You can modify your existing FlashROM configuration the same way that you modify any configured core in SmartGen. To do so:
Open your SmartGen workspace that contains the configured FlashROM core.
Double-click the configured core (in the Configured Core View) to open the FlashROM configuration. The FlashROM core opens with all the settings you saved.
Modify the values you
wish to change and click Generate
to save your changes. Generate opens the Save As dialog. Save your new
file with the same name if you wish to overwrite the old file.
You cannot edit the configuration of an existing FlashROM GEN file,
only change the data. If you wish to change the configuration you must
generate a new core.