drivers/hotplug/Config.help

CONFIG_HOTPLUG_PCI
  Say Y here if you have a motherboard with a PCI Hotplug controller.
  This allows you to add and remove PCI cards while the machine is
  powered up and running.  The file system pcihpfs must be mounted
  in order to interact with any PCI Hotplug controllers.

  This code is also available as a module ( = code which can be
  inserted in and removed from the running kernel whenever you want).
  The module will be called pci_hotplug.o. If you want to compile it
  as a module, say M here and read <file:Documentation/modules.txt>.

  When in doubt, say N.

CONFIG_HOTPLUG_PCI_COMPAQ
  Say Y here if you have a motherboard with a Compaq PCI Hotplug
  controller.

  This code is also available as a module ( = code which can be
  inserted in and removed from the running kernel whenever you want).
  The module will be called cpqphp.o. If you want to compile it
  as a module, say M here and read <file:Documentation/modules.txt>.

  When in doubt, say N.

CONFIG_HOTPLUG_PCI_COMPAQ_NVRAM
  Say Y here if you have a Compaq server that has a PCI Hotplug
  controller.  This will allow the PCI Hotplug driver to store the PCI
  system configuration options in NVRAM.

  When in doubt, say N.