Hi,
I'm trying to fix an error in my beaglebone green in which several PRU pin
directories are not available. I'm using image 4.19.50-ti-r20. I'm using,
Debian 10.2 which I have experienced as working well with the BBB and BBG.
The pins directories that don't show up are a sub-set of the 35 or so real
time PRU I/O pins. These pins are supposed to be available are
subdirectories of /sys/devices/platform/ocp/, as follows:
ocp:P8_11_pinmux
ocp:P8_12_pinmux*
ocp:P8_14_pinmux
ocp:P8_15_pinmux*
ocp:P8_16_pinmux
ocp:P8_17_pinmux
ocp:P8_18_pinmux
ocp:P9_28_pinmux*
ocp:P9_29_pinmux*
ocp:P9_30_pinmux*
ocp:P9_31_pinmux*
The ones (6 of them) with the asterisk are the real time PRU Input / Output
pins that I really really need for my application.
Notes:
This is on the Beaglebone Green, not the Beaglebone Black, I'll check if
the same problem shows up on BBB as well a little later...
This is image 4.19
I have already gone into the /boot/uEnv.txt file and disabled the
following: HDMI, audio, emmc. But I still have this same problem.
Is this a bug in the kernel / image ?
In reviewing page 211 of Derek Molloy's Exploring Beaglebone book, I can't
see a pattern of all these pins belonging to a certain interface, so I
cannot even guess what interface might be causing them to become not
available.
Please let me know if you have any ideas on this.
Thanks!!
On Tuesday, January 24, 2017 at 6:42:30 AM UTC-6, Lindo wrote:
>
> Hi,
>
> I'm trying to use cdsteinkuehler's beaglebone-universal-io
> <https://github.com/cdsteinkuehler/beaglebone-universal-io> to config
> P9_28-31 as spi interface. After loading cape-universal overlay first, I
> got the "P9_28 pinmux file not found!" message when I configure P9_28 pin
>
> config-pin P9.28 spi
> P9_28 pinmux file not found!
> cape-universala overlay not found
> run "config-pin overlay cape-universala" to load the cape
>
>
> I think P9.28 might not actually exported, and then I found that the
> cape-univeral-00A0.dts file on the github website is different with
> RobertCNelson's version(I found this file under
> /opt/source/bb.org-overlays/src/arm/). see detail here:
> https://www.diffchecker.com/BivnZllE
>
> Is this a bug? or I was doing wrong somewhere?
>
> Thanks!
> Lindo
>
>
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