Matthias Brugger wrote: > > > On 12/03/2019 09:04, Guillaume Gardet wrote: >> Hi Per, >> >>> -----Original Message----- >>> From: Per Jessen <p...@jessen.ch> >>> Sent: 12 March 2019 08:58 >>> To: opensuse-arm@opensuse.org >>> Subject: Re: [opensuse-arm] vcio, STRICT_DEVMEM >>> >>> Per Jessen wrote: >>> >>>> Matthias Brugger wrote: >>>> >>>>> On 10/03/2019 19:35, Per Jessen wrote: >>>>>> Well, at least I have a vcio module that builds now, we'll see it >>>>>> if it also works. >>>>>> >>>>> >>>>> It seems that there is another thread on this mailing list, but I >>>>> wasn't able to find it. What do you want to achieve? >>>> >>>> Hi Matthias, >>>> >>>> nothing too complex I hope, I just want to control a series of >>>> WS2812 LEDs, using the code/utilities from >>>> >>>> https://github.com/jgarff/rpi_ws281x >>> > > I had a look on that code and it looks like a hack to me.
I can't really comment - of the couple of projects I looked at (related to ws2812), this looked the most complete/useful. >>> I built the vcio module, seems to work fine. Then I built the >>> kernel without STRICT_DEVMEM and I can now control a string of >>> WS2812 LEDs. >> >> Thanks for your feedback! >> The vcio module can probably be upstreamed, or at least packaged in >> OBS, I guess. >> > > I don't think this is the right approach for upstream. If we want to > control these leds, then we should write a kernel driver which uses > the mbox and not implement detection etc in user-space. > If you want to use a LED matrix, then I think this is a good candidate > for a tinydrm driver in the kernel. again, I can't really comment on what is right or good - so just my observations: getting the vcio module to work was no big deal, just required a bit of research - I think even a relative newbie would manage to get it to work. About STRICT_DEVMEM - had I been able to disable with a kernel argument, that would have been really nice. In 2008, Bernhard Walle @ suse also proposed a sysctl "dev.mem.restricted", but I guess that didn't go through. -- Per Jessen, Zürich (5.0°C) member, openSUSE Heroes. -- To unsubscribe, e-mail: opensuse-arm+unsubscr...@opensuse.org To contact the owner, e-mail: opensuse-arm+ow...@opensuse.org
