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CONFIG_RESERVE_DMA_COHERENT: Reserve DMA coherent memory

General informations

The Linux kernel configuration item CONFIG_RESERVE_DMA_COHERENT:

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.



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