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    Genna got a reaction from chrism in Missing access to all PWM outputs   
    If you just want to get PWM running do the following:
    create a file (lets name it pwm_cd.dts) with this contents
    /dts-v1/; /plugin/; /{ fragment@0 { target = <&pwm_cd>; __overlay__{ status = "okay"; pinctrl-names = "default"; pinctrl-0 = <&pwm_c_x5_pins &pwm_d_x3_pins>; }; }; };  
    compile that file with
    dtc -I dts -O dtb pwm_cd.dts -o pwm_cd.dtbo  
    create a directory for user overlays and move that file there
    mkdir /boot/overlay-user cp pwm_cd.dtbo /boot/overlay-user/  
    edit /boot/armbianEnv.txt and add the following line
    user_overlays=pwm_cd then do a reboot and you should be able to use PWM_C and PWM_D with sysfs like
    cd /sys/class/pwm/pwmchip-2/ echo 0 > export echo 1000000 > pwm0/period echo 50000 > pwm0/duty_cycle echo 1 > pwm0/enable  
    This can be done for the other PWM's as well. You'll just have to figure out which pinctrl-names you have to use by comparing the files from odroid (overlays and dtb) with the dtb from armbian.