Checked the Qlink sources
Found the likely problem:

The Qlink verison posted turned out to be a temporary test - jerry rigged to use 1mbps by reducing clock freq by factor 3 in mmcm48.vhd

I updated the homepage - Qlink-2026-03-24 is now adapted to Sindri and is tested!

The old stuff probably works with 1mbps - but the clock freq is only 12MHz not 48 .. so get rid of that!!

I included some good assignments in the new source .. they work toward the project!