Troubleshooting • Re: PoE HAT not working when using buildroot image

I'd like to add my interest in having an answer to this question. I've run into the same issue with my custom OS. What I've done:

I've added `dtoverlay=rpi-poe-plus` to a config file referenced by `/config.txt` with `/overlay/rpi-poe-plus.dtbo` existing. The overlay gets loaded, at least according to `vcdbg log msg`:

007633.140: brfs: File read: /mfs/sd/config/poe-settings.txt
007989.257: brfs: File read: /mfs/sd/overlays/rpi-poe-plus.dtbo
008040.263: Loaded overlay 'rpi-poe-plus'

Then I'm loading the following modules:

pwm_raspberrypi_poe, rpi_poe_power, simple_mfd_i2c and regmap_i2c

The pwm and rpi power modules are unused for reasons I don't understand:

rpi_poe_power 12288 0 - Live 0xffffffe14b690000
pwm_raspberrypi_poe 12288 0 - Live 0xffffffe14b687000

I expect a cooling device in /sys/class/thermal, but I only see `thermal_zone0`. It is probably as simple as adding a module I've overlooked, but after 3 hours of searching I figured it might be worth adding to this post. Help would be appreciated.

$ uname -a
Linux info-beamer 6.6.28-v8+ #1758 SMP PREEMPT Fri Apr 19 10:39:00 BST 2024 aarch64 GNU/Linux

$ vcgencmd version
Apr 17 2024 17:27:09
Copyright (c) 2012 Broadcom
version 86ccc427f35fdc604edc511881cdf579df945fb4 (clean) (release) (start)

$ grep Model /proc/cpuinfo
Model : Raspberry Pi 4 Model B Rev 1.5

Statistics: Posted by dividuum — Mon May 06, 2024 2:18 pm

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