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about 6 years ago
That's indeed correct. The firmware is delivered as a "Stellar IP" firmware. A GUI is delivered along with the BSP where you can simply browse to the sdf file contained by the implement folder. The sdf file is the actual top level description and StellarIP will create the ISE project for you based on your ISE version.
You can find some more details in the 4FM Getting Started Guide, there is a whole chapter covering StellarIP.