Due to a problem in the GTS Ethernet Hard IP in the Quartus® Prime Pro Edition software version 25.1, designs with Auto-Negotiation and Link Training (AN/LT) and ECC enabled may experience hardware failure.
When ECC is enabled in AN/LT designs, it shows a critical warning during the qsys stage, which prevents hex/mif from being loaded in the fitter stage, causing the hardware to fail.
To work around this problem, copy the imem and dmem hex files from “/intel_eth_gts_0_example_design/hardware_test_design/common/intel_eth_anlt_gts_0/intel_eth_anlt_gts_301/synth” folder to “/intel_eth_gts_0_example_design/hardware_test_design/” folder. This will resolve the problem.
This problem is scheduled to be fixed in a future version of the Quartus® Prime Pro Edition software.