The RHEL5.3 update to the ahci driver changed the behavior
concerning the Marvell 6121 and 6145 controllers. Previously,
the pata_marvell driver would claim the marvell controller,
but beginning with RHEL5.3, the ahci driver took control of
the Marvell controller to drive the SATA ports. In order to
continue to allow the ahci driver to control the SATA ports,
you must use the ahci module_param "marvell_enable=1".