partition_table: Expanding the space under the bootloader

Allows you to move the partition table, it gives more space for the bootloader.
Added a new utility - parttool.py. This utility can search for the offset and/or size of the partitions by name and type/subtype. Use for getting APP_OFFSET and PHY_DATA_OFFSET.
The linker(esp32.bootloader.ld) made changes that allow you to write a custom bootloader code more.

TW14125

components/partition_table/parttool.py

@@ -0,0 +1,121 @@
+#!/usr/bin/env python
+#
+# parttool returns info about the required partition.
+#
+# This utility is used by the make system to get information 
+# about the start addresses: partition table, factory area, phy area.
+#
+# Copyright 2018 Espressif Systems (Shanghai) PTE LTD
+#
+# 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, division
+import argparse
+import os
+import re
+import struct
+import sys
+import hashlib
+import binascii
+import gen_esp32part as gen
+
+__version__ = '1.0'
+
+quiet = False
+
+def status(msg):
+    """ Print status message to stderr """
+    if not quiet:
+        critical(msg)
+
+def critical(msg):
+    """ Print critical message to stderr """
+    if not quiet:
+        sys.stderr.write(msg)
+        sys.stderr.write('\n')
+               
+def main():
+    global quiet
+    parser = argparse.ArgumentParser(description='Returns info about the required partition.')
+
+    parser.add_argument('--quiet', '-q', help="Don't print status messages to stderr", action='store_true')
+    parser.add_argument('--partition-name', '-p', help='The name of the required partition', type=str, default=None)
+    parser.add_argument('--type', '-t', help='The type of the required partition', type=str, default=None)
+    parser.add_argument('--subtype', '-s', help='The subtype of the required partition', type=str, default=None)
+    
+    parser.add_argument('--offset', '-o', help='Return offset of required partition', action="store_true", default=None)
+    parser.add_argument('--size', help='Return size of required partition', action="store_true", default=None)
+    
+    parser.add_argument('input', help='Path to CSV or binary file to parse. Will use stdin if omitted.', type=argparse.FileType('rb'), default=sys.stdin)
+
+    args = parser.parse_args()
+
+    quiet = args.quiet
+
+    input = args.input.read()
+    input_is_binary = input[0:2] == gen.PartitionDefinition.MAGIC_BYTES
+    if input_is_binary:
+        status("Parsing binary partition input...")
+        table = gen.PartitionTable.from_binary(input)
+    else:
+        input = input.decode()
+        status("Parsing CSV input...")
+        table = gen.PartitionTable.from_csv(input)
+
+    if args.partition_name is not None:
+        offset = 0
+        size = 0
+        for p in table:
+            if p.name == args.partition_name:
+                offset = p.offset
+                size = p.size
+                break;
+        if args.offset is not None:
+            print('0x%x ' % (offset))
+        if args.size is not None:
+            print('0x%x' % (size))
+        return 0
+    
+    if args.type is not None and args.subtype is not None:
+        offset = 0
+        size = 0
+        TYPES = gen.PartitionDefinition.TYPES
+        SUBTYPES = gen.PartitionDefinition.SUBTYPES
+        for p in table:
+            if p.type == TYPES[args.type]:
+                if p.subtype == SUBTYPES[TYPES[args.type]][args.subtype]:
+                    offset = p.offset
+                    size = p.size
+                    break;
+        if args.offset is not None:
+            print('0x%x ' % (offset))
+        if args.size is not None:
+            print('0x%x' % (size))
+        return 0
+
+class InputError(RuntimeError):
+    def __init__(self, e):
+        super(InputError, self).__init__(e)
+
+
+class ValidationError(InputError):
+    def __init__(self, partition, message):
+        super(ValidationError, self).__init__(
+            "Partition %s invalid: %s" % (partition.name, message))
+
+
+if __name__ == '__main__':
+    try:
+        main()
+    except InputError as e:
+        print(e, file=sys.stderr)
+        sys.exit(2)