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#!/usr/bin/env python
import sys, struct, zlib
from elftools.elf.elffile import ELFFile
infile = sys.argv[1]
outfile = sys.argv[2]
e = ELFFile(open(infile))
buf = ''
for segment in sorted(e.iter_segments(), key = lambda x: x.header.p_paddr):
if segment.header.p_type != 'PT_LOAD':
continue
data = segment.data()
lma = segment.header.p_paddr
# Workaround for LD aligning segments to a larger boundary than 8k.
if lma == 0x8000000:
lma += 0x2000
data = data[0x2000:]
# Add padding if necessary.
buf += '\0' * (lma - 0x8002000 - len(buf))
buf += data
# Align to 64B
if len(buf) & (64 - 1):
buf += '\0' * (64 - (len(buf) & (64 - 1)))
# Add DFU suffix
buf += struct.pack('<HHHH3sB',
0xffff,
0x5679,
0x1234,
0x0100,
'UFD',
16,
)
# Calculate CRC.
buf += struct.pack('<I', ~zlib.crc32(buf) & 0xffffffff)
open(outfile, 'w').write(buf)
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