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

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#!/usr/bin/env python3
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bl = open("bl.bin", "rb").read()
fw = open("fw.bin", "rb").read()
combined = bl + 32768 * b"\xff" + fw
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open("combined.bin", "wb").write(combined)
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print(f"bootloader : {len(bl)} bytes")
print(f"firmware : {len(fw)} bytes")
print(f"combined : {len(combined)} bytes")