TMC2100 stepper motor drivers not detected on SKR 1.4 turbo with RepRap firmware
As @towe mentioned, 'no-driver-detected' messages in Octoprint log are harmless if you have TMC2100 motors. After experimenting with RepRap settings I found the correct configuration that works with my hardware. Here is the relevant part of the configuration.
; Drives
M569 P0 S1                                     ; physical drive 0 goes forwards
M569 P1 S1                                     ; physical drive 1 goes forwards
M569 P2 S1                                     ; physical drive 2 goes forwards
M569 P3 S0                                     ; physical drive 3 goes backwards
M584 X0 Y1 Z2 E3                               ; set drive mapping
M350 X16 Y16 Z16 E16 I1                        ; configure microstepping with interpolation
M92 X100.00 Y100.00 Z100.00 E100.00            ; set steps per mm
M566 X1200.00 Y1200.00 Z1200.00 E300.00        ; set maximum instantaneous speed changes (mm/min)
M203 X48000.00 Y48000.00 Z48000.00 E1500.00    ; set maximum speeds (mm/min)
M201 X1500.00 Y1500.00 Z1500.00 E1000.00       ; set accelerations (mm/s^2)
M906 X1000 Y1000 Z1000 E800 I30                ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                        ; Set idle timeout