TI's TCS211 program supported 3 different Calypso silicon versions on their
D-Sample and Leonardo boards: C05B (CHIPSET 8, DSP 33), early C035 (CHIPSET 10,
DSP 34) and final C035 (CHIPSET 10, DSP 36).  In FreeCalypso we generally work
only with the last chipset (final C035), but we would like to support the two
earlier ones as well, if possible.  C05B has been partially exercised on the
Mother's D-Sample board (non-functional Clara RF, no genuine tpudrv10.c source
and too many unknowns), but the early C035 version with DSP 34 has not been
tested at all yet.

All 3 Calypso chip versions in question are footprint-compatible, i.e., they
can all be populated onto the same PCB.  Changing between C05 and C035 requires
changing the VLRTC strapping on the Iota companion chip, thus not all boards
can support Calypso C05 (the newer ones are C035 only), but one can always
populate either early C035 (DSP 34) or final C035 (DSP 36) on the same PCB.
TI's own D-Sample and Leonardo development boards have most certainly been made
with all 3 Calypso silicon versions: D-Sample appears to support both C05 and
C035 on the same PCB; the schematics we have for Leonardo show fixed VLRTC
strapping for C035, but there also existed an earlier Leonardo version with
Calypso C05B.  Our own FCDEV3B also has fixed C035-only VLRTC strapping, our
regular boards have final C035 chips on them, but we should be able to build
some experimental boards with an early C035 variant (751774) for DSP 34 testing.

In the case of target boards that can have different Calypso chip versions
populated on them, we want to be able to target all of them without creating a
configuration explosion.  The implemented solution is that you can pass a target
argument to the ./configure.sh script of the following form:

dsample-c05b
dsample-dsp34
dsample-dsp36
leonardo-c05b
leonardo-dsp34
leonardo-dsp36
fcdev3b-dsp34

Our configure.sh script recognizes the hyphen as indicating this construct;
the word before the hyphen must be the conventional target name, and the word
after the hyphen needs to be one of c05b, dsp34 or dsp36, corresponding to the
three supported Calypso silicon versions.