[U-Boot] [PATCH 10/13 v5] Makefile: Add Kconfig option CONFIG_SPL_IMAGE to select the SPL binary

[Stefan Roese]

This patch adds the CONFIG_SPL_IMAGE option to select the SPL image that
shall be used to generate the combined SPL + U-Boot image. The default
value is the current value "spl/u-boot-spl.bin".

This patch also sets CONFIG_SPL_IMAGE to "spl/boot.bin" for AT91 targets
which use SPL NAND support (boot from NAND). For these build targets the
combined image "u-boot-with-spl.bin" is now automatically generated and
can be programmed into NAND as one single image (vs. SPL image and U-Boot
as 2 separate images).

Signed-off-by: Stefan Roese <sr at denx.de>
Cc: Heiko Schocher <hs at denx.de>
Cc: Andreas Bießmann <andreas at biessmann.org>
Cc: Eugen Hristev <eugen.hristev at microchip.com>
---
v5:
- Re-phrase Kconfig text to better describe the meaning of this
  Kconfig option

v3:
- No change

v2:
- No change

 Kconfig  | 11 +++++++++++
 Makefile |  4 +++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/Kconfig b/Kconfig
index 305b265ed7..7a5491bd67 100644
--- a/Kconfig
+++ b/Kconfig
@@ -224,6 +224,16 @@ config BUILD_ROM
 	  which are not shipped in the U-Boot source tree.
 	  Please, see doc/README.x86 for details.
 
+config SPL_IMAGE
+	string "SPL image used in the combined SPL+U-Boot image"
+	default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
+	default "spl/u-boot-spl.bin"
+	help
+	  Select the SPL build target that shall be generated by the SPL
+	  build process (default spl/u-boot-spl.bin). This image will be
+	  used to generate a combined image with SPL and main U-Boot
+	  proper as one single image.
+
 config BUILD_TARGET
 	string "Build target special images"
 	default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
@@ -232,6 +242,7 @@ config BUILD_TARGET
 	default "u-boot-elf.srec" if RCAR_GEN3
 	default "u-boot.itb" if SPL_LOAD_FIT && ARCH_SUNXI
 	default "u-boot.kwb" if KIRKWOOD
+	default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
 	help
 	  Some SoCs need special image types (e.g. U-Boot binary
 	  with a special header) as build targets. By defining
diff --git a/Makefile b/Makefile
index c1af9307b3..077bb6634e 100644
--- a/Makefile
+++ b/Makefile
@@ -1225,9 +1225,11 @@ else
 SPL_PAYLOAD := u-boot.bin
 endif
 
+SPL_IMAGE := $(CONFIG_SPL_IMAGE:"%"=%)
+
 OBJCOPYFLAGS_u-boot-with-spl.bin = -I binary -O binary \
 				   --pad-to=$(CONFIG_SPL_PAD_TO)
-u-boot-with-spl.bin: spl/u-boot-spl.bin $(SPL_PAYLOAD) FORCE
+u-boot-with-spl.bin: $(SPL_IMAGE) $(SPL_PAYLOAD) FORCE
 	$(call if_changed,pad_cat)
 
 ifeq ($(CONFIG_ARCH_LPC32XX)$(CONFIG_SPL),yy)
-- 
2.21.0