This bug has been copied from bug #560540 and has been proposed to be backported to 5.5 z-stream (EUS).
in kernel 2.6.18-194.19.1.el5 linux-2.6-pnp-ignore-both-unset-and-disabled-ioresources.patch linux-2.6-pnp-reserve-system-board-iomem-and-ioport-resources.patch
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2010-0839.html
Technical note added. If any revisions are required, please edit the "Technical Notes" field accordingly. All revisions will be proofread by the Engineering Content Services team. New Contents: Previously, system board iomem resources, which were enumerated using the PNP Motherboard resource descriptions, were not recognized and taken into consideration when gathering resource information. This could have caused MMIO-based requests to receive allocations that were not valid. With this update, system board iomem resources are correctly recognized when gathering resource information.