esp-idf/components/partition_table/gen_esp32part.py
Mahavir Jain 51a61fb41c
gen_esp32part: allow secure boot v2 based app partition size 4K aligned
For Secure Boot v2 case, unsigned image is first padded to next 64K
aligned boundary and then a signature block of 4K gets appended. Thus
an app partition whose size is 4K aligned should be allowed here.

For Secure Boot v1 case, app partition size must be 64K aligned as the
signature block lies at the very end of 64K boundary.

Relevant:
57b601ab7f
2023-02-12 18:58:21 +05:30

597 lines
22 KiB
Python
Executable File

#!/usr/bin/env python
#
# ESP32 partition table generation tool
#
# Converts partition tables to/from CSV and binary formats.
#
# See https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/partition-tables.html
# for explanation of partition table structure and uses.
#
# SPDX-FileCopyrightText: 2016-2021 Espressif Systems (Shanghai) CO LTD
# SPDX-License-Identifier: Apache-2.0
from __future__ import division, print_function, unicode_literals
import argparse
import binascii
import errno
import hashlib
import os
import re
import struct
import sys
MAX_PARTITION_LENGTH = 0xC00 # 3K for partition data (96 entries) leaves 1K in a 4K sector for signature
MD5_PARTITION_BEGIN = b'\xEB\xEB' + b'\xFF' * 14 # The first 2 bytes are like magic numbers for MD5 sum
PARTITION_TABLE_SIZE = 0x1000 # Size of partition table
MIN_PARTITION_SUBTYPE_APP_OTA = 0x10
NUM_PARTITION_SUBTYPE_APP_OTA = 16
SECURE_NONE = None
SECURE_V1 = 'v1'
SECURE_V2 = 'v2'
__version__ = '1.2'
APP_TYPE = 0x00
DATA_TYPE = 0x01
TYPES = {
'app': APP_TYPE,
'data': DATA_TYPE,
}
def get_ptype_as_int(ptype):
""" Convert a string which might be numeric or the name of a partition type to an integer """
try:
return TYPES[ptype]
except KeyError:
try:
return int(ptype, 0)
except TypeError:
return ptype
# Keep this map in sync with esp_partition_subtype_t enum in esp_partition.h
SUBTYPES = {
APP_TYPE: {
'factory': 0x00,
'test': 0x20,
},
DATA_TYPE: {
'ota': 0x00,
'phy': 0x01,
'nvs': 0x02,
'coredump': 0x03,
'nvs_keys': 0x04,
'efuse': 0x05,
'undefined': 0x06,
'esphttpd': 0x80,
'fat': 0x81,
'spiffs': 0x82,
},
}
def get_subtype_as_int(ptype, subtype):
""" Convert a string which might be numeric or the name of a partition subtype to an integer """
try:
return SUBTYPES[get_ptype_as_int(ptype)][subtype]
except KeyError:
try:
return int(subtype, 0)
except TypeError:
return subtype
ALIGNMENT = {
APP_TYPE: 0x10000,
DATA_TYPE: 0x4,
}
STRICT_DATA_ALIGNMENT = 0x1000
def get_alignment_offset_for_type(ptype):
return ALIGNMENT.get(ptype, ALIGNMENT[DATA_TYPE])
def get_alignment_size_for_type(ptype):
if ptype == APP_TYPE and secure == SECURE_V1:
# For secure boot v1 case, app partition must be 64K aligned
# signature block (68 bytes) lies at the very end of 64K block
return 0x10000
if ptype == APP_TYPE and secure == SECURE_V2:
# For secure boot v2 case, app partition must be 4K aligned
# signature block (4K) is kept after padding the unsigned image to 64K boundary
return 0x1000
# No specific size alignement requirement as such
return 0x1
quiet = False
md5sum = True
secure = SECURE_NONE
offset_part_table = 0
def status(msg):
""" Print status message to stderr """
if not quiet:
critical(msg)
def critical(msg):
""" Print critical message to stderr """
sys.stderr.write(msg)
sys.stderr.write('\n')
class PartitionTable(list):
def __init__(self):
super(PartitionTable, self).__init__(self)
@classmethod
def from_file(cls, f):
data = f.read()
data_is_binary = data[0:2] == PartitionDefinition.MAGIC_BYTES
if data_is_binary:
status('Parsing binary partition input...')
