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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
infile = sys.argv[1]
outfile = sys.argv[2]
fs = os.stat(infile).st_size
print(f"Current bootloader size before align is {fs} bytes")
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if fs > MAXSIZE:
raise Exception(
f"bootloader has to be smaller than {MAXSIZE} bytes (current size is {fs})"
)
with open(outfile, "wb") as f:
with open(infile, "rb") as i:
f.write(i.read())
f.write(b"\x00" * (TOTALSIZE - fs))