_PAYLOAD_PATH="$(BINARIES_DIR)/Image"
 endif
 
+ifeq ($(BR2_TARGET_OPENSBI_UBOOT_PAYLOAD),y)
+OPENSBI_DEPENDENCIES += uboot
+OPENSBI_MAKE_ENV += FW_PAYLOAD_PATH="$(BINARIES_DIR)/u-boot.bin"
+endif
+
 define OPENSBI_BUILD_CMDS
 	$(TARGET_MAKE_ENV) $(OPENSBI_MAKE_ENV) $(MAKE) -C $(@D)
 endef
@@ -51,6 +56,9 @@ OPENSBI_FW_IMAGES += jump dynamic
 ifeq ($(BR2_TARGET_OPENSBI_LINUX_PAYLOAD),y)
 OPENSBI_FW_IMAGES += payload
 endif
+ifeq ($(BR2_TARGET_OPENSBI_UBOOT_PAYLOAD),y)
+OPENSBI_FW_IMAGES = payload
+endif
 endif
 
 define OPENSBI_INSTALL_IMAGES_CMDS