Date: Fri, 12 May 2023 18:09:49 +0200 From: Emmanuel Vadot <manu@bidouilliste.com> To: Doug Rabson <dfr@rabson.org> Cc: freebsd-arm@freebsd.org Subject: Re: Raspberry Pi POE+ hat overlay Message-ID: <20230512180949.5ea314b166e0b9975eeb0535@bidouilliste.com> In-Reply-To: <CACA0VUh9-7o55pXcyn=Ep9mPexAkgjKLEKUh6HqMovTxe2_R0Q@mail.gmail.com> References: <CACA0VUh9-7o55pXcyn=Ep9mPexAkgjKLEKUh6HqMovTxe2_R0Q@mail.gmail.com>
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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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