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trezor-firmware/legacy/bootloader/firmware_align.py

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#!/usr/bin/env python3
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import os
import sys
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TOTALSIZE = 32768
MAXSIZE = TOTALSIZE - 32
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fn = sys.argv[1]
fs = os.stat(fn).st_size
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if fs > MAXSIZE:
raise Exception(
f"bootloader has to be smaller than {MAXSIZE} bytes (current size is {fs})"
)
with open(fn, "ab") as f:
f.write(b"\x00" * (TOTALSIZE - fs))
f.close()