no dev.cpu on RPI-B

[Peter Jeremy]

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.

I used the FDT below, compiled with:
$ dtc -@ -O dtb -o /boot/dtb/overlays/rpi-cpus.dtbo -i /usr/src/sys/dts/arm -i /usr/src/sys/gnu/dts/arm rpi-cpus.dtso

And add the following to loader.conf:
fdt_overlays="rpi-cpus.dtbo"

------- rpi-cpus.dtso
/dts-v1/;
/plugin/;

/ {
        compatible = "brcm,bcm2835";
};

&{/} {
        cpus {
                cpu at 0 {
                        compatible = "arm,1176jzf-s";
                        device_type = "cpu";
                        reg = <0x0>;
                        clock-frequency = <0x29b92700>;
                };
        };
};

-- 
Peter Jeremy
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