[ECOS] Question on PCI DMA memory

[kevin_lemay@agilent.com]

I have looked through the mailing archives and found several discussions on assigning memory for a bus master PCI device. It appears that we should be using the pci_window memory.

I am attempting to port a driver to ecos. It has the concept of DMA memory which is non-cached or cache coherent memory.

We would ordinarily program the MMU to set up a section of memory to be uncached.

Is the memory defined by pci_window uncached memory? How would I define a large pool of uncached memory (say 8Mb)?

Thanks for any help,

Kevin Lemay

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