return cls.from_binary(data), True
data = data.decode()
status('Parsing CSV input...')
return cls.from_csv(data), False
@classmethod
def from_csv(cls, csv_contents):
res = PartitionTable()
lines = csv_contents.splitlines()
def expand_vars(f):
f = os.path.expandvars(f)
m = re.match(r'(?<!\\)\$([A-Za-z_][A-Za-z0-9_]*)', f)
if m:
raise InputError("unknown variable '%s'" % m.group(1))
return f
for line_no in range(len(lines)):
line = expand_vars(lines[line_no]).strip()
if line.startswith('#') or len(line) == 0:
continue
try:
res.append(PartitionDefinition.from_csv(line, line_no + 1))
except InputError as err:
raise InputError('Error at line %d: %s' % (line_no + 1, err))
except Exception:
critical('Unexpected error parsing CSV line %d: %s' % (line_no + 1, line))
raise
# fix up missing offsets & negative sizes
last_end = offset_part_table + PARTITION_TABLE_SIZE # first offset after partition table
for e in res:
if e.offset is not None and e.offset < last_end:
if e == res[0]:
raise InputError('CSV Error: First partition offset 0x%x overlaps end of partition table 0x%x'
% (e.offset, last_end))
else:
raise InputError('CSV Error: Partitions overlap. Partition at line %d sets offset 0x%x. Previous partition ends 0x%x'
% (e.line_no, e.offset, last_end))
if e.offset is None:
pad_to = get_alignment_offset_for_type(e.type)
if last_end % pad_to != 0:
last_end += pad_to - (last_end % pad_to)
e.offset = last_end
if e.size < 0:
e.size = -e.size - e.offset
last_end = e.offset + e.size
return res
def __getitem__(self, item):
""" Allow partition table access via name as well as by
numeric index. """
if isinstance(item, str):
for x in self:
if x.name == item:
return x
raise ValueError("No partition entry named '%s'" % item)
else:
return super(PartitionTable, self).__getitem__(item)
def find_by_type(self, ptype, subtype):
""" Return a partition by type & subtype, returns
None if not found """
# convert ptype & subtypes names (if supplied this way) to integer values
ptype = get_ptype_as_int(ptype)
subtype = get_subtype_as_int(ptype, subtype)
for p in self:
if p.type == ptype and p.subtype == subtype:
yield p
return
def find_by_name(self, name):
for p in self:
if p.name == name:
return p
return None
def verify(self):
# verify each partition individually
for p in self:
p.verify()
# check on duplicate name
names = [p.name for p in self]
duplicates = set(n for n in names if names.count(n) > 1)
# print sorted duplicate partitions by name
if len(duplicates) != 0:
critical('A list of partitions that have the same name:')
for p in sorted(self, key=lambda x:x.name):
if len(duplicates.intersection([p.name])) != 0:
critical('%s' % (p.to_csv()))
raise InputError('Partition names must be unique')
# check for overlaps
last = None
for p in sorted(self, key=lambda x:x.offset):
if p.offset < offset_part_table + PARTITION_TABLE_SIZE:
raise InputError('Partition offset 0x%x is below 0x%x' % (p.offset, offset_part_table + PARTITION_TABLE_SIZE))
if last is not None and p.offset < last.offset + last.size:
raise InputError('Partition at 0x%x overlaps 0x%x-0x%x' % (p.offset, last.offset, last.offset + last.size - 1))
last = p
# check that otadata should be unique
otadata_duplicates = [p for p in self if p.type == TYPES['data'] and p.subtype == SUBTYPES[DATA_TYPE]['ota']]
if len(otadata_duplicates) > 1:
for p in otadata_duplicates:
critical('%s' % (p.to_csv()))
raise InputError('Found multiple otadata partitions. Only one partition can be defined with type="data"(1) and subtype="ota"(0).')
if len(otadata_duplicates) == 1 and otadata_duplicates[0].size != 0x2000:
p = otadata_duplicates[0]
critical('%s' % (p.to_csv()))
raise InputError('otadata partition must have size = 0x2000')
def flash_size(self):
""" Return the size that partitions will occupy in flash
(ie the offset the last partition ends at)
"""
try:
last = sorted(self, reverse=True)[0]
except IndexError:
return 0 # empty table!
return last.offset + last.size
def verify_size_fits(self, flash_size_bytes: int) -> None:
""" Check that partition table fits into the given flash size.
