====== Install FreeBSD using serial console ======

  - Download FreeBSD memory stick image file (e. g. FreeBSD-13.0-CURRENT-amd64-20190531-r348447-memstick.img).
  - Copy the image file on an USB memory device. On macOS: <code>
$ sudo dd if=FreeBSD-13.0-CURRENT-amd64-20190531-r348447-memstick.img of=/dev/disk3 bs=1m conv=sync
</code>
  - Connect serial cable to the host that needs the FreeBSD installation.
  - Use a tool like screen to connect to that host. <code>
$ sudo screen /dev/ttyUSB0 115200
</code>
  - Start the host (e. g. connect power cable).
  - When FreeBSD boot menu appears, type 3 to enter loader prompt.
  - Set parameter and continue booting. <code>
set comconsole_speed=115200
set console=comconsole
boot
</code>
  - Install FreeBSD as you like, but answer the last question before reboot ("The installation is now finished. Before exiting the installer, would you like to open a shell in the new system to make any final manual modifications?") with yes.
  - Add these lines to the file /boot/loader.conf <code>
comconsole_speed=115200
console=comconsole
</code>
  - Type exit to reboot in your new FreeBSD system.