Boot and install on Z83II (and probably similar HW)
Just wanted to share how I got my Z83II to boot pfSense.
Disable the memory card reader at boot by pressing "3" and then write:
set hint.uart.0.disabled=1 set hint.uart.1.disabled=1 boot
Complete the setup process, but before you finish, choose to go to terminal and add the following to /boot/loader.conf.local (with vi) to make the changes persistent:
That's it! I found all the clues that I needed in this thread.
EDIT: I found out it was enough to use only one hint (set hint.uart.1.disabled=1), but I'll leave them booth up just in case someone with different HW has use for it.