Raises InputError otherwise.
"""
table_size = self.flash_size()
if flash_size_bytes < table_size:
mb = 1024 * 1024
raise InputError('Partitions tables occupies %.1fMB of flash (%d bytes) which does not fit in configured '
"flash size %dMB. Change the flash size in menuconfig under the 'Serial Flasher Config' menu." %
(table_size / mb, table_size, flash_size_bytes / mb))
@classmethod
def from_binary(cls, b):
md5 = hashlib.md5()
result = cls()
for o in range(0,len(b),32):
data = b[o:o + 32]
if len(data) != 32:
raise InputError('Partition table length must be a multiple of 32 bytes')
if data == b'\xFF' * 32:
return result # got end marker
if md5sum and data[:2] == MD5_PARTITION_BEGIN[:2]: # check only the magic number part
if data[16:] == md5.digest():
continue # the next iteration will check for the end marker
else:
raise InputError("MD5 checksums don't match! (computed: 0x%s, parsed: 0x%s)" % (md5.hexdigest(), binascii.hexlify(data[16:])))
else:
md5.update(data)
result.append(PartitionDefinition.from_binary(data))
raise InputError('Partition table is missing an end-of-table marker')
def to_binary(self):
result = b''.join(e.to_binary() for e in self)
if md5sum:
result += MD5_PARTITION_BEGIN + hashlib.md5(result).digest()
if len(result) >= MAX_PARTITION_LENGTH:
raise InputError('Binary partition table length (%d) longer than max' % len(result))
result += b'\xFF' * (MAX_PARTITION_LENGTH - len(result)) # pad the sector, for signing
return result
def to_csv(self, simple_formatting=False):
rows = ['# ESP-IDF Partition Table',
'# Name, Type, SubType, Offset, Size, Flags']
rows += [x.to_csv(simple_formatting) for x in self]
return '\n'.join(rows) + '\n'
class PartitionDefinition(object):
MAGIC_BYTES = b'\xAA\x50'
# dictionary maps flag name (as used in CSV flags list, property name)
# to bit set in flags words in binary format
FLAGS = {
'encrypted': 0
}
# add subtypes for the 16 OTA slot values ("ota_XX, etc.")
for ota_slot in range(NUM_PARTITION_SUBTYPE_APP_OTA):
SUBTYPES[TYPES['app']]['ota_%d' % ota_slot] = MIN_PARTITION_SUBTYPE_APP_OTA + ota_slot
def __init__(self):
self.name = ''
self.type = None
self.subtype = None
self.offset = None
self.size = None
self.encrypted = False
@classmethod
def from_csv(cls, line, line_no):
""" Parse a line from the CSV """
line_w_defaults = line + ',,,,' # lazy way to support default fields
fields = [f.strip() for f in line_w_defaults.split(',')]
res = PartitionDefinition()
res.line_no = line_no
res.name = fields[0]
res.type = res.parse_type(fields[1])
res.subtype = res.parse_subtype(fields[2])
res.offset = res.parse_address(fields[3])
res.size = res.parse_address(fields[4])
if res.size is None:
raise InputError("Size field can't be empty")
flags = fields[5].split(':')
for flag in flags:
if flag in cls.FLAGS:
setattr(res, flag, True)
elif len(flag) > 0:
raise InputError("CSV flag column contains unknown flag '%s'" % (flag))
return res
def __eq__(self, other):
return self.name == other.name and self.type == other.type \
and self.subtype == other.subtype and self.offset == other.offset \
and self.size == other.size
def __repr__(self):
def maybe_hex(x):
return '0x%x' % x if x is not None else 'None'
return "PartitionDefinition('%s', 0x%x, 0x%x, %s, %s)" % (self.name, self.type, self.subtype or 0,
maybe_hex(self.offset), maybe_hex(self.size))
def __str__(self):
return "Part '%s' %d/%d @ 0x%x size 0x%x" % (self.name, self.type, self.subtype, self.offset or -1, self.size or -1)
def __cmp__(self, other):
return self.offset - other.offset
def __lt__(self, other):
return self.offset < other.offset
def __gt__(self, other):
return self.offset > other.offset
def __le__(self, other):
return self.offset <= other.offset
def __ge__(self, other):
return self.offset >= other.offset
def parse_type(self, strval):
if strval == '':
raise InputError("Field 'type' can't be left empty.")
