Once upon a time, Stefan Wahren <stefan.wahren@xxxxxxxx> said: > Hi Chris, > > Am 02.03.22 um 10:51 schrieb Peter Robinson: > >> I have an RPi4 running Fedora 35. It hadn't been updated in a while, so > >> I applied updates today. When I boot to the kernel 5.16.11-200, I lose > >> the PPS device from my GPS hat. Boot back to 5.14.16-301.fc35 and it > >> works. > >> > >> I'm booting with EFI firmware, and with a device tree config.txt that > > All our firmware are EFI, that's the only way we support booting, is > > it the default U-Boot based one or are you using the edk2 one? > > > >> has "dtoverlay=pps-gpio,gpiopin=4" in it. I removed the /boot/dtb > >> symlink and set /etc/u-boot.conf to not re-add it. > >> > >> When I boot 5.16, I see /proc/device-tree, and it has > >> /proc/device-tree/pps@4 in it (and the contents look correct), but > >> loading the pps-gpio kernel module just gives: > >> > >> pps-gpio: probe of pps@4 failed with error -22 > > Any chance you can tell us which kernel it started with, 5.14.x to > > 5.16.x is a big window to debug and looking at kernel logs for > > drivers/pps there's been no changes in that space in the 5.15+ kernels > > at all. > > > > I wonder if it's a change/regression in the firmware overlay <-> > > kernel interface. > > do you use the DTB file from 5.14.x or 5.16x? > > I guess this is related to this commit: > > https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.16.y&id=266423e60ea1b953fcc0cd97f3dad85857e434d1 > > Unfortunately this is a change which requires this DTS fix: > > https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.16.y&id=c8013355ead68dce152cf426686f8a5f80d88b40 > > So DTB and kernel must "match". Okay, so what's the best way to do that? I have EFI firmware from https://github.com/pftf/RPi4 in /boot/efi, and the /boot/dtb symlink removed. The bcm2711-rpi-4-b.dtb file in /boot/efi is from the RPi4_UEFI_Firmware_v1.32.zip file. I have a config.txt in /boot/efi that references overlays in /boot/efi/overlays from RPM bcm283x-overlays (like pps-gpio).. I'm not quite sure how I need to fit all this together. -- Chris Adams <linux@xxxxxxxxxxx> _______________________________________________ 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
