Kconfig 1.3 KB

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  1. config NTB_IDT
  2. tristate "IDT PCIe-switch Non-Transparent Bridge support"
  3. depends on PCI
  4. select HWMON
  5. help
  6. This driver supports NTB of cappable IDT PCIe-switches.
  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. First of all partitions must be activated and properly assigned to all
  14. the ports with NT-functions intended to be activated (see SWPARTxCTL
  15. and SWPORTxCTL registers). Then all NT-function BARs must be enabled
  16. with chosen valid aperture. For memory windows related BARs the
  17. aperture settings shall determine the maximum size of memory windows
  18. accepted by a BAR. Note that BAR0 must map PCI configuration space
  19. registers.
  20. It's worth to note, that since a part of this driver relies on the
  21. BAR settings of peer NT-functions, the BAR setups can't be done over
  22. kernel PCI fixups. That's why the alternative pre-initialization
  23. techniques like BIOS using SMBus interface or EEPROM should be
  24. utilized.
  25. If unsure, say N.