Using DMA

[Bill Gatliff]

Scott Wood wrote:
> Bruce_Leonard at selinc.com wrote:
>> 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 at billgatliff.com