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artiq/artiq/frontend/bit2bin.py

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2.3 KiB
Python
Executable File

#!/usr/bin/env python3
# Copyright 2014-2017 Robert Jordens <jordens@gmail.com>
# after
# https://github.com/mfischer/fpgadev-zynq/blob/master/top/python/bit_to_zynq_bin.py
import struct
def flip32(data):
sl = struct.Struct("<I")
sb = struct.Struct(">I")
b = memoryview(data)
d = bytearray(len(data))
for offset in range(0, len(data), sl.size):
sb.pack_into(d, offset, *sl.unpack_from(b, offset))
return d
def bit2bin(bit, bin, flip=False):
l, = struct.unpack(">H", bit.read(2))
if l != 9:
raise ValueError("Missing <0009> header, not a bit file")
_ = bit.read(l) # unknown data
l, = struct.unpack(">H", bit.read(2))
if l != 1:
raise ValueError("Missing <0001> header, not a bit file")
while True:
key = bit.read(1).decode()
if not key:
break
if key in "abcd":
d = bit.read(*struct.unpack(">H", bit.read(2)))
assert d.endswith(b"\x00")
d = d[:-1].decode()
name = {
"a": "Design",
"b": "Part name",
"c": "Date",
"d": "Time"
}[key]
print("{}: {}".format(name, d))
elif key == "e":
l, = struct.unpack(">I", bit.read(4))
print("Bitstream payload length: {:#x}".format(l))
d = bit.read(l)
if flip:
d = flip32(d)
bin.write(d)
else:
d = bit.read(*struct.unpack(">H", bit.read(2)))
print("Unexpected key: {}: {}".format(key, d))
if __name__ == "__main__":
import argparse
parser = argparse.ArgumentParser(
description="Convert FPGA bit files to raw bin format "
"suitable for flashing")
parser.add_argument("-f", "--flip", dest="flip", action="store_true",
default=False, help="Flip 32-bit endianess (needed for Zynq)")
parser.add_argument("bitfile", metavar="BITFILE",
help="Input bit file name")
parser.add_argument("binfile", metavar="BINFILE",
help="Output bin file name")
args = parser.parse_args()
with open(args.bitfile, "rb") as f, open(args.binfile, "wb") as g:
bit2bin(f, g, args.flip)