diff --git a/scripts/mkbootimg b/scripts/mkbootimg
new file mode 100755
index 0000000000..c3e09aba34
--- /dev/null
+++ b/scripts/mkbootimg
@@ -0,0 +1,234 @@
+#!/usr/bin/env python
+# Copyright 2015, The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import print_function
+from sys import argv, exit, stderr
+from argparse import ArgumentParser, FileType, Action
+from os import fstat
+from struct import pack
+from hashlib import sha1
+import sys
+import re
+
+def filesize(f):
+    if f is None:
+        return 0
+    try:
+        return fstat(f.fileno()).st_size
+    except OSError:
+        return 0
+
+
+def update_sha(sha, f):
+    if f:
+        sha.update(f.read())
+        f.seek(0)
+        sha.update(pack('I', filesize(f)))
+    else:
+        sha.update(pack('I', 0))
+
+
+def pad_file(f, padding):
+    pad = (padding - (f.tell() & (padding - 1))) & (padding - 1)
+    f.write(pack(str(pad) + 'x'))
+
+
+def get_number_of_pages(image_size, page_size):
+    """calculates the number of pages required for the image"""
+    return (image_size + page_size - 1) / page_size
+
+
+def get_recovery_dtbo_offset(args):
+    """calculates the offset of recovery_dtbo image in the boot image"""
+    num_header_pages = 1 # header occupies a page
+    num_kernel_pages = get_number_of_pages(filesize(args.kernel), args.pagesize)
+    num_ramdisk_pages = get_number_of_pages(filesize(args.ramdisk), args.pagesize)
+    num_second_pages = get_number_of_pages(filesize(args.second), args.pagesize)
+    dtbo_offset = args.pagesize * (num_header_pages + num_kernel_pages +
+                                   num_ramdisk_pages + num_second_pages)
+    return dtbo_offset
+
+
+def write_header(args):
+    BOOT_IMAGE_HEADER_V1_SIZE = 1648
+    BOOT_IMAGE_HEADER_V2_SIZE = 1660
+    BOOT_MAGIC = 'ANDROID!'.encode()
+
+    if (args.header_version > 2):
+        raise ValueError('Boot header version %d not supported' % args.header_version)
+
+    args.output.write(pack('8s', BOOT_MAGIC))
+    final_ramdisk_offset = (args.base + args.ramdisk_offset) if filesize(args.ramdisk) > 0 else 0
+    final_second_offset = (args.base + args.second_offset) if filesize(args.second) > 0 else 0
+    args.output.write(pack('10I',
+        filesize(args.kernel),                          # size in bytes
+        args.base + args.kernel_offset,                 # physical load addr
+        filesize(args.ramdisk),                         # size in bytes
+        final_ramdisk_offset,                           # physical load addr
+        filesize(args.second),                          # size in bytes
+        final_second_offset,                            # physical load addr
+        args.base + args.tags_offset,                   # physical addr for kernel tags
+        args.pagesize,                                  # flash page size we assume
+        args.header_version,                            # version of bootimage header
+        (args.os_version << 11) | args.os_patch_level)) # os version and patch level
+    args.output.write(pack('16s', args.board.encode())) # asciiz product name
+    args.output.write(pack('512s', args.cmdline[:512].encode()))
+
+    sha = sha1()
+    update_sha(sha, args.kernel)
+    update_sha(sha, args.ramdisk)
+    update_sha(sha, args.second)
+
+    if args.header_version > 0:
+        update_sha(sha, args.recovery_dtbo)
+    if args.header_version > 1:
+        update_sha(sha, args.dtb)
+
+    img_id = pack('32s', sha.digest())
+
+    args.output.write(img_id)
+    args.output.write(pack('1024s', args.cmdline[512:].encode()))
+
+    if args.header_version > 0:
+        args.output.write(pack('I', filesize(args.recovery_dtbo)))   # size in bytes
+        if args.recovery_dtbo:
+            args.output.write(pack('Q', get_recovery_dtbo_offset(args))) # recovery dtbo offset
+        else:
+            args.output.write(pack('Q', 0)) # Will be set to 0 for devices without a recovery dtbo
+
+    # Populate boot image header size for header versions 1 and 2.
