sunxi: Support building a SPL as a TOC0 image

Now that mkimage can generate TOC0 images, and the SPL can interpret
them, hook up the build infrastructure so the user can choose which
image type to build. Since the absolute load address is stored in the
TOC0 header, that information must be passed to mkimage.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>

arch/arm/mach-sunxi/Kconfig

@@ -1047,6 +1047,8 @@ config BLUETOOTH_DT_DEVICE_FIXUP
 	  The used address is "bdaddr" if set, and "ethaddr" with the LSB
 	  flipped elsewise.
 
+source "board/sunxi/Kconfig"
+
 endif
 
 config CHIP_DIP_SCAN

board/sunxi/Kconfig

@@ -0,0 +1,24 @@
+choice
+	prompt "SPL Image Type"
+	default SPL_IMAGE_TYPE_SUNXI_EGON
+
+config SPL_IMAGE_TYPE_SUNXI_EGON
+	bool "eGON (normal)"
+	help
+	  Select this option to embed the SPL binary in an eGON.BT0 image,
+	  which is compatible with the normal boot ROM (NBROM).
+
+	  This is usually the correct option to choose.
+
+config SPL_IMAGE_TYPE_SUNXI_TOC0
+	bool "TOC0 (secure)"
+	help
+	  Select this option to embed the SPL binary in a TOC0 image,
+	  which is compatible with the secure boot ROM (SBROM).
+
+endchoice
+
+config SPL_IMAGE_TYPE
+	string
+	default "sunxi_egon" if SPL_IMAGE_TYPE_SUNXI_EGON
+	default "sunxi_toc0" if SPL_IMAGE_TYPE_SUNXI_TOC0

scripts/Makefile.spl

@@ -411,7 +411,10 @@ endif
 $(obj)/$(SPL_BIN).sfp: $(obj)/$(SPL_BIN).bin FORCE
 	$(call if_changed,mkimage)
 
-MKIMAGEFLAGS_sunxi-spl.bin = -A $(ARCH) -T sunxi_egon \
+MKIMAGEFLAGS_sunxi-spl.bin = \
+	-A $(ARCH) \
+	-T $(CONFIG_SPL_IMAGE_TYPE) \
+	-a $(CONFIG_SPL_TEXT_BASE) \
 	-n $(CONFIG_DEFAULT_DEVICE_TREE)
 
 OBJCOPYFLAGS_u-boot-spl-dtb.hex := -I binary -O ihex --change-address=$(CONFIG_SPL_TEXT_BASE)