no dev.cpu on RPI-B

[Bernd Walter]

On Tue, Apr 09, 2019 at 06:44:19PM -0600, Ian Lepore wrote:
> 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.

I switch to network via loader.conf:
[42]matrix# cat /boot/loader.conf 
# Configure USB OTG; see usb_template(4).
hw.usb.template=3
umodem_load="YES"
# Disable the beastie menu and color
beastie_disable="YES"
loader_color="NO"

currdev="net0"

fdt_overlays="rpi-apa102-matrix.dtbo"
#fdt_overlays="spigen-rpi-b.dtbo"

owc_load="YES"
ow_load="YES"
ow_temp_load="YES"
apa102_load="YES"


I know that it loads the kernel and modules from network, but the
loader, the loader.conf and maybe the dtbo files are from the card.
I couldn't get u-boot to switch to network.
Well - not a major issue.
I used an extra UFS partition for that, but it should have also worked
by placing the files on the msdosfs partition.
I've copyed the whole /boot over to the UFS, but that's more than
required.

-- 
B.Walter <bernd at bwct.de> http://www.bwct.de
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.