diff options
Diffstat (limited to 'drivers/net/fddi/Kconfig')
| -rw-r--r-- | drivers/net/fddi/Kconfig | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/net/fddi/Kconfig b/drivers/net/fddi/Kconfig index 3a424c864f4d..ecebeeb9b2a0 100644 --- a/drivers/net/fddi/Kconfig +++ b/drivers/net/fddi/Kconfig @@ -28,17 +28,20 @@ config DEFXX config DEFXX_MMIO bool - prompt "Use MMIO instead of PIO" if PCI || EISA + prompt "Use MMIO instead of IOP" if PCI || EISA depends on DEFXX - default n if PCI || EISA + default n if EISA default y ---help--- This instructs the driver to use EISA or PCI memory-mapped I/O - (MMIO) as appropriate instead of programmed I/O ports (PIO). + (MMIO) as appropriate instead of programmed I/O ports (IOP). Enabling this gives an improvement in processing time in parts - of the driver, but it may cause problems with EISA (DEFEA) - adapters. TURBOchannel does not have the concept of I/O ports, - so MMIO is always used for these (DEFTA) adapters. + of the driver, but it requires a memory window to be configured + for EISA (DEFEA) adapters that may not always be available. + Conversely some PCIe host bridges do not support IOP, so MMIO + may be required to access PCI (DEFPA) adapters on downstream PCI + buses with some systems. TURBOchannel does not have the concept + of I/O ports, so MMIO is always used for these (DEFTA) adapters. If unsure, say N. |