da-dump.py: Tool to dump info about download agent combined binary.

#!/usr/bin/env python3

#

# This utility dumps information about supported chips from combined

# download agent (DA) binary. Typical name of such bianry is

# MTK_AllInOne_DA.bin, so other exist too.

#

import sys

import struct

def decode(f, sz, fmt):

    s = f.read(sz)

    return struct.unpack("<" + fmt, s)

f = open(sys.argv[1], "rb")

sig = f.read(0x20)

assert sig.startswith(b"MTK_DOWNLOAD_AGENT")

da_id = f.read(0x40)

da_id = da_id.rstrip(b"\0")

print("# Mediatek Download Agent information dump")

print("id: %s" % str(da_id, "ascii"))

assert decode(f, 4, "I")[0] == 4

assert f.read(4) == b"\x99\x88\x66\x22"

num_socs = decode(f, 4, "I")[0]

print("num_chips:", num_socs)

PARTS = [

    (5, 6),

    (9, 10),

    (14, 15),

]

for i in range(num_socs):

    rec = f.read(0xdc)

    fields = struct.unpack("<2sHIIIIIIIQIIIIIIIIII140s", rec)

    assert fields[0] == b'\xda\xda'

    assert fields[-1] == b"\0" * 140

    fields = fields[1:-1]

    flds = ["0x%08x" % x if isinstance(x, int) else x for x in fields]

    print("- chip_id: %#x" % fields[0])

#    print("  all_fields:", flds)

    assert fields[10] == fields[12] + fields[13]

    print("  da_part1_addr: 0x%08x" % fields[11])

    for i, (off, sz) in enumerate(PARTS):

        print("  da_part%d: [%#x, 0x%05x]  # %#x-%#x" % (i, fields[off], fields[sz], fields[off], fields[off] + fields[sz]))