mediatek/mt8173: Add gen-bl-img.py for mt8173 bootblock code

The mt8173 boot rom expects the bootblock to be in a certain format.
gen-bl-img wraps our bootblock appropriately.

BUG=none
TEST=emerge-oak coreboot
BRANCH=none

Change-Id: I7486e548d356c5bd27261851f1f1bed620715e91
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: fbcd7959e0fda595de91899ace7236037ac833d3
Original-Change-Id: Ib9df440bfa95cf06e8041491ecdb34c357047acd
Original-Signed-off-by: Yidi Lin <yidi.lin@mediatek.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/292664
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/12613
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/soc/mediatek/mt8173/Makefile.inc

@@ -61,6 +61,10 @@ ramstage-y += wdt.c
 
 ################################################################################
 
+# Generate the actual coreboot bootblock code
+$(objcbfs)/bootblock.bin: $(objcbfs)/bootblock.raw.bin
+	./util/mtkheader/gen-bl-img.py mt8173 sf $< $@
+
 CPPFLAGS_common += -Isrc/soc/mediatek/mt8173/include
 
 endif

util/mtkheader/gen-bl-img.py

@@ -0,0 +1,92 @@
+#!/usr/bin/env python
+
+#
+# This file is part of the coreboot project.
+#
+# Copyright (c) 2015 MediaTek Inc.
+# Author: Tristan Shieh <tristan.shieh@mediatek.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+
+
+import struct
+import sys
+import hashlib
+
+def read(path):
+	with open(path, "rb") as f:
+		return f.read()
+
+def write(path, data):
+	with open(path, "wb") as f:
+		f.write(data)
+
+def padding(data, size, pattern = '\0'):
+	return data + pattern * (size - len(data))
+
+def align(data, size, pattern = '\0'):
+	return padding(data, (len(data) + (size - 1)) & ~(size - 1), pattern)
+
+gfh_infos = {
+	'mt8173': struct.pack("44I",
+	0x014d4d4d, 0x00000038, 0x454c4946, 0x464e495f,
+	0x0000004f, 0x00000001, 0x01050001, 0x000C0f50,
+	0xffffffff, 0x00020000, 0x000000a8, 0x00000020,
+	0x000000B0, 0x00000001, 0x014d4d4d, 0x0001000c,
+	0x00000001, 0x034d4d4d, 0x00070064, 0x00001182,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00006400, 0x00001388,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000,
+    )}
+
+def gen_emmc_header(data):
+	header = (padding(struct.pack("<12sII", "EMMC_BOOT", 1, 512), 512, '\xff') +
+		  padding(struct.pack("<8sIIIIIIII", "BRLYT", 1, 2048, 2048 + len(data),
+			0x42424242, 0x00010005, 2048, 2048 + len(data), 1) + '\0' * 140, 512, '\xff') +
+		  '\0' * 1024)
+	return header
+
+def gen_sf_header(data):
+	header = (padding(struct.pack("<12sII", "SF_BOOT", 1, 512), 512, '\xff') +
+		  padding(struct.pack("<8sIIIIIIII", "BRLYT", 1, 2048, 2048 + len(data),
+			0x42424242, 0x00010007, 2048, 2048 + len(data), 1) + '\0' * 140, 512, '\xff') +
+		  '\0' * 1024)
+	return header
+
+gen_dev_header = {
+	"emmc": gen_emmc_header,
+	"sf": gen_sf_header
+}
+
+def gen_preloader(chip_ver, flash_type, data):
+	gfh_info = gfh_infos[chip_ver]
+	gfh_info = gfh_info[0:32] + struct.pack("1I", len(data)+len(gfh_info)+32) + gfh_info[36:len(gfh_info)]
+
+	gfh_hash = hashlib.sha256(gfh_info + data).digest()
+
+	data = align(gfh_info + data + gfh_hash, 512, '\xff')
+	header = gen_dev_header[flash_type](data)
+	return header + data
+
+def main(argv):
+	if len(argv) != 5:
+		print "Usage: %s <chip> <flash_type> <input_file> <output_file>" % argv[0]
+		print "\t flash_type: emmc/sf"
+		print "\t chip      : mt8173"
+
+		exit(1)
+	write(argv[4], gen_preloader(argv[1], argv[2], read(argv[3])))
+
+if __name__ == "__main__":
+	main(sys.argv)