activation error of pinmux for pru1

[ABAN]

Hello

i'm new to using PRU, what i want to do is configure the pins P8.27, P8.28, P8.29 and P8.30 in BBB but i have trouble configuring them. The code i use is the following:

/dts-v1/;

/plugin/;

/ {

   compatible = "ti,beaglebone", "ti,beaglebone-black";

   part-number = "EBB-PRU-Example";

   version = "00A0";

   /* This overlay uses the following resources */

   exclusive-use =

         "P8.27", "P8.28", "P8.29", "P8.30", "pru1";

   fragment@0 {

      target = <&am33xx_pinmux>;

      __overlay__ {

         pru_pru_pins: pinmux_pru_pru_pins {   // The PRU pin modes

            pinctrl-single,pins = <

               0x0e0 0x0d  // P8_27 

               0x0e8 0x2e  // P8_28 

               0x0e4 0x0d  // P8_29

               0x0ec 0x0d  // P8_30

            >;

         };

      };

   };

   fragment@1 {         // Enable the PRUSS

      target = <&pruss>;

      __overlay__ {

         status = "okay";

         pinctrl-names = "default";

         pinctrl-0 = <&pru_pru_pins>;

      };

   };

};

After saving this i do the following:

root@beaglebone:~# dtc -O dtb -o EBB-PRU-Example-00A0.dtbo -b 0 -@ EBB-PRU-Example.dts

root@beaglebone:~# sudo sh -c "echo EBB-PRU-Example > /sys/devices/platform/bone_capemgr/slots"

Finally when reviewing the pins their values have not changed...

root@beaglebone:~# cat $PINS |grep '56\|57\|58\|59'

pin 22 (44e10858.0) 00000017 pinctrl-single

pin 56 (44e108e0.0) 00000000 pinctrl-single

pin 57 (44e108e4.0) 00000000 pinctrl-single

pin 58 (44e108e8.0) 00000000 pinctrl-single

pin 59 (44e108ec.0) 00000000 pinctrl-single

pin 86 (44e10958.0) 00000037 pinctrl-single

and when i check with dmesg it tells me the following and i do not know what it means:

root@beaglebone:~# dmesg |grep pru

[  229.784032] pinctrl-single 44e10800.pinmux: pin 44e108e0.0 already requested by 0-0070; cannot claim for 4a300000.pruss

[  229.794920] pinctrl-single 44e10800.pinmux: pin-56 (4a300000.pruss) status -22

[  229.802176] pinctrl-single 44e10800.pinmux: could not request pin 56 (44e108e0.0) from group pinmux_pru_pru_pins  on device pinctrl-single

[  229.814713] pruss_uio 4a300000.pruss: Error applying setting, reverse things back

Does anyone know what is happening here?

i would like to understand in detail what happens here. I hope you can help me clarify this, i'm using Linux beaglebone 4.4.145-bone23

Regards!!!