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#!/usr/bin/python
import sys
import os
import struct
def flip32(data):
sl = struct.Struct('<I')
sb = struct.Struct('>I')
b = buffer(data)
d = bytearray(len(data))
for offset in xrange(0, len(data), 4):
sb.pack_into(d, offset, sl.unpack_from(b, offset)[0])
return d
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", help="Input bit file name")
parser.add_argument("binfile", help="Output bin file name")
args = parser.parse_args()
short = struct.Struct('>H')
ulong = struct.Struct('>I')
bitfile = open(args.bitfile, 'rb')
l = short.unpack(bitfile.read(2))[0]
if l != 9:
raise Exception, "Missing <0009> header (0x%x), not a bit file" % l
bitfile.read(l)
l = short.unpack(bitfile.read(2))[0]
d = bitfile.read(l)
if d != 'a':
raise Exception, "Missing <a> header, not a bit file"
l = short.unpack(bitfile.read(2))[0]
d = bitfile.read(l)
print "Design name:", d
KEYNAMES = {'b': "Partname", 'c': "Date", 'd': "Time"}
while 1:
k = bitfile.read(1)
if not k:
raise Exception, "unexpected EOF"
elif k == 'e':
l = ulong.unpack(bitfile.read(4))[0]
print "found binary data:", l
d = bitfile.read(l)
if args.flip:
d = flip32(d)
open(args.binfile, 'wb').write(d)
break
elif k in KEYNAMES:
l = short.unpack(bitfile.read(2))[0]
d = bitfile.read(l)
print KEYNAMES[k], d
else:
print "Unexpected key: ", k
l = short.unpack(bitfile.read(2))[0]
d = bitfile.read(l)
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