ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/scripts/sercomm-kernel-header.py b/scripts/sercomm-kernel-header.py
new file mode 100755
index 0000000..40bcbb1
--- /dev/null
+++ b/scripts/sercomm-kernel-header.py
@@ -0,0 +1,121 @@
+#!/usr/bin/env python3
+"""
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# sercomm-kernel-header.py: Creates Sercomm kernel header
+#
+# Copyright © 2022 Mikhail Zhilkin
+"""
+
+import argparse
+import binascii
+import os
+import struct
+
+KERNEL_HEADER_SIZE = 0x100
+PADDING = 0xff
+ROOTFS_FAKE_HEADER = "UBI#"
+
+def auto_int(x):
+ return int(x, 0)
+
+def create_kernel_header(args):
+ out_file = open(args.header_file, "wb")
+ header = get_kernel_header(args)
+ out_file.write(header)
+ out_file.close()
+
+def get_kernel_header(args):
+ header = bytearray([PADDING] * KERNEL_HEADER_SIZE)
+
+ struct.pack_into('<L', header, 0xc, 0xffffff02)
+ struct.pack_into('<L', header, 0x1c, 0x0)
+ struct.pack_into('<L', header, 0x34, 0x0)
+ struct.pack_into('<L', header, 0x10, args.kernel_offset)
+ struct.pack_into('<L', header, 0x28, args.rootfs_offset)
+
+ if (args.rootfs_file):
+ if (args.rootfs_checking_size):
+ rootfs_size = args.rootfs_checking_size
+ else:
+ rootfs_size = os.path.getsize(args.rootfs_file)
+ buf = open(args.rootfs_file,'rb').read(rootfs_size)
+ crc = binascii.crc32(buf) & 0xffffffff
+ else:
+ rootfs_size = len(ROOTFS_FAKE_HEADER)
+ crc = binascii.crc32(str.encode(ROOTFS_FAKE_HEADER)) & \
+ 0xffffffff
+ struct.pack_into('<L', header, 0x2c, rootfs_size)
+ struct.pack_into('<L', header, 0x30, crc)
+
+ kernel_size = os.path.getsize(args.kernel_file)
+ struct.pack_into('<L', header, 0x14, kernel_size)
+
+ kernel_end_offset = args.kernel_offset + kernel_size
+ struct.pack_into('<L', header, 0x4, kernel_end_offset)
+
+ buf = open(args.kernel_file,'rb').read()
+ crc = binascii.crc32(buf) & 0xffffffff
+ struct.pack_into('<L', header, 0x18, crc)
+
+ crc = binascii.crc32(header) & 0xffffffff
+ struct.pack_into('<L', header, 0x8, crc)
+
+ struct.pack_into('<L', header, 0x0, 0x726553)
+
+ return header
+
+def main():
+ global args
+
+ parser = argparse.ArgumentParser(description='This script generates \
+ a kernel header for the Sercomm mt7621 devices')
+
+ parser.add_argument('--kernel-image',
+ dest='kernel_file',
+ action='store',
+ type=str,
+ help='Path to a Kernel binary image')
+
+ parser.add_argument('--kernel-offset',
+ dest='kernel_offset',
+ action='store',
+ type=auto_int,
+ help='Kernel offset')
+
+ parser.add_argument('--rootfs-offset',
+ dest='rootfs_offset',
+ action='store',
+ type=auto_int,
+ help='RootFS offset')
+
+ parser.add_argument('--output-header',
+ dest='header_file',
+ action='store',
+ type=str,
+ help='Output kernel header file')
+
+ parser.add_argument('--rootfs-image',
+ dest='rootfs_file',
+ action='store',
+ type=str,
+ help='Path to RootFS binary image (optional)')
+
+ parser.add_argument('--rootfs-checking-size',
+ dest='rootfs_checking_size',
+ action='store',
+ type=auto_int,
+ help='Bytes count for CRC calculation (optional)')
+
+ args = parser.parse_args()
+
+ if ((not args.kernel_file) or
+ (not args.kernel_offset) or
+ (not args.rootfs_offset) or
+ (not args.header_file)):
+ parser.print_help()
+ exit()
+
+ create_kernel_header(args)
+
+main()