You can compile the firmware for this new target using 'make
BOARD=qmod'.
The QMOD differs from simtrace+owhw in terms of low-level
initialization, as it has an external 12MHz clock at XIN, thus bypasses
the main oscillator and needs different PLL configuration.
* ensure the PB8/PB9 pins are actually not in GPIO mode, which they
apparently are on boot-up
* ensure that neither pull-up nor pull-down are enabled on PB8/PB9
* ensure we first start the oscillator, before selecting it
The sum of the above changes seems to make oscillator start-up much more
reliable than before. The time needed for initialization is now pretty
stable, and the occasional 15-20second clock stabiliziation has not been
observed with this change.
