I have my stepup as per Ratrig connections, I haveb the three Z motors on M6, M7 and M8.
What ever I try to home gives me an "Unable to read tmc uart 'stepper_z2' register IFCN!" error.
I know its not hardware having tried different motors. I had read about others having the same problem with M8.
In the stepper config iy looks ok , so I 'm lost as to what check now.
I did a search but but still haven't found the answers.
Have others had this problem?