Hello,
I found this bunch of info:
https://elinux.org/Beagleboard:BeagleBoneBlack_Debian#Where_did_the_slots_file_go.3F
.
Seth
On Friday, April 26, 2019 at 3:07:18 PM UTC-5, Jon Elson wrote:
>
> I did a Beagle Bone PRU project in 2014, based on the Machinekit build,
> but otherwise not related to Machinekit. Now, I've got another similar
> project.
> I am working with the April 14 2019 Machinekit download.
> I need 11 PRU direct outputs and 2 direct inputs. I created a .dts file
> for the earlier project that is pretty close :
>
> /dts-v1/;
> /plugin/;
>
> / {
> compatible = "ti,beaglebone", "ti,beaglebone-black";
>
> part-number = "BB-BONE-PRU";
> version = "00A0";
>
> exclusive-use =
> "P8.45",
> "P8.46",
> "P8.43",
> "P8.44",
> "P8.41",
> "P8.42",
> "P8.39",
> "P8.40",
> "P8.27",
> "P8.29",
> "P8.28",
> "P8.30",
> "P9.26",
> "P8.20",
> "P8.21";
>
> fragment@0 {
> target = <&am33xx_pinmux>;
> __overlay__ {
> mygpio: pinmux_mygpio{
> pinctrl-single,pins = <
> 0xa0 0x05 // P8.45 PRU1_out0
> 0xa4 0x05 // P8.46 PRU1_out1
> 0xa8 0x05 // P8.43 PRU1_out2
> 0xac 0x05 // P8.44 PRU1_out3
> 0xb0 0x05 // P8.41 PRU1_out4
> 0xb4 0x05 // P8.42 PRU1_out5
> 0xb8 0x05 // P8.39 PRU1_out6
> 0xbc 0x05 // P8.40 PRU1_out7
> 0xe0 0x05 // P8.27 PRU1_out8
> 0xe4 0x05 // P8.29 PRU1_out9
> 0xe8 0x05 // P8.28 PRU1_out10
> 0xec 0x05 // P8.30 PRU1_out11
> 0x180 0x36 // P9.26 PRU1_in16 mode 6, pull-up, RX active
> 0x84 0x36 // P8.20 PRU1_in13 mode 6, pull-up, RX active
> 0x80 0x36 // P8.21 PRU1_in12 mode 6, pull-up, RX active
>
> >;
> };
> };
> };
>
> fragment@1 {
> target = <&ocp>;
> __overlay__ {
> test_helper: helper {
> compatible = "bone-pinmux-helper";
> pinctrl-names = "default";
> pinctrl-0 = <&mygpio>;
> status = "okay";
> };
> };
> };
>
> fragment@2{
> target = <&pruss>;
> __overlay__ {
> status = "okay";
> };
> };
> };
>
> ------------ end of file ---------------------
> Is this syntax still correct?
>
> And, then, how do you install the devicetree overlay?
> This is how I did it before :
> modprobe uio_pruss
>
> cp BB-BONE-PRU-00A0.dtbo /lib/firmware/
>
> echo BB-BONE-PRU:00A0 > /sys/devices/bone_capemgr.9/slots
>
> more /sys/devices/bone_capemgr.9/slots
> _________end of file ________
>
> But, this now gives an error,
>
> ./dtc_load: 5: ./dtc_load: cannot create
> /sys/devices/bone_capemgr.9/slots: Directory nonexistent
>
> Is there a document that explains how to do this?
>
> Thanks much for any help!
>
> Jon
>
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