Hello all,
I am trying to load the sample overlay from Derek Molloy's book, here is
the .dto 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>;
> };
> };
> };
> };
>
>
First I compile it:
dtc -O dtb -o EBB-PRU-Example-00A0.dtbo -b 0 -@ EBB-PRU-Example.dts
and then as instructed I do:
sudo cp EBB‐PRU‐Example‐00A0.dtbo /lib/firmware
sudo sh ‐c "echo EBB‐PRU‐Example > $SLOTS"
Now when I check $SLOTS:
xsentius@beaglebone:~/attemp2/overlay$ cat $SLOTS
0: 54:PF---
1: 55:PF---
2: 56:PF---
3: 57:PF---
4: ff:P-O-- Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G
5: ff:P-O-- Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI
6: ff:P-O-- Bone-Black-HDMIN,00A0,Texas Instrument,BB-BONELT-HDMIN
7: ff:P-O-L Override Board Name,00A0,Override Manuf,EBB-PRU-Example
I can see it is loaded successfully, however when I check $PINS:
xsentius@beaglebone:~/attemp2/overlay$ sudo cat $PINS|grep '103\|105'
pin 103 (44e1099c) 00000027 pinctrl-single
pin 105 (44e109a4) 00000027 pinctrl-single
I see that their values are not changed. They should be equal to 26 and 5.
What do you think the problem might be?
Thanks
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