+    if args.header_version == 1:
+        args.output.write(pack('I', BOOT_IMAGE_HEADER_V1_SIZE))
+    elif args.header_version == 2:
+        args.output.write(pack('I', BOOT_IMAGE_HEADER_V2_SIZE))
+
+    if args.header_version > 1:
+        args.output.write(pack('I', filesize(args.dtb)))   # size in bytes
+        args.output.write(pack('Q', args.base + args.dtb_offset)) # dtb physical load address
+    pad_file(args.output, args.pagesize)
+    return img_id
+
+
+class ValidateStrLenAction(Action):
+    def __init__(self, option_strings, dest, nargs=None, **kwargs):
+        if 'maxlen' not in kwargs:
+            raise ValueError('maxlen must be set')
+        self.maxlen = int(kwargs['maxlen'])
+        del kwargs['maxlen']
+        super(ValidateStrLenAction, self).__init__(option_strings, dest, **kwargs)
+
+    def __call__(self, parser, namespace, values, option_string=None):
+        if len(values) > self.maxlen:
+            raise ValueError('String argument too long: max {0:d}, got {1:d}'.
+                format(self.maxlen, len(values)))
+        setattr(namespace, self.dest, values)
+
+
+def write_padded_file(f_out, f_in, padding):
+    if f_in is None:
+        return
+    f_out.write(f_in.read())
+    pad_file(f_out, padding)
+
+
+def parse_int(x):
+    return int(x, 0)
+
+def parse_os_version(x):
+    match = re.search(r'^(\d{1,3})(?:\.(\d{1,3})(?:\.(\d{1,3}))?)?', x)
+    if match:
+        a = int(match.group(1))
+        b = c = 0
+        if match.lastindex >= 2:
+            b = int(match.group(2))
+        if match.lastindex == 3:
+            c = int(match.group(3))
+        # 7 bits allocated for each field
+        assert a < 128
+        assert b < 128
+        assert c < 128
+        return (a << 14) | (b << 7) | c
+    return 0
+
+def parse_os_patch_level(x):
+    match = re.search(r'^(\d{4})-(\d{2})-(\d{2})', x)
+    if match:
+        y = int(match.group(1)) - 2000
+        m = int(match.group(2))
+        # 7 bits allocated for the year, 4 bits for the month
+        assert y >= 0 and y < 128
+        assert m > 0 and m <= 12
+        return (y << 4) | m
+    return 0
+
+def parse_cmdline():
+    parser = ArgumentParser()
+    parser.add_argument('--kernel', help='path to the kernel', type=FileType('rb'),
+                        required=True)
+    parser.add_argument('--ramdisk', help='path to the ramdisk', type=FileType('rb'))
+    parser.add_argument('--second', help='path to the 2nd bootloader', type=FileType('rb'))
+    parser.add_argument('--dtb', help='path to dtb', type=FileType('rb'))
+    recovery_dtbo_group = parser.add_mutually_exclusive_group()
+    recovery_dtbo_group.add_argument('--recovery_dtbo', help='path to the recovery DTBO', type=FileType('rb'))
+    recovery_dtbo_group.add_argument('--recovery_acpio', help='path to the recovery ACPIO',
+                                     type=FileType('rb'), metavar='RECOVERY_ACPIO', dest='recovery_dtbo')
+    parser.add_argument('--cmdline', help='extra arguments to be passed on the '
+                        'kernel command line', default='', action=ValidateStrLenAction, maxlen=1536)
+    parser.add_argument('--base', help='base address', type=parse_int, default=0x10000000)
+    parser.add_argument('--kernel_offset', help='kernel offset', type=parse_int, default=0x00008000)
+    parser.add_argument('--ramdisk_offset', help='ramdisk offset', type=parse_int, default=0x01000000)
+    parser.add_argument('--second_offset', help='2nd bootloader offset', type=parse_int,
+                        default=0x00f00000)
+    parser.add_argument('--dtb_offset', help='dtb offset', type=parse_int, default=0x01f00000)
+
+    parser.add_argument('--os_version', help='operating system version', type=parse_os_version,
+                        default=0)
+    parser.add_argument('--os_patch_level', help='operating system patch level',
+                        type=parse_os_patch_level, default=0)
+    parser.add_argument('--tags_offset', help='tags offset', type=parse_int, default=0x00000100)
+    parser.add_argument('--board', help='board name', default='', action=ValidateStrLenAction,
+                        maxlen=16)
+    parser.add_argument('--pagesize', help='page size', type=parse_int,
+                        choices=[2**i for i in range(11,15)], default=2048)
+    parser.add_argument('--id', help='print the image ID on standard output',
+                        action='store_true')
+    parser.add_argument('--header_version', help='boot image header version', type=parse_int, default=0)
+    parser.add_argument('-o', '--output', help='output file name', type=FileType('wb'),
+                        required=True)
+    return parser.parse_args()
+
+
+def write_data(args):
+    write_padded_file(args.output, args.kernel, args.pagesize)
+    write_padded_file(args.output, args.ramdisk, args.pagesize)
+    write_padded_file(args.output, args.second, args.pagesize)
+
+    if args.header_version > 0:
+        write_padded_file(args.output, args.recovery_dtbo, args.pagesize)
+    if args.header_version > 1:
+        write_padded_file(args.output, args.dtb, args.pagesize)
+
+def main():
+    args = parse_cmdline()
+    img_id = write_header(args)
+    write_data(args)
+    if args.id:
+        if isinstance(img_id, str):
+            # Python 2's struct.pack returns a string, but py3 returns bytes.
