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trezor-firmware/legacy/bootloader/combine/prepare.py

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#!/usr/bin/env python
from __future__ import print_function
bl = open("bl.bin").read()
fw = open("fw.bin").read()
combined = bl + fw[:256] + (32768 - 256) * "\x00" + fw[256:]
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open("combined.bin", "w").write(combined)
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print("bootloader : %d bytes" % len(bl))
print("firmware : %d bytes" % len(fw))
print("combined : %d bytes" % len(combined))