drivers/ntb/hw/idt/Kconfig

   1 config NTB_IDT
   2         tristate "IDT PCIe-switch Non-Transparent Bridge support"
   3         depends on PCI
   4         help
   5          This driver supports NTB of cappable IDT PCIe-switches.
   6
   7          Some of the pre-initializations must be made before IDT PCIe-switch
   8          exposes it NT-functions correctly. It should be done by either proper
   9          initialisation of EEPROM connected to master smbus of the switch or
  10          by BIOS using slave-SMBus interface changing corresponding registers
  11          value. Evidently it must be done before PCI bus enumeration is
  12          finished in Linux kernel.
  13
  14          First of all partitions must be activated and properly assigned to all
  15          the ports with NT-functions intended to be activated (see SWPARTxCTL
  16          and SWPORTxCTL registers). Then all NT-function BARs must be enabled
  17          with chosen valid aperture. For memory windows related BARs the
  18          aperture settings shall determine the maximum size of memory windows
  19          accepted by a BAR. Note that BAR0 must map PCI configuration space
  20          registers.
  21
  22          It's worth to note, that since a part of this driver relies on the
  23          BAR settings of peer NT-functions, the BAR setups can't be done over
  24          kernel PCI fixups. That's why the alternative pre-initialization
  25          techniques like BIOS using SMBus interface or EEPROM should be
  26          utilized. Additionally if one needs to have temperature sensor
  27          information printed to system log, the corresponding registers must
  28          be initialized within BIOS/EEPROM as well.
  29
  30          If unsure, say N.
  31