I've bought a new "MKS GEN_L V1.0" and I'm trying to configure it with Marlin 1.1.X. I changed motherboard in configuration.h from previous:

#define BOARD_RAMPS_13_EFB 33 //RAMPS 1.3 (Power outputs:Hotend,Fan,Bed)


#define BOARD_MKS_GEN_L 53 //MKS GEN L.

I'm getting this error:

pins.h:268: error: #error "**Unknown MOTHERBOARD value set in Configuration.h**"
       #error "Unknown MOTHERBOARD value set in Configuration.h"
    In file included from sketch\MarlinConfig.h:42:0,
                     from sketch\G26_Mesh_Validation_Tool.cpp:27:

SanityCheck.h:58: error: #error "MOTHERBOARD is required. Please update your configuration."
       #error "MOTHERBOARD is required. Please update your configuration."
    SanityCheck.h:786: error: #error "**Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN requires the Z_MIN_PIN to be defined.**"
           #error "Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN requires the Z_MIN_PIN to be defined."

    SanityCheck.h:942: error: #error "**LCD_BED_LEVELING requires an LCD controller.**"
         #error "LCD_BED_LEVELING requires an LCD controller."

SanityCheck.h:1084: error: #error "**HEATER_0_PIN not defined for this board.**"
       #error "HEATER_0_PIN not defined for this board."
    exit status 1
#error "Unknown MOTHERBOARD value set in Configuration.h"


  • $\begingroup$ can you share the source where are you got source of configuration.h file $\endgroup$
    – vda
    Jun 2 '19 at 7:10
  • $\begingroup$ obviously, it is in the marlin folder. $\endgroup$
    – 2012User
    Jun 2 '19 at 18:21

The motherboard definition in configuration.h should be written like:


actually the word MOTHERBOARD was missing and there is no need to write 53 //MKS GEN L at the end.

The number definition is declared in boards.h - you just confused the two files, indeed you should not forget to define the motherboard constant itself. Do note that this is basically a RAMPS board, see pins_MKS_GEN_L.h.


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