I have a board with DDR4 UDIMM and it is fail calibration around 7 out of 10 reset. Tried to change to other UDIMM device and the results is same.
I can run the emif toolkit when the calibration is pass. I can see the calibration results is good margin. So, i think this is not the margin issue. The emif toolkit is hang when i try to run during calibration is fail.