@Robert,
I think I found the answer to your question. From a text file based on
something another person on these forums was discussing with me . . .
# put in /etc/modprobe.d/uio.conf
#
# make driver match on compatible = "uio";
options uio_pdrv_genirq of_id=uio
# put in /etc/udev/rules.d/uio.rules
#
# create named symlink to locate the device easily
# (assumes your kernel is new enough to have of_node symlinks in sysfs)
SUBSYSTEM=="uio", SYMLINK+="uio/%s{device/of_node/uio-alias}"
#
# give some group access rights (adjust as needed)
SUBSYSTEM=="uio", GROUP="users", MODE="0660"
So this was in relation to setting up a UIO ADC driver, and was pasted by
this same person as something for me to experiment with. Anyway this file I
have was created 11-19-2015, which is a pretty good indication of the date
when the discussion took place.
On Thu, Apr 21, 2016 at 8:25 PM, Robert Nelson <[email protected]>
wrote:
>
>
> On Thu, Apr 21, 2016 at 10:04 PM, Charles Steinkuehler <
> [email protected]> wrote:
>
>> On 4/21/2016 9:43 PM, Charles Steinkuehler wrote:
>> > On 4/21/2016 9:37 PM, Robert Nelson wrote:
>> >>
>> >> Does the uio_pruss still work if we just nuke that whole udev rule??
>> >
>> > Testing....
>>
>
> Thanks for testing Charles!
>
>
>>
>> Commenting the first line (with SYMLINK+=):
>> ==========
>> No excessive CPU usage when loading a PRU device-tree overlay.
>
>
>>
>> Commenting both lines (same as not having a uio.rules file):
>> ==========
>> No excessive CPU usage when loading a PRU device-tree overlay
>>
>> /dev/uio* permissions change from 0660 to 0600
>>
>>
>> In both instances, I can use the PRU as expected (Machinekit loads and
>> moves motors).
>>
>> I would recommend leaving the permissions rule (the second line) but
>> comment out the first line (the SYMLINK+ line). Honestly, IMHO there
>> should be a udev rule that creates a device node that has "pru" or
>> "pruss" in it somewhere, but since that's not how it was done
>> previously... ;-)
>>
>
> I'll push the first line commenting change..
>
> Regards,
>
> --
> Robert Nelson
> https://rcn-ee.com/
>
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