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How to support DMA in an eCos driver


Hi,evrybody

I am have a question:

i write a driver for a PCI device,and must support DMA,

but i cannot find any document which introduce this.

Can anybody tell me how to allocate the shared memory

for DMA,and how to get the physical address of a allocated

memory,or how to carry out DMA ?

thanks a lot~!
	

Sincerely yours,
Tian-Jun
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