".....>myconfig.cfg" is the board/target initialization file. In case you have a supported board, there's already such init file in CodeWarrior layout.
Assuming you have a Freescale Reference PQ2-FADS board with 8270, then the init file is {CW}\PowerPC_EABI_Support\Initialization_Files\PQ2\PQ27e_init.cfg
Also, note that for convenience, there're all flash programmer specific settings for reference boards stored in CodeWarior layout. After you open flash programmer window, use "Load Settings" button, and browse for {CW}\PowerPC_EABI_Support\Initialization_Files\PQ2\PQ27e_init.cfg
(Assuming you have PQ2-FADS reference board). Make sure you have correct connection settings in flash programmer window after loading new settings.
Regards,
Teo