Navio2 PWM programmability

Is there documentation on programming the PWM outputs on the Navio2?

I’m specifically interested in what is the available frequency range. I’m going to be driving some large brushed DC motors through H-bridges, and a PWM frequencyof 20 KHz would be desirable.

Theoretically yes, 20KHz is possible But current firmware only allows up to 490Hz.

Actually the PWM output is not 490Hz, but actually 400Hz.

My mistake, it actually is 400Hz.