sil3112_deblock_ndrv.py

#!/usr/bin/env python3
# SPDX-License-Identifier: MIT

# This script will extract the PEF NDRV from 1S2_512.ROM
# as posted here:
# https://68kmla.org/bb/index.php?threads/silicon-image-sil3112-flashing-easier-way-using-flashrom.7013/

a = []
d = b""
with open("1S2_512.ROM", "rb") as f:
	f.seek(0x2922)
	while True:
		cmd = int.from_bytes(f.read(1), byteorder="little")
		if cmd == 0x12: # delimit ""
			d = f.read(int.from_bytes(f.read(1), byteorder="little"))
		elif cmd == 0x01:
			cmd2 = int.from_bytes(f.read(1), byteorder="little")
			if cmd2 == 0x15: # encode-bytes
				a.append(d)
			elif cmd2 == 0x12: # encode+
				pass
			elif cmd2 == 0x10: # property
				break
			else:
				raise Exception("?")
		elif cmd == 0x15: # ???
			pass
		else:
			raise Exception("?")

with open("out.ndrv", "wb") as f:
	f.write(b"".join(a))