Issue Description:
When booting OpenWrt 24.10 x86-64 (kernel 6.6.83), the system stops after PCI and ACPI initialization without mounting the root filesystem. The log shows no errors but also lacks messages like VFS: Mounting root.
Openwrt 23.05 works correctly.
Configuration:
Boot Log Highlights:
- Kernel starts, detects CPU, memory, and PCI devices (including NVMe controller).
- ACPI initializes, but all IRQ links are disabled:
ACPI: PCI: Interrupt link LNKA disabled
...
ACPI: PCI: Interrupt link LNKH disabled
- No messages about root FS mounting attempts or NVMe errors.
Booting OpenWrt log
Looks like there are some patches related to this chipset for yocto here: https://github.com/ADLINK/meta-adlink-x86-64bit/blob/scarthgap/recipes-kernel/linux-intel/linux-intel/0001-Avoid-ACPI-probe-due-to-resource-conflict-with-BIOS.patch I've seen similar issues booting 24.10 kernels on an AD-LINK LEC-AL-E3940 which is the same Atom processor. I've also seen issues on the debian 6.12 / trixie kernel but not 6.1 / bookworm. Suggests the problem is not OpenWRT specific
Added this patch to package/kernel/linux/patches, but it didn't help.
My device needs CONFIG_PCI_MMCONFIG=y kernel configuration to boot on kernel 6.6, which was not needed on kernel 6.1. Please try following patch.
--- a/target/linux/x86/64/config-6.6
+++ b/target/linux/x86/64/config-6.6
@@ -345,6 +345,7 @@ CONFIG_MFD_CORE=y
# CONFIG_MFD_INTEL_LPSS_ACPI is not set
# CONFIG_MFD_INTEL_PMC_BXT is not set
CONFIG_MMC=y
+CONFIG_MMCONF_FAM10H=y
CONFIG_MMC_BLOCK=y
CONFIG_MMC_CQHCI=y
CONFIG_MMC_RICOH_MMC=y
@@ -404,7 +405,7 @@ CONFIG_PCIEPORTBUS=y
CONFIG_PCIE_PME=y
CONFIG_PCI_HYPERV=y
CONFIG_PCI_HYPERV_INTERFACE=y
-# CONFIG_PCI_MMCONFIG is not set
+CONFIG_PCI_MMCONFIG=y
CONFIG_PCI_PASID=y
CONFIG_PCI_PRI=y
CONFIG_PCI_XEN=y
1 Like
The patch didn't work, but I made the changes manually and the board booted up. Thanks a lot!