Support mmconfig PCI config space access
configname: CONFIG_PCI_MMCONFIG
Linux Kernel Configuration
└─>Bus options (PCI etc.)
└─>ACPI (Advanced Configuration and Power Interface) Support
└─>Support mmconfig PCI config space access
In linux kernel since version 2.6.12
Add support for accessing the PCI configuration space as a memory
mapped area. It is the recommended method if the system supports
this (it must have PCI Express and ACPI for it to be available).
In the unlikely case that enabling this configuration option causes
problems, the mechanism can be switched off with the 'pci=nommconf'
command line parameter.
Say N only if you are sure that your platform does not support this
access method or you have problems caused by it.
Say Y otherwise.
mapped area. It is the recommended method if the system supports
this (it must have PCI Express and ACPI for it to be available).
In the unlikely case that enabling this configuration option causes
problems, the mechanism can be switched off with the 'pci=nommconf'
command line parameter.
Say N only if you are sure that your platform does not support this
access method or you have problems caused by it.
Say Y otherwise.