Found this in dmesg:
[   30.418037] pinctrl-single 44e10800.pinmux: pin PIN103 already requested 
by 48038000.mcasp; cannot claim for 4a300000.pruss
[   30.580322] pinctrl-single 44e10800.pinmux: pin-103 (4a300000.pruss) 
status -22
[   30.692649] pinctrl-single 44e10800.pinmux: could not request pin 103 
(PIN103) from group foo_pins  on device pinctrl-single

Looks like P9.28 is used by something else. What is mcasp?

On Thursday, December 14, 2017 at 1:08:01 PM UTC-7, Robert Nelson wrote:
>
> On Thu, Dec 14, 2017 at 2:02 PM,  <[email protected] <javascript:>> 
> wrote: 
> > Thanks Bas! I've attached a more verbose log. It looks like it's 
> something 
> > PRU related. 
>
> Dec 14 19:59:25 pocketnc rtapi:0: 4:rtapi_app:2498:user hpg: module 
> 'uio_pruss' already loaded 
> Dec 14 19:59:25 pocketnc rtapi:0: 1:rtapi_app:2498:user hpg: ERROR: 
> failed to initialize PRU 
> Dec 14 19:59:25 pocketnc rtapi:0: 4:rtapi_app:2498:user halg_exit:293 
> HAL: removing component 686 'hal_pru_generic' 
> Dec 14 19:59:25 pocketnc rtapi:0: rtapi_app_main(hal_pru_generic): -1 
> Operation not permitted 
> Dec 14 19:59:25 pocketnc rtapi:0: 1:rtapi_app:2498:user 
> rtapi_app_main(hal_pru_generic): -1 Operation not permitted 
> Dec 14 19:59:25 pocketnc rtapi:0: 4:rtapi_app:2498:user pid=2498 
> flavor=rt-preempt gcc=4.9.2 git=v0.1~-detached~50f3952 
>
> That's a little odd.. already loaded/failed to initialize... 
>
> Regards, 
>
> -- 
> Robert Nelson 
> https://rcn-ee.com/ 
>

-- 
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