TMC stepper_x failed to init: Unable to read tmc uart 'stepper_x' register IFCNT
TMC stepper_y failed to init: Unable to read tmc uart 'stepper_y' register IFCNT
TMC stepper_z failed to init: Unable to read tmc uart 'stepper_z' register IFCNT
TMC extruder failed to init: Unable to read tmc uart 'extruder' register IFCNT
This means that Klipper was unable to communicate with a tmc2209 stepper motor driver. This often happens when power is applied to the micro-controller, but not to the stepper motors.
- Make sure power is fully up
- Double check the wiring.
- Double check that your board is really jumpered to UART
What driver modules do you use? And in my original config there was a typo: Extruder pin for E0 needs to be PD9 not PD8