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The Linux kernel configuration item CONFIG_BLK_DEV_IDEDMA_PCI
has multiple definitions:
drivers/ide/Kconfig
The configuration item CONFIG_BLK_DEV_IDEDMA_PCI:
(none)
(none)
drivers/ide/Kconfig
The configuration item CONFIG_BLK_DEV_IDEDMA_PCI:
CONFIG_PCI && CONFIG_BLK_DEV_IDEPCI
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.
Raw data from LKDDb:
(none)
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