The laser PWM pin can only be attached to PWM capable pins. (The laser enable pin can be attached to any free GPIO. To control the laser with the SKR board we need to connect two inputs of the laser PSU to free pins on the SKR board: the laser enable and the laser pwm input. Rename it to firmware.bin and upload that on your SKR board with either the USB cable or the SD-Card. The first thing you need to do is to get the latest version of smoothieware here.
Its been a while ago so this documentation may not be perfect.
I successfully set up an SKR 1.3 board to operate my K40 with Smoothieware running on it.
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