pru pinmux not working

command used

debian@beaglebone:~$ sudo vim /lib/firmware/PRU-GPIO-EXAMPLE2.dts
debian@beaglebone:~$ sudo dtc -O dtb -o /lib/firmware/PRU-GPIO-EXAMPLE2.dtbo -b 0 -@ /lib/firmware/PRU-GPIO-EXAMPLE2.dts
debian@beaglebone:~$ sudo reboot
debian@beaglebone:~/pru_work/pru$ vim p8_12.p 
debian@beaglebone:~$ cd pru_work/pru

------ after changing the pru.cpp file by putting .bin destination of program p8_12.bin-------

debian@beaglebone:~/pru_work/pru$ sudo pasm -b p8_12.p debian@beaglebone:~/pru_work/pru$ sudo arm-linux-gnueabihf-g++ pru.cpp prussdrv.c -o p8_12_out -w
debian@beaglebone:~/pru_work/pru$ sudo ./p8_12_out
 
--------------------------------- 
but it is not reflecting any change pin p8_12 in mode 6 as refernce from http://pinmux.tking.org/index.html and from dev.ti.com

p8_12.p

.origin 0
.entrypoint start

#define INS_PER_MS    200 * 1000
#define ON_DURATION   550 * INS_PER_MS
#define OFF_DURATION  550 * INS_PER_MS

start:
    lbco r0, CPRUCFG, 4, 4   // read SYSCFG
    clr  r0.t4               // clear SYSCFG[STANDBY_INIT]
    sbco r0, CPRUCFG, 4, 4   // enable OCP master port;
    
    MOV r0, ON_DURATION
	
DELAY_ON:SUB r0, r0, 1
	 QBNE DELAY_ON, r0, 0
	
	// try EGPIO
	SET r30, r30, 14 //p8_12 pin 
	MOV r0, OFF_DURATION
	    	
DELAY_OFF:SUB r0, r0, 1
	  QBNE DELAY_OFF, r0, 0
	
	// try EGPIO
	CLR r30, r30, 14 //p8_12 pin
	MOV r0, ON_DURATION
QBA DELAY_ON	 		  

PRU-GPIO-EXAMPLE1.dts

/dts-v1/;
/plugin/;

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

    // identification
    part-number = "PRU-GPIO-EXAMPLE2";
    version = "00A0";

    // resources
    exclusive-use =
    "P8.11",
		"P8.12",
		"P8.20",
		"P8.21",
		"pru0";


    // pinmux
    fragment@0 {
        target = <&am33xx_pinmux>;
        __overlay__ {
	    pinctrl_test: PRU-GPIO-EXAMPLE2-pins{
		pinctrl-single,pins= <
			AM33XX_IOPAD(0x900, PIN_OUTPUT | MUX_MODE5) /* (G19) mmc0_clk.pr1_pru0_pru_r30[12] */
			AM33XX_IOPAD(0x904, PIN_OUTPUT | MUX_MODE5) /* (G17) mmc0_cmd.pr1_pru0_pru_r30[13] */
			AM33XX_IOPAD(0x830, PIN_OUTPUT | MUX_MODE6) /* (U13) gpmc_ad12.pr1_pru0_pru_r30[14] */
			AM33XX_IOPAD(0x834, PIN_OUTPUT | MUX_MODE6) /* (T13) gpmc_ad13.pr1_pru0_pru_r30[15] */
		>;
            };

        };
    };


    // PRU
    fragment@1 {
        target = <&ocp>;
        __overlay__ {
		test_helper: helper {
			compatible = "bone-pinmux-helper";
			status = "okay";
			pinctrl-names = "default", "gpio";
			pinctrl-0 = <&pinctrl_test>;
		};
        };
    };

    fragment@2 {
        target = <&pruss>;
        __overlay__ {
            status = "okay";
        };
    };

};


-----------------------------------------------------------
-------------------------ERROR------------------------
debian@beaglebone:~$ sudo dtc -O dtb -o /lib/firmware/PRU-GPIO-EXAMPLE2.dtbo -b 0 -@ /lib/firmware/PRU-GPIO-EXAMPLE2.dts
Error: /lib/firmware/PRU-GPIO-EXAMPLE2.dts:26.8-9 syntax error
FATAL ERROR: Unable to parse input tree
debian@beaglebone:~$ 

PRU-GPIO-EXAMPLE2.dts

//  this file is without pinmux generated file from dev.ti.com
// pin refernce from http://pinmux.tking.org/p9.html


/dts-v1/;
/plugin/;

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

    // identification
    part-number = "PRU-GPIO-EXAMPLE2";
    version = "00A0";

    // resources
    exclusive-use =
        	"P8.11",
		"P8.12",
		"P8.20",
		"P8.21",
		"pru0";


    // pinmux
    fragment@0 {
        target = <&am33xx_pinmux>;
        __overlay__ {
	    pinctrl_test: PRU-GPIO-EXAMPLE2-pins{
		pinctrl-single,pins= <
		/*	0x034 0x06 /* p8_11 45  gpio1_13 in no pull mode6 */
		/*	0x030 0x06 /* p8_12 44  gpio1_12 in no pull mode6 */
		/*	0x084 0x05 /* p8_20 63  gpio1_31 in no pull mode5 */
		/*	0x080 0x05 /* p8_21 62  gpio1_30 in no pull mode5 */			
			/* OUTPUT  GPIO(mode7) 0x07 pulldown, 0x17 pullup, 0x?f no pullup/down */
			/* INPUT   GPIO(mode7) 0x27 pulldown, 0x37 pullup, 0x?f no pullup/down */
		>;
            };

        };
    };


    // PRU
    fragment@1 {
        target = <&ocp>;
        __overlay__ {
		test_helper: helper {
			compatible = "bone-pinmux-helper";
			status = "okay";
			pinctrl-names = "default", "gpio";
			pinctrl-0 = <&pinctrl_test>;
		};
        };
    };

    fragment@2 {
        target = <&pruss>;
        __overlay__ {
            status = "okay";
        };
    };

};