no dev.cpu on RPI-B

[Ian Lepore]

On Wed, 2019-04-10 at 02:35 +0200, Bernd Walter wrote:
> On Wed, Apr 10, 2019 at 09:59:29AM +1000, Peter Jeremy wrote:
> > On 2019-Apr-10 00:39:18 +0200, Bernd Walter <
> > ticso at cicely7.cicely.de> wrote:
> > > I was hoping for dev.cpu.0.temperature as it exists on the Pi3.
> > > Is something missing in my setup (using 12-RELEASE kernel from
> > > image),
> > > or is there no support for that?
> > 
> > I ran into this when I switched from the FreeBSD FDT to the default
> > Linux FDT.
> > The latter is missing the CPU description.  The fix is to create
> > your own
> > FDT overlay and get the loader to load it.  There's a similar
> > problem with the
> > SPI controller.
> 
> Thank you very much.
> That makes sense, didn't thought about FDT because it works on a Pi3
> with the same 12.0-RELEASE.
> I'm already using overlays on those systems for SPI, my own APA102
> LED driver
> and DS18B20 sensors.
> It is for an LED matrix running 24 RPI1 with 800 LEDs each.
> The systems are nfsroot, but I think the dtso are loaded from the
> micro-SD
> cards :-(
> Well - I guess I setup a bootscript on the NFS server to update the
> data on
> the cards.
> 

I think that's true if you use uboot or the config.txt file to load the
overlays.  If you set fdt_overlays="file1.dtbo,file2.dtbo,etc" in
/boot/loader.conf the overlays should come from /boot/dtb/overlays in
the same /boot folder.

-- Ian