Re: Using DMA

Scott Wood wrote:

Bruce_Leonard@selinc.com wrote:

quoted

In the Cafe driver, Linux Device Drivers 3rd Edition, and
DMA-mapping.txt everyone talks about how to allocate buffers using
dma/pci_alloc_coherent(), but no one talks about how to actually use
it. I'm pretty sure (even in my ignorance) that just allocating a DMA
coherent buffer and then copying in and out of it does NOT actually
engage the underlying hardware and perform a DMA transfer.

Does the "adma" stuff address this any?


b.g.
-- 
Bill Gatliff
bgat@billgatliff.com