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