+            img_id = [ord(x) for x in img_id]
+        print('0x' + ''.join('{:02x}'.format(c) for c in img_id))
+
+if __name__ == '__main__':
+    main()
diff --git a/scripts/repack-bootimg b/scripts/repack-bootimg
new file mode 100755
index 0000000000..a4f0298c44
--- /dev/null
+++ b/scripts/repack-bootimg
@@ -0,0 +1,160 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2019 Fuzhou Rockchip Electronics Co., Ltd.
+set -e
+
+usage() {
+	cat >&2 << USAGE
+usage: $0 [-h] [-z] --boot_img BOOT_IMG [--out OUT] [--kernel KERNEL] [--ramdisk RAMDISK] [--second SECOND] [--dtb DTB ] [--recovery_dtbo RECOVERY_DTBO] -o OUTPUT
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -z                    pack compressed kernel image
+  --boot_img BOOT_IMG   path to the original boot image
+  --out OUT             path to out binaries (default: out)
+  --kernel KERNEL       path to the new kernel
+  --ramdisk RAMDISK     path to the new ramdisk
+  --second SECOND       path to the new 2nd bootloader (default: resource.img)
+  --dtb DTB             path to the new dtb
+  --recovery_dtbo RECOVERY_DTBO
+                        path to the new recovery DTBO
+  -o OUTPUT, --output OUTPUT
+                        output file name
+USAGE
+}
+
+# Parse command-line arguments
+while [ $# -gt 0 ]; do
+	case $1 in
+		--boot_img)
+			boot_img=$2
+			shift 2
+			;;
+		--out)
+			out=$2
+			shift 2
+			;;
+		--kernel)
+			kernel=$2
+			shift 2
+			;;
+		--ramdisk)
+			ramdisk=$2
+			shift 2
+			;;
+		--second)
+			second=$2
+			shift 2
+			;;
+		--dtb)
+			dtb=$2
+			shift 2
+			;;
+		--recovery_dtbo)
+			recovery_dtbo=$2
+			shift 2
+			;;
+		-h)
+			usage
+			exit 0
+			;;
+		--help)
+			usage
+			exit 0
+			;;
+		-z)
+			compressed_kernel=y
+			shift
+			;;
+		-o)
+			output=$2
+			shift 2
+			;;
+		--output)
+			output=$2
+			shift 2
+			;;
+		*)
+			shift
+			;;
+        esac
+done
+
+if [ "$boot_img" == "" -o ! -e "$boot_img" ]; then
+	echo "No boot img"
+	usage
+	exit 1
+fi
+
+if [ "$output" == "" ]; then
+	echo "No output file name"
+	usage
+	exit 1
+fi
+
+srctree=${srctree-"."}
+objtree=${objtree-"."}
+out=${out-"out"}
+if [ "$($srctree/scripts/config --state CONFIG_ARM64)" == "y" ]; then
+	if [ "$compressed_kernel" == "y" ]; then
+		default_kernel=arch/arm64/boot/Image.lz4
+	else
+		default_kernel=arch/arm64/boot/Image
+	fi
+else
+	if [ "$compressed_kernel" == "y" ]; then
+		default_kernel=arch/arm/boot/zImage
+	else
+		default_kernel=arch/arm/boot/Image
+	fi
+fi
+kernel=${kernel-$objtree/$default_kernel}
+second=${second-$objtree/resource.img}
+ramdisk=${ramdisk-$out/ramdisk}
+dtb=${dtb-$out/dtb}
+recovery_dtbo=${recovery_dtbo-$out/recovery_dtbo}
+log="$out/unpack.log"
+
+mkdir -p $out
+$srctree/scripts/unpack_bootimg --boot_img $boot_img --out $out > $log
+
+cmdline=$(grep -a "^command line args: " $log | tr '\0' '\n'| sed "s/^command line args: //")
+extra_cmdline=$(grep -a "^additional command line args: " $log | tr '\0' '\n'| sed "s/^additional command line args: //")
+version=$(grep -a "^boot image header version: " $log | sed "s/^boot image header version: //")
+
+os_version_patch_level=$(grep -a "^os version and patch level: " $log | sed "s/^os version and patch level: //")
+
+v=$(($os_version_patch_level >> 11))
+a=$(($v >> 14))
