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CONFIG_SH_PCIDMA_NONCOHERENT: Cache and PCI noncoherent

General informations

The Linux kernel configuration item CONFIG_SH_PCIDMA_NONCOHERENT has multiple definitions:

Cache and PCI noncoherent found in arch/sh/Kconfig

The configuration item CONFIG_SH_PCIDMA_NONCOHERENT:

Help text

Enable this option if your platform does not have a CPU cache which remains coherent with PCI DMA. It is safest to say 'Y', although you will see better performance if you can say 'N', because the PCI DMA code will not have to flush the CPU's caches. If you have a PCI host bridge integrated with your SH CPU, refer carefully to the chip specs to see if you can say 'N' here. Otherwise, leave it as 'Y'.

Cache and PCI noncoherent found in arch/sh/drivers/pci/Kconfig

The configuration item CONFIG_SH_PCIDMA_NONCOHERENT:

Help text

Enable this option if your platform does not have a CPU cache which remains coherent with PCI DMA. It is safest to say 'Y', although you will see better performance if you can say 'N', because the PCI DMA code will not have to flush the CPU's caches. If you have a PCI host bridge integrated with your SH CPU, refer carefully to the chip specs to see if you can say 'N' here. Otherwise, leave it as 'Y'.

Cache and PCI noncoherent found in arch/sh64/Kconfig

The configuration item CONFIG_SH_PCIDMA_NONCOHERENT:

Help text

Enable this option if your platform does not have a CPU cache which remains coherent with PCI DMA. It is safest to say 'Y', although you will see better performance if you can say 'N', because the PCI DMA code will not have to flush the CPU's caches. If you have a PCI host bridge integrated with your SH CPU, refer carefully to the chip specs to see if you can say 'N' here. Otherwise, leave it as 'Y'.

Hardware

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