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CONFIG_BLK_DEV_IDEDMA_PCI: Generic PCI bus-master DMA support

General informations

The Linux kernel configuration item CONFIG_BLK_DEV_IDEDMA_PCI has multiple definitions:

found in drivers/ide/Kconfig

The configuration item CONFIG_BLK_DEV_IDEDMA_PCI:

Help text

(none)

Generic PCI bus-master DMA support found in drivers/ide/Kconfig

The configuration item CONFIG_BLK_DEV_IDEDMA_PCI:

Help text

If your PCI system uses IDE drive(s) (as opposed to SCSI, say) and is capable of bus-master DMA operation (most Pentium PCI systems), you will want to say Y here to reduce CPU overhead. You can then use the "hdparm" utility to enable DMA for drives for which it was not enabled automatically. By default, DMA is not enabled automatically for these drives, but you can change that by saying Y to the following question "Use DMA by default when available". You can get the latest version of the hdparm utility from <ftp://ibiblio.org/pub/Linux/system/hardware/>.

Read the comments at the beginning of drivers/ide/ide-dma.c and the file Documentation/ide.txt for more information.

It is safe to say Y to this question.

Hardware

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