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>

7 files changed, 142 insertions, 39 deletions

diff --git a/src/arch/arm/armv7/bootblock.S b/src/arch/arm/armv7/bootblock.S
index b28a787839..82bd79e19a 100644
--- a/src/arch/arm/armv7/bootblock.S
+++ b/src/arch/arm/armv7/bootblock.S
@@ -31,17 +31,7 @@
 
 .section ".start", "a", %progbits
 .globl _start
-_start: b	reset
-	.balignl 16,0xdeadbeef
-
-_cbfs_master_header:
-	/* The CBFS master header is inserted by cbfstool at the first
-	 * aligned offset after the above anchor string is found.
-	 * Hence, we leave some space for it.
-	 */
-	.skip 128			@ Assumes 64-byte alignment
-
-reset:
+_start:
 	/*
 	 * Set the cpu to System mode with IRQ and FIQ disabled. Prefetch/Data
 	 * aborts may happen early and crash before the abort handlers are
diff --git a/src/soc/samsung/exynos5250/Kconfig b/src/soc/samsung/exynos5250/Kconfig
index 2b4ad3995b..8d7c867fe0 100644
--- a/src/soc/samsung/exynos5250/Kconfig
+++ b/src/soc/samsung/exynos5250/Kconfig
@@ -15,21 +15,22 @@ if CPU_SAMSUNG_EXYNOS5250
 #
 # 0x0000: vendor-provided BL1 (8k).
 # 0x2000: bootblock
-#  0x2010-0x2090: reserved for CBFS master header.
-# 0xA000: Free for CBFS data.
+# 0x9FFC-0xA000: BL2 checksum
+# 0xA000-0xA080: reserved for CBFS master header.
+# 0xA080: Free for CBFS data.
 
 config BOOTBLOCK_ROM_OFFSET
 	hex
-	default 0x2000
+	default 0
 
 config CBFS_HEADER_ROM_OFFSET
 	hex "offset of master CBFS header in ROM"
-	default 0x2010
+	default 0x9F80
 
 config CBFS_ROM_OFFSET
 	# Calculated by BOOTBLOCK_ROM_OFFSET + max bootblock size.
 	hex "offset of CBFS data in ROM"
-	default 0x0A000
+	default 0x0A080
 
 config SYS_SDRAM_BASE
 	hex
diff --git a/src/soc/samsung/exynos5250/Makefile.inc b/src/soc/samsung/exynos5250/Makefile.inc
index a15bc9c6a3..cc89f2d7b5 100644
--- a/src/soc/samsung/exynos5250/Makefile.inc
+++ b/src/soc/samsung/exynos5250/Makefile.inc
@@ -50,13 +50,10 @@ ramstage-y += fb.c
 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: exynos5250_add_bl1
-$(obj)/coreboot.rom: exynos5250_add_bl1
-exynos5250_add_bl1: $(obj)/coreboot.pre
-	printf "    DD         Adding Samsung Exynos5250 BL1\n"
-	# TODO(hungte) Change this 'cpu' to soc when build scripts are changed.
-	dd if=3rdparty/cpu/samsung/exynos5250/bl1.bin \
-		of=$(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/fixed_cksum.py $< $<.cksum 32768
+	cat 3rdparty/cpu/samsung/exynos5250/bl1.bin $<.cksum > $@
diff --git a/src/soc/samsung/exynos5420/Kconfig b/src/soc/samsung/exynos5420/Kconfig
index a0d6c9882c..904091e5ba 100644
--- a/src/soc/samsung/exynos5420/Kconfig
+++ b/src/soc/samsung/exynos5420/Kconfig
@@ -17,16 +17,16 @@ if CPU_SAMSUNG_EXYNOS5420
 # 0x0000: vendor-provided BL1 (8k).
 # 0x2000: variable length bootblock checksum header
 # 0x2010: bootblock
-#  0x2020-0x20A0: reserved for CBFS master header.
+#  0x9F80-0xA000: reserved for CBFS master header.
 # 0xA000: Free for CBFS data.
 
 config BOOTBLOCK_ROM_OFFSET
 	hex
-	default 0x2010
+	default 0
 
 config CBFS_HEADER_ROM_OFFSET
 	hex "offset of master CBFS header in ROM"
-	default 0x2020
+	default 0x9F80
 
 config CBFS_ROM_OFFSET
 	# Calculated by BOOTBLOCK_ROM_OFFSET + max bootblock size.
diff --git a/src/soc/samsung/exynos5420/Makefile.inc b/src/soc/samsung/exynos5420/Makefile.inc
index ef77b1b728..5f37e7eba5 100644
--- a/src/soc/samsung/exynos5420/Makefile.inc
+++ b/src/soc/samsung/exynos5420/Makefile.inc
@@ -50,13 +50,10 @@ ramstage-y += dp.c dp_lowlevel.c fimd.c
 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 > $@
diff --git a/util/exynos/fixed_cksum.py b/util/exynos/fixed_cksum.py
new file mode 100755
index 0000000000..66da06025d
--- /dev/null
+++ b/util/exynos/fixed_cksum.py
@@ -0,0 +1,59 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2013 Google Inc.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+# 3. The name of the author may not be used to endorse or promote products
+#    derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+
+"""
+This utility computes and fills Exynos ROM checksum (for BL1 or BL2).
+(Algorithm from U-Boot: tools/mkexynosspl.c)
+
+Input: IN OUT DATA_SIZE
+
+Output:
+
+  IN padded out to DATA_SIZE, checksum at the end, written to OUT.
+"""
+
+import struct
+import sys
+
+def main(argv):
+  if len(argv) != 4:
+    exit('usage: %s IN OUT DATA_SIZE' % argv[0])
+
+  in_name, out_name = argv[1:3]
+  size = int(argv[3], 0)
+  checksum_format = "<I"
+  with open(in_name, "rb") as in_file, open(out_name, "wb") as out_file:
+    data = in_file.read()
+    checksum_size = struct.calcsize(checksum_format)
+    data_size = size - checksum_size
+    assert len(data) <= data_size
+    checksum = struct.pack(checksum_format, sum(map(ord, data)))
+    out_file.write(data + bytearray(data_size - len(data)) + checksum)
+
+
+if __name__ == '__main__':
+  main(sys.argv)
diff --git a/util/exynos/variable_cksum.py b/util/exynos/variable_cksum.py
new file mode 100755
index 0000000000..75cdc74f87
--- /dev/null
+++ b/util/exynos/variable_cksum.py
@@ -0,0 +1,59 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2013 Google Inc.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+# 3. The name of the author may not be used to endorse or promote products
+#    derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+
+"""
+This utility computes and fills Exynos ROM checksum (for BL1 or BL2).
+(Algorithm from U-Boot: tools/mkexynosspl.c)
+
+Input: IN OUT
+
+Output:
+
+  Checksum header added to IN and written to OUT.
+  Header: uint32_t size, checksum, reserved[2].
+"""
+
+import struct
+import sys
+
+def main(argv):
+  if len(argv) != 3:
+    exit('usage: %s IN OUT' % argv[0])
+
+  in_name, out_name = argv[1:3]
+  header_format = "<IIII"
+  with open(in_name, "rb") as in_file, open(out_name, "wb") as out_file:
+    data = in_file.read()
+    header = struct.pack(header_format,
+                         struct.calcsize(header_format) + len(data),
+                         sum(map(ord, data)),
+                         0, 0)
+    out_file.write(header + data)
+
+
+if __name__ == '__main__':
+  main(sys.argv)