return parse_int(strval, TYPES)
def parse_subtype(self, strval):
if strval == '':
if self.type == TYPES['app']:
raise InputError('App partition cannot have an empty subtype')
return SUBTYPES[DATA_TYPE]['undefined']
return parse_int(strval, SUBTYPES.get(self.type, {}))
def parse_address(self, strval):
if strval == '':
return None # PartitionTable will fill in default
return parse_int(strval)
def verify(self):
if self.type is None:
raise ValidationError(self, 'Type field is not set')
if self.subtype is None:
raise ValidationError(self, 'Subtype field is not set')
if self.offset is None:
raise ValidationError(self, 'Offset field is not set')
if self.size is None:
raise ValidationError(self, 'Size field is not set')
offset_align = get_alignment_offset_for_type(self.type)
if self.offset % offset_align:
raise ValidationError(self, 'Offset 0x%x is not aligned to 0x%x' % (self.offset, offset_align))
# The alignment requirement for non-app partition is 4 bytes, but it should be 4 kB.
# Print a warning for now, make it an error in IDF 5.0 (IDF-3742).
if self.type != APP_TYPE and self.offset % STRICT_DATA_ALIGNMENT:
critical('WARNING: Partition %s not aligned to 0x%x.'
'This is deprecated and will be considered an error in the future release.' % (self.name, STRICT_DATA_ALIGNMENT))
if self.type == APP_TYPE and secure is not SECURE_NONE:
size_align = get_alignment_size_for_type(self.type)
if self.size % size_align:
raise ValidationError(self, 'Size 0x%x is not aligned to 0x%x' % (self.size, size_align))
if self.name in TYPES and TYPES.get(self.name, '') != self.type:
critical("WARNING: Partition has name '%s' which is a partition type, but does not match this partition's "
'type (0x%x). Mistake in partition table?' % (self.name, self.type))
all_subtype_names = []
for names in (t.keys() for t in SUBTYPES.values()):
all_subtype_names += names
if self.name in all_subtype_names and SUBTYPES.get(self.type, {}).get(self.name, '') != self.subtype:
critical("WARNING: Partition has name '%s' which is a partition subtype, but this partition has "
'non-matching type 0x%x and subtype 0x%x. Mistake in partition table?' % (self.name, self.type, self.subtype))
STRUCT_FORMAT = b'<2sBBLL16sL'
@classmethod
def from_binary(cls, b):
if len(b) != 32:
raise InputError('Partition definition length must be exactly 32 bytes. Got %d bytes.' % len(b))
res = cls()
(magic, res.type, res.subtype, res.offset,
res.size, res.name, flags) = struct.unpack(cls.STRUCT_FORMAT, b)
if b'\x00' in res.name: # strip null byte padding from name string
res.name = res.name[:res.name.index(b'\x00')]
res.name = res.name.decode()
if magic != cls.MAGIC_BYTES:
raise InputError('Invalid magic bytes (%r) for partition definition' % magic)
for flag,bit in cls.FLAGS.items():
if flags & (1 << bit):
setattr(res, flag, True)
flags &= ~(1 << bit)
if flags != 0:
critical('WARNING: Partition definition had unknown flag(s) 0x%08x. Newer binary format?' % flags)
return res
def get_flags_list(self):
return [flag for flag in self.FLAGS.keys() if getattr(self, flag)]
def to_binary(self):
flags = sum((1 << self.FLAGS[flag]) for flag in self.get_flags_list())
return struct.pack(self.STRUCT_FORMAT,
self.MAGIC_BYTES,
self.type, self.subtype,
self.offset, self.size,
self.name.encode(),
flags)
def to_csv(self, simple_formatting=False):
def addr_format(a, include_sizes):
if not simple_formatting and include_sizes:
for (val, suffix) in [(0x100000, 'M'), (0x400, 'K')]:
