To avoid conflict with bios while handling pci express errors, the pci express aer driver must request the bios for ownership of the pci express aer via the acpi _osc method, as specified in pci. We would like to show you a description here but the site won't allow us. When a broadcom ethernet controller has an error, the system event log (sel) will only report a peripheral component interconnect (pci) error, and it does not point to the ethernet controller.