Wednesday, November 19, 2014

[OEL] Warniung: pci_mmcfg_init marking 256MB space uncacheable

Situation:
The following warning appears in the /var/log/messages file:
Warning: pci_mmcfg_init marking 256MB space uncacheable.
Solution:
Modify the grub.conf file with the kernel parameter "acpi_mcfg_max_pci_bus_num=on" and then reboot the server:

#hiddenmenu
title Enterprise Linux Enterprise Linux Server (2.6.32-100.24.1.el5)
root (hd0,0)
kernel /vmlinuz-2.6.32-100.24.1.el5 ro root=/dev/vg00/lv00 console=tty0 acpi_mcfg_max_pci_bus_num=on
initrd /initrd-2.6.32-100.24.1.el5.img