    info!("Calculate ROM partition sizes & Create the layout file.");
    let rom_sz: i64 = cmd.get_size()?;
    let layout_sizes = utils::get_layout_sizes(rom_sz)?;
    {
        let mut f = File::create(LAYOUT_FILE)?;
        let mut buf: Vec<u8> = vec![];
        utils::construct_layout_file(&mut buf, &layout_sizes)?;

        f.write_all(&buf)?;
        if print_layout {
            info!(
                "Dumping layout file as requested:\n{}",
                String::from_utf8_lossy(&buf)
            );
        }
    }