CONFIG_RESERVE_DMA_COHERENT: Reserve DMA coherent memory

General informations

The Linux kernel configuration item CONFIG_RESERVE_DMA_COHERENT:

• prompt: Reserve DMA coherent memory
• type: bool
• depends on: CONFIG_PCI && ! CONFIG_MMU
• defined in arch/frv/Kconfig
• found in Linux kernels: 2.6.11–2.6.39, 3.0–3.19, 4.0–4.16

Help text

Many PCI drivers require access to uncached memory for DMA device communications (such as is done with some Ethernet buffer rings). If a fully featured MMU is available, this can be done through page table settings, but if not, a region has to be set aside and marked with a special DAMPR register.

Setting this option causes uClinux to set aside a portion of the available memory for use in this manner. The memory will then be unavailable for normal kernel use.

Hardware

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Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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