if a % val == 0:
return '%d%s' % (a // val, suffix)
return '0x%x' % a
def lookup_keyword(t, keywords):
for k,v in keywords.items():
if simple_formatting is False and t == v:
return k
return '%d' % t
def generate_text_flags():
""" colon-delimited list of flags """
return ':'.join(self.get_flags_list())
return ','.join([self.name,
lookup_keyword(self.type, TYPES),
lookup_keyword(self.subtype, SUBTYPES.get(self.type, {})),
addr_format(self.offset, False),
addr_format(self.size, True),
generate_text_flags()])
def parse_int(v, keywords={}):
"""Generic parser for integer fields - int(x,0) with provision for
k/m/K/M suffixes and 'keyword' value lookup.
"""
try:
for letter, multiplier in [('k', 1024), ('m', 1024 * 1024)]:
if v.lower().endswith(letter):
return parse_int(v[:-1], keywords) * multiplier
return int(v, 0)
except ValueError:
if len(keywords) == 0:
raise InputError('Invalid field value %s' % v)
try:
return keywords[v.lower()]
except KeyError:
raise InputError("Value '%s' is not valid. Known keywords: %s" % (v, ', '.join(keywords)))
def main():
global quiet
global md5sum
global offset_part_table
global secure
parser = argparse.ArgumentParser(description='ESP32 partition table utility')
parser.add_argument('--flash-size', help='Optional flash size limit, checks partition table fits in flash',
nargs='?', choices=['1MB', '2MB', '4MB', '8MB', '16MB', '32MB', '64MB', '128MB'])
parser.add_argument('--disable-md5sum', help='Disable md5 checksum for the partition table', default=False, action='store_true')
parser.add_argument('--no-verify', help="Don't verify partition table fields", action='store_true')
parser.add_argument('--verify', '-v', help='Verify partition table fields (deprecated, this behaviour is '
'enabled by default and this flag does nothing.', action='store_true')
parser.add_argument('--quiet', '-q', help="Don't print non-critical status messages to stderr", action='store_true')
parser.add_argument('--offset', '-o', help='Set offset partition table', default='0x8000')
parser.add_argument('--secure', help='Require app partitions to be suitable for secure boot', nargs='?', const=SECURE_V1, choices=[SECURE_V1, SECURE_V2])
parser.add_argument('input', help='Path to CSV or binary file to parse.', type=argparse.FileType('rb'))
parser.add_argument('output', help='Path to output converted binary or CSV file. Will use stdout if omitted.',
nargs='?', default='-')
args = parser.parse_args()
quiet = args.quiet
md5sum = not args.disable_md5sum
secure = args.secure
offset_part_table = int(args.offset, 0)
table, input_is_binary = PartitionTable.from_file(args.input)
if not args.no_verify:
status('Verifying table...')
table.verify()
if args.flash_size:
size_mb = int(args.flash_size.replace('MB', ''))
table.verify_size_fits(size_mb * 1024 * 1024)
# Make sure that the output directory is created
output_dir = os.path.abspath(os.path.dirname(args.output))
if not os.path.exists(output_dir):
try:
os.makedirs(output_dir)
except OSError as exc:
if exc.errno != errno.EEXIST:
raise
if input_is_binary:
output = table.to_csv()
with sys.stdout if args.output == '-' else open(args.output, 'w') as f:
f.write(output)
else:
output = table.to_binary()
try:
stdout_binary = sys.stdout.buffer # Python 3
except AttributeError:
stdout_binary = sys.stdout
with stdout_binary if args.output == '-' else open(args.output, 'wb') as f:
f.write(output)
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)