The CM4 is plugged into "CM4_WiFi7-PoE" board, please see http://wiki.mcuzone.com/index.php?title=2004_CM4_WiFi7_WiFi6_WLANPi for more information.
Is this the correct way to check the bootloader version? ubuntu@ubuntu:~$ sudo vcgencmd bootloader_version 2023/01/11 17:40:52 version 8ba17717fbcedd4c3b6d4bce7e50c7af4155cba9 (release) timestamp 1673458852 update-time 0 capabilities 0x0000007f ubuntu@ubuntu:~$ ubuntu@ubuntu:~$ sudo vcgencmd version Feb 29 2024 12:24:53 Copyright (c) 2012 Broadcom version f4e2138c2adc8f3a92a3a65939e458f11d7298ba (clean) (release) (start) A few notes: - The manufacturer is able to reproduce the same issue. They have reported that the same issue does not occur if you swap the CM4 with a CM5, but I need to verify this once I obtain a CM5. - The issue does not occur when using Raspberry Pi OS (as noted above) >> I cannot reproduce this locally. For me, PCI devices always show up after a reboot-after-crash. Thanks for trying to reproduce - I can make a remote test environment available if that helps. It occurs ~half the time for us. I've attached some example test runs dmesg outputs (these were done with additional /boot/firmware/cmdline.txt parameters set (pcie_aspm=off as part of an experiment) ** Attachment added: "dmesg output after panic - 10 runs" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2099935/+attachment/5861155/+files/dmesg%20output%20from%2010%20tests.zip -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2099935 Title: PCI initialization failure following kernel panic reboot on Raspberry Pi CM4 Status in linux package in Ubuntu: Invalid Status in linux-raspi package in Ubuntu: Triaged Bug description: Ubuntu Server 24.10 Linux ubuntu 6.11.0-1004-raspi #4-Ubuntu SMP PREEMPT_DYNAMIC Fri Sep 27 22:25:34 UTC 2024 aarch64 aarch64 aarch64 GNU/Linux We're seeing that following a kernel panic and reboot, the PCI fails to initialize correctly and associated devices (such as Wi-Fi card) are not available. Issue Description: • On the first boot, everything works correctly. • However, after a Kernel Panic, the device reboots, but PCIe does not reset or re-initialize properly. • When this happens: o The Wi-Fi card is not recognized. o The lspci command shows no PCI devices. o The dmesg log includes the message: [ 0.591441] brcm-pcie fd500000.pcie: link down • A soft reboot does not fix the issue. • The only way to recover is to completely remove and reconnect power (hard reboot). We have tried modifying /boot/firmware/config.txt and /boot/firmware/cmdline.txt, which has reduced but not fully resolved the issue. How to Reproduce The Problem: 1. Power up the hardware 2. Run ‘lspci’ – observe the result includes the PCI Bridge and Wi-Fi card 3. Trigger a kernel panic with the command ‘echo c | sudo tee /proc/sysrq-trigger’, causing a reboot 4. Run ‘lspci’ – observer the output is now empty The same issue does not occur on Raspberry Pi OS - it seems to be specific to Ubuntu. Any assistance/guidance on how to troubleshoot this would be much appreciated! To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2099935/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
