From: Sergei Shtylyov Sent: Sunday, March 22, 2009 4:43 PM > > Hello. > > Subbrathnam, Swaminathan wrote: > > > CPPI4.1 is an evolution over CPPI3.0. > > I would call the 3.0-to-4.1 changes rather revolutionary, than > evolutionary... > > > As I see it the following features evolved compared to 3.0 > > > > 1. List management functions are handled by the DMA engine in 4.1 compared > > to 3.0 > were the SW (driver) managed the same. > > > > True, descriptor queues are handled by the queue manager now. > > > 2. New performance modes (Generic RNDIS) got introduced. > > > > Those new modes don't have anything to do with CPPI 4.1 itself -- > they're part of USB XFER DMA. I think TI could well have kept using CPPI > 3.0 and just added the new modes... > > > Beyond that the general processing of the DMA descriptors and functionality > > are > very similar between CPPI3.0 and 4.1. > > > > There's nothing similar in the descriptor formats, there was no DMA > controller, and neither queue nor buffer managers in CPPI 3.0.
DMA scheduler should be a configure once and leave. You should not need to use buffer manager as well. I am not sure if it is even supported on DA830. Thanks, Sekhar _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
