imx: Add u-boot-with-spl.imx make target

This image combines the SPL with the i.MX header and U-Boot. This is a
convenient way of having a single image to program on some boot devices.

The i.MX header has to be added to the SPL before appending U-Boot, so that the
boot ROM loads only the SPL.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
diff --git a/arch/arm/imx-common/Makefile b/arch/arm/imx-common/Makefile
index 428a57e..f59ae6f 100644
--- a/arch/arm/imx-common/Makefile
+++ b/arch/arm/imx-common/Makefile
@@ -55,6 +55,12 @@
 	$(OBJTREE)/tools/mkimage -n $(filter-out %.bin,$^) -T imximage \
 	-e $(CONFIG_SPL_TEXT_BASE) -d $< $@
 
+$(OBJTREE)/u-boot-with-spl.imx: $(OBJTREE)/SPL $(OBJTREE)/u-boot.bin
+	$(OBJCOPY) ${OBJCFLAGS} --pad-to=$(CONFIG_SPL_PAD_TO) \
+		-I binary -O binary $< $(OBJTREE)/spl/u-boot-spl-pad.imx
+	cat $(OBJTREE)/spl/u-boot-spl-pad.imx $(OBJTREE)/u-boot.bin > $@
+	rm $(OBJTREE)/spl/u-boot-spl-pad.imx
+
 
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