Fedora Arm Community - Ben Herrick and I exchanged several messages about Fedora 36 and Fedora 35. I was successful in getting the POE Hat fan to work with Fedora 36 (beta) using a couple of the steps as outlined in the Fedora wiki for RPI Hats but was not as successful with Fedora 35. I suspect it should work as long as current firmware files are used (e.g. start4.elf) but in my very limited testing with FC35, I could not get the board to boot and I was too lazy to pull the headless board from the rack to plug a monitor and keyboard to see where the boot was stalling. My original process involving a custom upstream device tree to integrate with the POE Hat fan device driver still works fine for FC35 and FC34. For Fedora 36 (beta) I found that if I followed the steps in the wiki to load the firmware device tree (rm /boot/dtb and set FirmwareDT=true in /etc/u-boot.conf) then the POE Hat fan would just work as long as I also made sure the upstream_kernel=1 option in config.txt was commented out. I did not need to add the rpi-poe or i2c dtoverlay lines to config.txt. This process worked on 3 RPi4 boards that were updated from FC35 using dnf system upgrade and which use u-boot. A fourth RPi4 using UEFI was also updated to FC36 beta with upstream_kernel=1 commented out and the POE Hat fan also worked without any additional configuration. All 4 boards are 8 GB and all 4 POE Hats are the original model. The device tree can be inspected at /proc/device-tree and will show a directory called pwm-fan which is the hook needed for the upstream fan device driver. lsmod can be used to display the presence of the pwm_raspberrypi_poe device driver that makes all of this happen as long as the linux kernel is 5.13 or newer (if i recall correctly). Glad to answer any questions. regards Brad On Mon, Apr 18, 2022 at 7:15 AM Ben Herrick <intrep@xxxxxxxxxx> wrote: > > Fedora ARM mailing list, > > I've been trying to get the fan on my Raspberry Pi PoE HAT working with Fedora 35 and 36 Beta. I'm using the aarch64 raw image. > > I came across the instructions on the wiki page here: https://fedoraproject.org/wiki/Architectures/ARM/Raspberry_Pi/HATs#PoE_Hat > > Unfortunately, the line in config.txt from the wiki didn't work for me. > > The lines that did work on Fedora 36 Beta for aarch64 are below: > > dtoverlay=i2c > dtoverlay=pwm-raspberrypi-poe > > I'm also able to set the fan parameters with the below: > > dtparam=poe_fan_temp0=70000,poe_fan_temp0_hyst=10000 > dtparam=poe_fan_temp1=60000,poe_fan_temp1_hyst=10000 > dtparam=poe_fan_temp2=50000,poe_fan_temp2_hyst=10000 > dtparam=poe_fan_temp3=40000,poe_fan_temp3_hyst=10000 > > Note that these same lines didn't work for me on Fedora 35 aarch64. > > I'm hoping others can replicate my experience and the wiki can be updated to help others. > > Please let me know if you have any questions or concerns. > > -Ben Herrick > > _______________________________________________ > arm mailing list -- arm@xxxxxxxxxxxxxxxxxxxxxxx > To unsubscribe send an email to arm-leave@xxxxxxxxxxxxxxxxxxxxxxx > Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: https://lists.fedoraproject.org/archives/list/arm@xxxxxxxxxxxxxxxxxxxxxxx > Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure _______________________________________________ arm mailing list -- arm@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to arm-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/arm@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
