exynos: Install the BL1 and set the checksum in the Makefile.

Install the BL1 and set up the checksum in the Makefile instead of relying on
post processing. Import the exynos checksum script, split it in two and
simplify it significantly. Stop putting the CBFS header in the midst of the
bootblock so that it can be checksummed before CBFS is put together. Stop
saving space for it and leaving an anchor in the bootblock which nobody looks
for.

Change-Id: Icbb5a5914ece60b2827433b6dc29d80db996ea6c
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://chromium-review.googlesource.com/179229
Reviewed-by: Ronald Minnich <rminnich@chromium.org>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>
(cherry picked from commit aa3a416705517c0a6ddfdeb19905ac8cafb33df1)
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6834
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/soc/samsung/exynos5420/Makefile.inc b/src/soc/samsung/exynos5420/Makefile.inc
index ef77b1b..5f37e7e 100644
--- a/src/soc/samsung/exynos5420/Makefile.inc
+++ b/src/soc/samsung/exynos5420/Makefile.inc
@@ -50,13 +50,10 @@
 ramstage-y += usb.c
 ramstage-y += cbmem.c
 
-# Run an intermediate step when producing coreboot.rom
-# that adds additional components to the final firmware
-# image outside of CBFS
-.PHONY: exynos5420_add_bl1
-$(obj)/coreboot.rom: exynos5420_add_bl1
-exynos5420_add_bl1: $(obj)/coreboot.pre
-	printf "    DD         Adding Samsung Exynos5420 BL1\n"
-	# TODO(hungte) Change this 'cpu' to soc when build scripts are changed.
-	dd if=3rdparty/cpu/samsung/exynos5420/bl1.bin \
-		of=$(obj)/coreboot.pre conv=notrunc >/dev/null 2>&1
+$(objcbfs)/bootblock.raw.elf: $(objcbfs)/bootblock.elf
+	cp $< $@
+
+$(objcbfs)/bootblock.bin: $(objcbfs)/bootblock.raw.bin
+	@printf "    BL1, CKSUM $(subst $(obj)/,,$(@))\n"
+	util/exynos/variable_cksum.py $< $<.cksum
+	cat 3rdparty/cpu/samsung/exynos5420/bl1.bin $<.cksum > $@