I have found that the TWR-S12G128 Demostration board is loaded with a bootloader. The documentation for the board states this,
The OSBDM is pre-programmed with a bootloader application to
allow field updates. The USB bootloader communicates with a
GUI application running on a host PC. The GUI application allows
the user to update OSBDM firmware easily and quickly. Option
jumper JP401 enables the bootloader at startup. This option
header is not populated in default configuration. Refer to
Freescale Application Note AN3561 for details on using the
GUI application and bootloader. The application note may be
found at www.freescale.com or at www.axman.com/support.
Where can I get a copy of this bootloader and the PC software used for the updates.