I solved this problem a while ago using
https://github.com/pcengines/apu_gpio_lib
since gpio(4), that they linked to, only seems to work for APU1.
I have no such device mentioned in dmesg(8) on my APU2,
and gpioctl(8) says all /dev/gpio? devices are not configured.
OpenBSD does not allow direct memory access in default securelevel(7),
so I wrote a small daemon that I start from rc.securelevel(8) which
reads one byte commands from a fifo to control the leds.
In my case ifstated(8) writes to the fifo to show status.
This solution works just fine for me.
Unfortunately the code is in a lousy state build-wise, so I need to clean
it up and for example create a pull request for PCEngines' repository
to add this daemon as an OpenBSD example. Even if they would not
accept a pull request it would be published my GitHub account...
/ Raimo Niskanen
On Fri, May 08, 2020 at 09:43:38PM +0200, Sacha wrote:
> Dear all,
>
> I'm enjoying OpenBSD on PC Engines hardwares called APU2:
> https://www.pcengines.ch/apu2.htm
>
> There is 3 led, which could be very usefull to deliver informations to
> the endusers, but I never could control them with OpenBSD /o\
>
> Is any way to make it work ?
>
> On PCEngines forum I got the following answer:
>
> >You cannot control the GPIOs on J20, because those are are driven by
> a NCT5104D and wbsio(4) only supports hardware monitoring.
> >The LEDs OTOH are on GPIOs of the AMD FCH. I am not a hardware guy, and
> OpenBSD seems to have a lot of drivers which attach - but probably none
> for those GPIOs.
> >If you want to dig deeper, there is AMD documentation for the FCH and
> also a linux driver called "amd-fch-gpio"
>
> >Update: There seems to be somebody, who worked on this a while ago on
> OpenBSD: https://marc.info/?l=openbsd-tech&m=155355977613046
>
>
> Sacha.
--
/ Raimo Niskanen, Erlang/OTP, Ericsson AB
