mirror of
https://github.com/tillitis/tillitis-key1.git
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82 lines
2.0 KiB
Python
82 lines
2.0 KiB
Python
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#!/usr/bin/env python
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import sys
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#
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# bistream to NVCM command conversion is based on majbthrd's work in
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# https://github.com/YosysHQ/icestorm/pull/272
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#
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def icebin2nvcm(bitstream: bytes) -> list[str]:
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# ensure that the file starts with the correct bistream preamble
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for origin in range(0, len(bitstream)):
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if bitstream[origin:origin + 4] == bytes.fromhex('7EAA997E'):
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break
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if origin == len(bitstream):
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raise Exception("Preamble not found")
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print("Found preamable at %08x" % (origin), file=sys.stderr)
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# there might be stuff in the header with vendor tools,
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# but not usually in icepack produced output, so ignore it for now
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# todo: what is the correct size?
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print(len(bitstream))
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rows = []
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rows.append('06')
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for pos in range(origin, len(bitstream), 8):
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row = bitstream[pos:pos + 8]
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# pad out to 8-bytes
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row += b'\0' * (8 - len(row))
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if row == bytes(8):
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# skip any all-zero entries in the bistream
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continue
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# NVCM addressing is very weird
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addr = pos - origin
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nvcm_addr = int(addr / 328) * 4096 + (addr % 328)
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row_str = "02%06x%s" % (nvcm_addr, row.hex())
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row_str = ' '.join([row_str[i:i + 2]
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for i in range(0, len(row_str), 2)]) + ' '
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rows.append(row_str)
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rows.append('04')
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return rows
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if __name__ == "__main__":
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import argparse
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parser = argparse.ArgumentParser()
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parser.add_argument('infile',
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type=str,
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help='input bin file')
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parser.add_argument('outfile',
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type=str,
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help='output nvcm file')
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args = parser.parse_args()
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with open(args.infile, 'rb') as f_in:
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bitstream = f_in.read()
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cmds = icebin2nvcm(bitstream)
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with open(args.outfile, 'w') as f_out:
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for cmd in cmds:
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f_out.write(cmd)
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f_out.write('\n')
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