[BUG]#error Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN requires the Z_MIN_PIN to be defined." about marlin HOT 2 CLOSED

add #define NEEDS_Z_MINMAX to Your Configuration.h

eg

#ifndef MOTHERBOARD
  #define MOTHERBOARD BOARD_BTT_OCTOPUS_V1_1
  #define NEEDS_Z_MINMAX
#endif

also you have in Configuration_adv.h "#define E0_AUTO_FAN_PIN 44 // turn off extruder fan when it's temperature is above 50°C"
pin 44. is not a valid fan pin on this controller. This will do unexpected things on an octopus board

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After seeking help from the community, if the consensus points to a bug in Marlin, then you should post a bug report.

from marlin.

Configuration.zip
Configuration_adv.zip
I have managed to compile, now there is something strage regarding endstops:

Using recomanded no jumpers on DIAG pins all endstops are triggered - with or no connection with switches

Putting DIAG first 2 jumpers ,( i think one corresponding to motor 0 and 1 ) the probe x_max, y_max, z_min are working OK
but not the case with z_max: that is always TRIGGERED

The DIAG jumpers are not working ok

There any patch to this?

from marlin.