+b=$((($v >> 7) & 0x7f))
+c=$(($v & 0x7f))
+os_version=$(printf '%d.%d.%d' $a $b $c)
+
+v=$(($os_version_patch_level & 0x7ff))
+y=$((($v >> 4) + 2000))
+m=$((($v & 15)))
+os_patch_level=$(printf '%d-%02d-01' $y $m)
+
+dtb_size=$(grep -a "^dtb size: " $log | sed "s/^dtb size: //")
+dtb_size=${dtb_size:-0}
+if [ $dtb_size -gt 0 -a -e "$dtb" ]; then
+	DTB="--dtb $dtb"
+fi
+
+recovery_dtbo_size=$(grep -a "^recovery dtbo size: " $log | sed "s/^recovery dtbo size: //")
+recovery_dtbo_size=${recovery_dtbo_size:-0}
+if [ $recovery_dtbo_size -gt 0 -a -e "$recovery_dtbo" ]; then
+	RECOVERY_DTBO="--recovery_dtbo $recovery_dtbo"
+fi
+
+$srctree/scripts/mkbootimg \
+--kernel $kernel \
+--second $second \
+--ramdisk $ramdisk \
+$DTB \
+$RECOVERY_DTBO \
+--cmdline "${cmdline}${extra_cmdline}" \
+--header_version $version \
+--os_version $os_version \
+--os_patch_level $os_patch_level \
+--output $output
diff --git a/scripts/unpack_bootimg b/scripts/unpack_bootimg
new file mode 100755
index 0000000000..789bf5e6d9
--- /dev/null
+++ b/scripts/unpack_bootimg
@@ -0,0 +1,152 @@
+#!/usr/bin/env python
+# Copyright 2018, The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""unpacks the bootimage.
+
+Extracts the kernel, ramdisk, second bootloader, dtb and recovery dtbo images.
+"""
+
+from __future__ import print_function
+from argparse import ArgumentParser, FileType
+from struct import unpack
+import os
+
+
+def create_out_dir(dir_path):
+    """creates a directory 'dir_path' if it does not exist"""
+    if not os.path.exists(dir_path):
+        os.makedirs(dir_path)
+
+
+def extract_image(offset, size, bootimage, extracted_image_name):
+    """extracts an image from the bootimage"""
+    bootimage.seek(offset)
+    with open(extracted_image_name, 'wb') as file_out:
+        file_out.write(bootimage.read(size))
+
+
+def get_number_of_pages(image_size, page_size):
+    """calculates the number of pages required for the image"""
+    return (image_size + page_size - 1) / page_size
+
+
+def unpack_bootimage(args):
+    """extracts kernel, ramdisk, second bootloader and recovery dtbo"""
+    boot_magic = unpack('8s', args.boot_img.read(8))
+    print('boot_magic: %s' % boot_magic)
+    kernel_ramdisk_second_info = unpack('10I', args.boot_img.read(10 * 4))
+    print('kernel_size: %s' % kernel_ramdisk_second_info[0])
+    print('kernel load address: %#x' % kernel_ramdisk_second_info[1])
+    print('ramdisk size: %s' % kernel_ramdisk_second_info[2])
+    print('ramdisk load address: %#x' % kernel_ramdisk_second_info[3])
+    print('second bootloader size: %s' % kernel_ramdisk_second_info[4])
+    print('second bootloader load address: %#x' % kernel_ramdisk_second_info[5])
+    print('kernel tags load address: %#x' % kernel_ramdisk_second_info[6])
+    print('page size: %s' % kernel_ramdisk_second_info[7])
+    print('boot image header version: %s' % kernel_ramdisk_second_info[8])
+    print('os version and patch level: %s' % kernel_ramdisk_second_info[9])
+
+    product_name = unpack('16s', args.boot_img.read(16))
+    print('product name: %s' % product_name)
+    cmdline = unpack('512s', args.boot_img.read(512))
+    print('command line args: %s' % cmdline)
+
+    args.boot_img.read(32)  # ignore SHA
+
+    extra_cmdline = unpack('1024s', args.boot_img.read(1024))
