Date: Fri, 12 May 2023 17:18:53 +0100 From: Doug Rabson <dfr@rabson.org> To: Emmanuel Vadot <manu@bidouilliste.com> Cc: freebsd-arm@freebsd.org Subject: Re: Raspberry Pi POE+ hat overlay Message-ID: <CACA0VUjSf=o29Zo5f2MpKO4M%2B5=avf=bhNoSStzTEyumy%2BPJrw@mail.gmail.com> In-Reply-To: <20230512180949.5ea314b166e0b9975eeb0535@bidouilliste.com> References: <CACA0VUh9-7o55pXcyn=Ep9mPexAkgjKLEKUh6HqMovTxe2_R0Q@mail.gmail.com> <20230512180949.5ea314b166e0b9975eeb0535@bidouilliste.com>
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Yes - I copied it from a random Linux distro I had lying around:
$ ls /boot/msdos/overlays
disable-bt.dtbo mmc.dtbo pwm.dtbo rpi-poe-plus.dtbo
I'm wondering if it's something to so with the compatible settings on the
overlay. Disassembling it with dtc looks like this:
/dts-v1/;
/ {
compatible = "brcm,bcm2835";
fragment@0 {
target-path = "/";
__overlay__ {
pwm-fan {
compatible = "pwm-fan";
cooling-levels = <0x0 0x20 0x40 0x80 0xff>;
#cooling-cells = <0x2>;
pwms = <0x1 0x0 0x13880>;
phandle = <0x3>;
};
};
};
...
On Fri, 12 May 2023 at 17:09, Emmanuel Vadot <manu@bidouilliste.com> wrote:
> On Fri, 12 May 2023 16:43:55 +0100
> Doug Rabson <dfr@rabson.org> wrote:
>
> > I have a pi4 with the official POE+ hat which I want to run FreeBSD on.
> One
> > thing I noticed is that the fan doesn't run in FreeBSD so I decided to
> try
> > and write a little driver for it. First step seems to be to load the
> > corresponding devicetree overlay by adding something like this to
> > /boot/msdos/config.txt:
> >
> > dtoverlay=rpi-poe-plus
> > dtparam=poe_fan_temp0=45000,dtparam=poe_fan_temp0_hyst=3000
> > dtparam=poe_fan_temp1=50000,dtparam=poe_fan_temp1_hyst=3000
> > dtparam=poe_fan_temp2=62000,dtparam=poe_fan_temp2_hyst=4000
> > dtparam=poe_fan_temp3=70000,dtparam=poe_fan_temp3_hyst=5000
> >
> > Unfortunately this is where I'm stuck - the overlay is not present in the
> > final DTB given to the kernel so there isn't anything to hook a driver
> to.
> > Are dtoverlays supposed to work on FreeBSD?
>
> DT Overlays works fine, the process of them on RPI is:
>
> - Firmware loads the DTB
> - Parse the config.txt and load/apply the overlays
> - The DTB is passed to u-boot which in turn pass it to loader/kernel
>
> Stupid question but did you copy the rpi-poe-plus.dtbo on the fat
> partition ?
>
> --
> Emmanuel Vadot <manu@bidouilliste.com> <manu@freebsd.org>
>
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<div dir=3D"ltr">Yes - I copied it from a random Linux distro I had lying a=
round:<div><br></div><div>$ ls /boot/msdos/overlays<br>disable-bt.dtbo =C2=
=A0 mmc.dtbo =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pwm.dtbo =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0rpi-poe-plus.dtbo<br></div><div><br></div><div>I'm won=
dering if it's something to so with the compatible settings on the over=
lay. Disassembling it with dtc looks like this:</div><div><br></div><div>/d=
ts-v1/;<br><br>/ =C2=A0{<br><br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 compatible =3D =
"brcm,bcm2835";<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 fragment@0 {<br><b=
r>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 target-path =3D &=
quot;/";<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 __=
overlay__ {<br><br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 pwm-fan {<br><br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 compatible =3D "pwm-fan";<br>=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 cooling-levels =3D <0x0 0x20 0x40 0x80 0xff>;<br>=C2=A0=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 #cooling-cells =3D <0x2>;<br>=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 pwms =3D <0x1 0x0 0x13880>;<br>=C2=A0=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 phandle =3D <0x3>;<br>=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 };<br=
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 };<br>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 };<br></div><div>...</div></div><br><div class=3D"gmail_q=
uote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, 12 May 2023 at 17:09, E=
mmanuel Vadot <<a href=3D"mailto:manu@bidouilliste.com">manu@bidouillist=
e.com</a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"ma=
rgin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border=
-left-color:rgb(204,204,204);padding-left:1ex">On Fri, 12 May 2023 16:43:55=
+0100<br>
Doug Rabson <<a href=3D"mailto:dfr@rabson.org" target=3D"_blank">dfr@rab=
son.org</a>> wrote:<br>
<br>
> I have a pi4 with the official POE+ hat which I want to run FreeBSD on=
. One<br>
> thing I noticed is that the fan doesn't run in FreeBSD so I decide=
d to try<br>
> and write a little driver for it. First step seems to be to load the<b=
r>
> corresponding devicetree overlay by adding something like this to<br>
> /boot/msdos/config.txt:<br>
> <br>
> dtoverlay=3Drpi-poe-plus<br>
> dtparam=3Dpoe_fan_temp0=3D45000,dtparam=3Dpoe_fan_temp0_hyst=3D3000<br=
>
> dtparam=3Dpoe_fan_temp1=3D50000,dtparam=3Dpoe_fan_temp1_hyst=3D3000<br=
>
> dtparam=3Dpoe_fan_temp2=3D62000,dtparam=3Dpoe_fan_temp2_hyst=3D4000<br=
>
> dtparam=3Dpoe_fan_temp3=3D70000,dtparam=3Dpoe_fan_temp3_hyst=3D5000<br=
>
> <br>
> Unfortunately this is where I'm stuck - the overlay is not present=
in the<br>
> final DTB given to the kernel so there isn't anything to hook a dr=
iver to.<br>
> Are dtoverlays supposed to work on FreeBSD?<br>
<br>
DT Overlays works fine, the process of them on RPI is:<br>
<br>
=C2=A0- Firmware loads the DTB<br>
=C2=A0- Parse the config.txt and load/apply the overlays<br>
=C2=A0- The DTB is passed to u-boot which in turn pass it to loader/kernel<=
br>
<br>
=C2=A0Stupid question but did you copy the rpi-poe-plus.dtbo on the fat<br>
partition ?<br>
<br>
-- <br>
Emmanuel Vadot <<a href=3D"mailto:manu@bidouilliste.com" target=3D"_blan=
k">manu@bidouilliste.com</a>> <<a href=3D"mailto:manu@freebsd.org" ta=
rget=3D"_blank">manu@freebsd.org</a>><br>
</blockquote></div>
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