ipq806x: Creates u-boot.mbn by adding mbn header

Adds support to add mbn header to u-boot.bin as mbn header is needed by
sbl of all boards with ipq806x soc. A python script at tools/mkheader.py
is included which creates u-boot.mbn from u-boot.bin.

Change-Id: I070d82d9af0ed772cd4970b8fde152a8e3068823
Signed-off-by: Gokul Sriram Palanisamy <gpalan@codeaurora.org>

Makefile

@@ -771,6 +771,7 @@ ifneq ($(BUILD_ROM),)
 ALL-$(CONFIG_X86_RESET_VECTOR) += u-boot.rom
 endif
 
+ALL-$(CONFIG_MBN_HEADER) += u-boot.mbn
 # enable combined SPL/u-boot/dtb rules for tegra
 ifneq ($(CONFIG_TEGRA),)
 ifeq ($(CONFIG_SPL),y)
@@ -877,6 +878,12 @@ u-boot.bin: u-boot FORCE
 	$(call DO_STATIC_RELA,$<,$@,$(CONFIG_SYS_TEXT_BASE))
 	$(BOARD_SIZE_CHECK)
 
+quiet_cmd_mkheader = MKHEADER $@
+cmd_mkheader = $(PYTHON) tools/mkheader.py $(CONFIG_SYS_TEXT_BASE) $(CONFIG_IPQ_APPSBL_IMG_TYPE) $< $@
+
+u-boot.mbn: u-boot.bin
+		$(call if_changed,mkheader)
+
 u-boot.ldr:	u-boot
 		$(CREATE_LDR_ENV)
 		$(LDR) -T $(CONFIG_CPU) -c $@ $< $(LDR_FLAGS)

include/configs/ipq806x.h

@@ -43,6 +43,9 @@
 #define CONFIG_BOOTARGS			"console=ttyMSM0,115200n8"
 #define CONFIG_SYS_HUSH_PARSER
 
+#define CONFIG_MBN_HEADER
+#define CONFIG_IPQ_APPSBL_IMG_TYPE	0x5
+
 #undef CONFIG_IPQ806X_USB
 #ifdef CONFIG_IPQ806X_USB
 #define CONFIG_USB_XHCI

tools/mkheader.py

@@ -0,0 +1,105 @@
+#
+# Copyright (c) 2014-2016 The Linux Foundation. All rights reserved.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 and
+# only version 2 as published by the Free Software Foundation.
+#
+# 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 sys
+import struct
+
+def create_header(base, size, img_type):
+    """Returns a packed MBN header image with the specified base and size.
+
+    @arg base: integer, specifies the image load address in RAM
+    @arg size: integer, specifies the size of the image
+    @arg img_type: integer, specifies the image type
+    @returns: string, the MBN header
+    """
+
+    header = [
+        img_type,    # Type: APPSBL
+        0x3,         # Version: 3
+        0x0,         # Image source pointer
+        base,        # Image destination pointer
+        size,        # Code Size + Cert Size + Signature Size
+        size,        # Code Size
+        base + size, # Destination + Code Size
+        0x0,         # Signature Size
+        base + size, # Destination + Code Size + Signature Size
+        0x0,         # Cert Size
+    ]
+
+    header_packed = struct.pack('<10I', *header)
+    return header_packed
+
+def mkheader(base_addr, img_type, infname, outfname):
+    """Prepends the image with the MBN header.
+
+    @arg base_addr: integer, specifies the image load address in RAM
+    @arg img_type: integer, specifies the image type
+    @arg infname: string, image filename
+    @arg outfname: string, output image with header prepended
+    @raises IOError: if reading/writing input/output file fails
+    """
+    with open(infname, "rb") as infp:
+        image = infp.read()
+        insize = len(image)
+
+    if base_addr > 0xFFFFFFFF:
+        raise ValueError("invalid base address")
+
+    if base_addr + insize > 0xFFFFFFFF:
+        raise ValueError("invalid destination range")
+
+    header = create_header(base_addr, insize, img_type)
+    with open(outfname, "wb") as outfp:
+        outfp.write(header)
+        outfp.write(image)
+
+def usage(msg=None):
+    """Print command usage.
+
+    @arg msg: string, error message if any (default: None)
+    """
+    if msg != None:
+        sys.stderr.write("mkheader: %s\n" % msg)
+
+    print "Usage: mkheader.py <base-addr> <img_type> <input-file> <output-file>"
+
+    if msg != None:
+        exit(1)
+
+def main():
+    """Main entry function"""
+
+    if len(sys.argv) != 5:
+        usage("incorrect no. of arguments")
+
+    try:
+        base_addr = int(sys.argv[1], 0)
+        img_type = int(sys.argv[2], 0)
+        infname = sys.argv[3]
+        outfname = sys.argv[4]
+    except ValueError as e:
+        sys.stderr.write("mkheader: invalid base address '%s'\n" % sys.argv[1])
+        exit(1)
+
+    try:
+        mkheader(base_addr, img_type,  infname, outfname)
+    except IOError as e:
+        sys.stderr.write("mkheader: %s\n" % e)
+        exit(1)
+    except ValueError as e:
+        sys.stderr.write("mkheader: %s\n" % e)
+        exit(1)
+
+if __name__ == "__main__":
+    main()
+