PRU with 4.1.12-bone-rt-r16

[Amr Alanwar]

Hi All

I am facing problem with PRU on 4.1.12-bone-rt-r16

The error is when i call
root@beaglebone:/home/amr/chp13/PRUclock# echo EBB-PRU-Example > /sys/devices/platform/bone_capemgr/slots
-bash: echo: write error: Invalid argument

in dmesg it shows

[  375.463548] bone_capemgr bone_capemgr: part_number 'EBB-PRU-Example', version 'N/A'
[  375.463611] bone_capemgr bone_capemgr: slot #8: override
[  375.463650] bone_capemgr bone_capemgr: Using override eeprom data at slot 8
[  375.463693] bone_capemgr bone_capemgr: slot #8: 'Override Board Name,00A0,Override Manuf,EBB-PRU-Example'
[  375.464715] __of_adjust_tree_phandle_references: Could not find target property 'fixup' @/__local_fixups__
[  375.474644] bone_capemgr bone_capemgr: slot #8: Failed to resolve tree

Here is the dts file

/* Device Tree Overlay for enabling the pins that are used in Chapter 13
* This overlay is based on the BB-PRU-01 overlay
* Written by Derek Molloy for the book "Exploring BeagleBone: Tools and
* Techniques for Building with Embedded Linux" by John Wiley & Sons, 2014
* ISBN 9781118935125. Please see the file README.md in the repository root
* directory for copyright and GNU GPLv3 license information.
*/
/dts-v1/;
/plugin/;

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

   part-number = "EBB-PRU-Example";
   version = "00A0";

   /* This overlay uses the following resources */
   exclusive-use =
         "P9.11", "P9.13", "P9.27", "P9.28", "pru0";

   fragment@0 {
      target = <&am33xx_pinmux>;
      __overlay__ {

         gpio_pins: pinmux_gpio_pins {         // The GPIO pins
            pinctrl-single,pins = <
               0x070 0x07  // P9_11 MODE7 | OUTPUT | GPIO pull-down
               0x074 0x27  // P9_13 MODE7 | INPUT | GPIO pull-down
            >;
         };

         pru_pru_pins: pinmux_pru_pru_pins {   // The PRU pin modes
            pinctrl-single,pins = <
               0x1a4 0x05  // P9_27 pr1_pru0_pru_r30_5, MODE5 | OUTPUT | PRU
               0x19c 0x26  // P9_28 pr1_pru0_pru_r31_3, MODE6 | INPUT | PRU
            >;
         };
      };
   };

   fragment@1 {         // Enable the PRUSS
      target = <&pruss>;
      __overlay__ {
         status = "okay";
         pinctrl-names = "default";
         pinctrl-0 = <&pru_pru_pins>;
      };
   };

   fragment@2 {         // Enable the GPIOs
      target = <&ocp>;
      __overlay__ {
         gpio_helper {
            compatible = "gpio-of-helper";
            status = "okay";
            pinctrl-names = "default";
            pinctrl-0 = <&gpio_pins>;
         };
      };
   };
};
Thanks a lot