Two programs are currently buildable in this target-utils tree: loadagent and
pirexplore.  Loadagent is built to be loaded and run out of the Calypso internal
(on-chip) RAM, and does not depend on any hardware outside of the Calypso chip
itself - thus it should run unchanged on all Calypso targets.  It expects to be
loaded by the Calypso ROM bootloader in the UART download mode, and it reads a
RAM variable left behind by the ROM code that indicates which UART has been used
to perform that download - it then uses that same UART to communicate with the
host, presenting an interactive command prompt.  You can run loadagent "raw" by
loading loadagent.srec with fc-iram, but normally it is used "behind the scenes"
by fc-loadtool and fc-xram.

Pirexplore is built in the same manner as loadagent (also runs out of IRAM,
expects to be loaded with fc-iram, and presents an interactive command prompt
on the autodetected UART), but it automatically performs some hardware (board
level) initialization specific to the Pirelli, and offers additional commands
for exploring the hardware features of this device.