Failed to set up BBB for UIO

[p.c.s.l...@googlemail.com]

We're trying to set up BBB to run our own cape using UIO for speed.

I'm running Debian 2-12-19

We're using the .dtbo file that worked with the Slots scheme:

/dts-v1/;

/plugin/;

/ {

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

   part-number = "EBB-PRU-ADC";

   version = "00A0trf4";

   /* This overlay uses the following resources */

   exclusive-use =

          "P9.25","P9.27", "P9.28", "P9.29", "P9.30", "P9.31", "P8.46", "pru0", "pru1";

   fragment@0 {

      target = <&am33xx_pinmux>;

      __overlay__ {

         pru_pru_pins: pinmux_pru_pru_pins {   // The PRU pin modes

            pinctrl-single,pins = <

               // See Table 6-7, no pull up/down resistors enabled.  TRF MISO1 added

               0x1ac 0x2e       // MISO_2  P9_25 pr1_pru0_pru_r31_7, MODE6 | INPUT  | DIS  00101110=0x2e

               0x1a4 0x0d       // CS      P9_27 pr1_pru0_pru_r30_5, MODE5 | OUTPUT | DIS  00001101=0x0d

               0x19c 0x2e       // MISO_0  P9_28 pr1_pru0_pru_r31_3, MODE6 | INPUT  | DIS  00101110=0x2e

               0x194 0x2e       // MISO_1  P9_29 pr1_pru0_pru_r31_1, MODE6 | INPUT  | DIS  00101110=0x2e

               0x198 0x0d       // CLK     P9_30 pr1_pru0_pru_r30_2, MODE5 | OUTPUT | DIS  00001101=0x0d

               0x190 0x2e       // MISO_3  P9_31 pr1_pru0_pru_r31_0, MODE6 | INPUT  | DIS  00101110=0x2e

               // This is for PRU1, the sample clock -- debug only

               0x0a4 0x0d       // SAMP    P8_46 pr1_pru1_pru_r30_1, MODE5 | OUTPUT | DIS  00001101=0x0d

            >;

         };

      };

   };

fragment@1

       {         // kernel 4.14 - error to do this

      target = <&pruss>;

      __overlay__ {

         status = "okay";

         pinctrl-names = "default";

         pinctrl-0 = <&pru_pru_pins>;

      };

   };

};

This file compiled clean but for these warnings:

EBB-PRU-ADC4-00A1.dtbo: Warning (unit_address_vs_reg): Node /fragment@0 has a unit name, but no reg property

EBB-PRU-ADC4-00A1.dtbo: Warning (unit_address_vs_reg): Node /fragment@1 has a unit name, but no reg property

--------------------------------------------------------------------------------------

The uEnv.txt file is:

uname_r=4.14.71-ti-r80

#uuid=

#dtb=

###U-Boot Overlays###

###Documentation: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#U-Boot_Overlays

###Master Enable

enable_uboot_overlays=1

###

###Overide capes with eeprom

#uboot_overlay_addr0=/lib/firmware/<file0>.dtbo

#uboot_overlay_addr1=/lib/firmware/<file1>.dtbo

#uboot_overlay_addr2=/lib/firmware/<file2>.dtbo

#uboot_overlay_addr3=/lib/firmware/<file3>.dtbo

###

###Additional custom capes

#uboot_overlay_addr4=/lib/firmware/<file4>.dtbo

uboot_overlay_addr4=/lib/firmware/EBB-PRU-ADC4-00A1.dtbo

#uboot_overlay_addr5=/lib/firmware/<file5>.dtbo

#uboot_overlay_addr6=/lib/firmware/<file6>.dtbo

#uboot_overlay_addr7=/lib/firmware/<file7>.dtbo

###

###Custom Cape

#dtb_overlay=/lib/firmware/<file8>.dtbo

###

###Disable auto loading of virtual capes (emmc/video/wireless/adc)

#disable_uboot_overlay_emmc=1

disable_uboot_overlay_video=1

disable_uboot_overlay_audio=1

disable_uboot_overlay_wireless=1

disable_uboot_overlay_adc=1

###

###PRUSS OPTIONS

###pru_rproc (4.4.x-ti kernel)

#uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-4-TI-00A0.dtbo

###pru_rproc (4.14.x-ti kernel)

#uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-14-TI-00A0.dtbo

###pru_uio (4.4.x-ti, 4.14.x-ti & mainline/bone kernel)

uboot_overlay_pru=/lib/firmware/AM335X-PRU-UIO-00A0.dtbo

###

###Cape Universal Enable

#enable_uboot_cape_universal=1

###

###Debug: disable uboot autoload of Cape

#disable_uboot_overlay_addr0=1

#disable_uboot_overlay_addr1=1

#disable_uboot_overlay_addr2=1

#disable_uboot_overlay_addr3=1

###

###U-Boot fdt tweaks... (60000 = 384KB)

#uboot_fdt_buffer=0x60000

###U-Boot Overlays###

cmdline=coherent_pool=1M net.ifnames=0 quiet

#In the event of edid real failures, uncomment this next line:

#cmdline=coherent_pool=1M net.ifnames=0 quiet video=HDMI-A-1:1024x768@60e

#Use an overlayfs on top of a read-only root filesystem:

#cmdline=coherent_pool=1M net.ifnames=0 quiet overlayroot=tmpfs

##enable Generic eMMC Flasher:

#cmdline=init=/opt/scripts/tools/eMMC/init-eMMC-flasher-v3.sh

----------------------------------------

Pin 9_27 is one of ours. I woul hope that it was set up at reboot, but::

 config-pin -q P9.27

P9_27 pinmux file not found!

Cannot read pinmux file: /sys/devices/platform/ocp/ocp*P9_27_pinmux/state

--------------------------------------------

Can anyone see what we're doing wrong?

Thanks in advance

Peter Laurie

[p.c.s.l...@googlemail.com]

Apologies if this appears twice.

[Robert Nelson]

You defined P9_27 in the overlay..

and enable_uboot_cape_universal is disabled in your /boot/uEnv.txt

#enable_uboot_cape_universal=1

Thus config-pin can't access P9.27 thru
/sys/devices/platform/ocp/ocp*P9_27_pinmux/state

Regards,


--
Robert Nelson
https://rcn-ee.com/