> From: Johannes Krottmayer <krj...@gmail.com> > Date: Fri, 8 Jun 2018 03:54:37 +0200 > > Hello Mark! > > I have found the necessary information to control the GPIO. > But what about the I2C and SPI interface? > > I don't find usefull information about this. I want native > support for my projects. Don't want to make a software based > (bit-bang) I2C or SPI interface with the GPIO pins.
There currently is no SPI support at all in OpenBSD. I2C is available within the kernel. For armv7 and arm64 the recommended practice is to modify the device tree to include any additional I2C devices you add to your board. Ideally you'd be able to use device tree overlays, but that is not implemented yet. We quite deliberately don't allow userland access to the I2C bus. Currently the rkgpio(4) driver does not expose itself to userland either, so the information in the gpio(4) and gpioctl(8) manual pages doesn't applt.. That shouldn't be hard to implement though, preferably in a similar way as in sxigpio(4) where only pins that aren't claimed by other devices and left unconfigured by the firmware are exposed. Cheers, Mark > On Fri, Jun 08, 2018 At 03:42:11 +0200, Johannes Krottmayer wrote: > > Hello Mark, > > > > I just installed OpenBSD sucessfully on the ROCK64 media board. > > That's very cool. Thanks for your good statement. > > > > Best reagards, > > Johannes > > > > On Fri, Jun 08, 2018 At 00:52:51 +0200, Johannes Krottmayer wrote: > >> Hello Mark, > >> > >> I have an additional question. Don't want start a new thread for > >> this. > >> > >> Are the GPIO, the I2C and the SPI interface working? > >> An how can i use this. Is there a short example code available? > >> > >> I'm new in this. I have experience in bare-metal programming > >> with AVR devices. Now I want use the ARM port of OpenBSD for my > >> further electronic projects. > >> > >> Best reagards, > >> Johannes Krottmayer > >> > >> On Fri, Jun 08, 2018 At 00:28:30 +0200, Johannes Krottmayer wrote: > >>> Hello Mark, > >>> > >>> Thanks for the fast reply and this information! > >>> I will try this steps. > >>> > >>> Best regards, > >>> Johannes Krottmayer > >>> > >>> On Fri, Jun 08, 2018 At 00:20:30 +0200, Mark Kettenis wrote: > >>>>> From: Johannes Krottmayer <krj...@gmail.com> > >>>>> Date: Thu, 7 Jun 2018 23:23:21 +0200 > >>>>> > >>>>> Hello, > >>>>> > >>>>> Currently the Gigabit network of the ROCK64 media board > >>>>> doesn't work with OpenBSD 6.3. > >>>>> > >>>>> Is there a chance in further releases to get this work? > >>>>> It would be great! > >>>> > >>>> It works in -current. There is also DMA support for eMMV and uSD card > >>>> in -current. > >>>> > >>>> I flashed my board with the firmware provided by "ayufan" that can be > >>>> found at: > >>>> > >>>> https://github.com/ayufan-rock64/linux-build/releases > >>>> > >>>> The device tree embedded in that firmware doesn't provide the proper > >>>> speed for the serial console. Therefore when you boot the board after > >>>> installing it the boot messages will not show up on the serial > >>>> console. You can fix this by installing the dtb package and doing > >>>> > >>>> # mount /dev/sdXi /mnt > >>>> # mkdir /mnt/rockchip > >>>> # cp /usr/local/share/dtb/arm64/rockchip/rk3328-rock64.dtb > >>>> /mnt/rockchip > >>>> # umount /mnt > >>>> > >>>> You should also check the /etc/ttys file and change the console entry > >>>> from std.115200 into std.1500000 if necessary. > >>>> > >>>> I'll see if I can get that issue fixed. > >>>> > >>>> Cheers. > >>>> > >>>> Mark > >>>> > >