+    print('additional command line args: %s' % extra_cmdline)
+
+    kernel_size = kernel_ramdisk_second_info[0]
+    ramdisk_size = kernel_ramdisk_second_info[2]
+    second_size = kernel_ramdisk_second_info[4]
+    page_size = kernel_ramdisk_second_info[7]
+    version = kernel_ramdisk_second_info[8]
+    if version > 0:
+        recovery_dtbo_size = unpack('I', args.boot_img.read(1 * 4))[0]
+        print('recovery dtbo size: %s' % recovery_dtbo_size)
+        recovery_dtbo_offset = unpack('Q', args.boot_img.read(8))[0]
+        print('recovery dtbo offset: %#x' % recovery_dtbo_offset)
+        boot_header_size = unpack('I', args.boot_img.read(4))[0]
+        print('boot header size: %s' % boot_header_size)
+    else:
+        recovery_dtbo_size = 0
+    if version > 1:
+        dtb_size = unpack('I', args.boot_img.read(4))[0]
+        print('dtb size: %s' % dtb_size)
+        dtb_load_address = unpack('Q', args.boot_img.read(8))[0]
+        print('dtb address: %#x' % dtb_load_address)
+    else:
+        dtb_size = 0
+
+
+    # The first page contains the boot header
+    num_header_pages = 1
+
+    num_kernel_pages = get_number_of_pages(kernel_size, page_size)
+    kernel_offset = page_size * num_header_pages  # header occupies a page
+    image_info_list = [(kernel_offset, kernel_size, 'kernel')]
+
+    num_ramdisk_pages = get_number_of_pages(ramdisk_size, page_size)
+    ramdisk_offset = page_size * (num_header_pages + num_kernel_pages
+                                 ) # header + kernel
+    image_info_list.append((ramdisk_offset, ramdisk_size, 'ramdisk'))
+
+    if second_size > 0:
+        second_offset = page_size * (
+                num_header_pages + num_kernel_pages + num_ramdisk_pages
+                )  # header + kernel + ramdisk
+        image_info_list.append((second_offset, second_size, 'second'))
+
+    if recovery_dtbo_size > 0:
+        image_info_list.append((recovery_dtbo_offset, recovery_dtbo_size,
+                                'recovery_dtbo'))
+    if dtb_size > 0:
+        num_second_pages = get_number_of_pages(second_size, page_size)
+        num_recovery_dtbo_pages = get_number_of_pages(recovery_dtbo_size, page_size)
+        dtb_offset = page_size * (
+            num_header_pages + num_kernel_pages + num_ramdisk_pages + num_second_pages +
+            num_recovery_dtbo_pages
+        )
+
+        image_info_list.append((dtb_offset, dtb_size, 'dtb'))
+
+    for image_info in image_info_list:
+        extract_image(image_info[0], image_info[1], args.boot_img,
+                      os.path.join(args.out, image_info[2]))
+
+
+def parse_cmdline():
+    """parse command line arguments"""
+    parser = ArgumentParser(
+        description='Unpacks boot.img/recovery.img, extracts the kernel,'
+        'ramdisk, second bootloader, recovery dtbo and dtb')
+    parser.add_argument(
+        '--boot_img',
+        help='path to boot image',
+        type=FileType('rb'),
+        required=True)
+    parser.add_argument('--out', help='path to out binaries', default='out')
+    return parser.parse_args()
+
+
+def main():
+    """parse arguments and unpack boot image"""
+    args = parse_cmdline()
+    create_out_dir(args.out)
+    unpack_bootimage(args)
+
+
+if __name__ == '__main__':
+    main()