Bonjour Olivier,
The reference design is made of a software and a firmware. The software is configuring the FMC204 via Ethernet. The firmware element receiving host transaction is the star sip_mac_engine.
What I would do is directly work on the FMC204 reference firmware. Check inside there is a star_lib. If you look at sip_fmc204\sip_files you will see different files typically:
sip_fmc204_v6.lst is the list of all the star files for v6 platform. The path to LST file is what goes in the SDF file in the star declaration area. You are using the same platform so you should not need to change that.
If you look at ml605_fmc204.sdf in the implement folder, you will see that TRGT_FPGA_TYPE should be updated for the FPGA type you have on your board. TRGT_BOARD is something you need to change, you should choose a name, I use HTGV6L550 as name for the remaining explanation.
The following line is correct and don't need to be changed:
STAR sip_fmc204 ,ID=0 ,FILE=sip_fmc204\sip_files\sip_fmc204_v6.lst;
Actually this tells StelarIP that the star file list is sip_fmc204_v6.lst and that the star sip_fmc204 is attached to ID 0.
About the UCF. With TRGT_BOARD = ML605 and ID=0, StellarIP expect a sip_fmc204_ml605_0.ucf file. The name is made of star name, board type and ID. On your side you would create a sip_fmc204_htgv6l550_0.ucf based on the other one.
Now that this "secret" is revealed you understand how the same star can target many boards.
If you keep other information the same in your sdf (typically ID) then the default software should run just fine, this of course assumes you get Ethernet working on your board.
You will also need to do that same trick for sip_mac_engine (the ethernet engine) and sip_fmc_ct_gen (a clock trigger generation). The second one is generally outputting clock/trigger on SMA connector present on Xiinx dev boards.
As soon you have stars modified and an updated sdf, you can use StellarIP to generate a new firmware for you. Note that you could also decide to use StellarIP once in order to get the complete FMC204-ML605 firmware and then modify the top level UCF by hand in there.
Best Regards,
Arnaud