Hi... On Sun, Sep 5, 2010 at 22:56, loody <miloody@xxxxxxxxx> wrote: > thanks for your explanation, btw I saw the document you wrote on full circle. > It's GREAT~~ Thanks...don't hesitate to criticize it if you found any weaknesses... I am not that good when it comes to memory management. > There 5 Dmas on my embedded system and I try to implement the Kernel > Api for them to use. > But I have no idea what are they used for ? > after reading the dma-api.txt. > 1. It seems some function used for memory coherent, other are no, such us > :) > 2. "dma map ops " I have no idea what it is used for? I have grep the > src, and it seems only x86 implement it. > appreciate your help, Now that makes me a bit dizzy too. So, looking at your case here, there is a chance it's not named "DMA", but something else but still represent same thing: head-to-head data transfer without CPU intervention (only at operation setup, I guess). You really need to consult to embedded guys on more focused mailing list. NB: dma ops...I think it's a struct that represents common DMA operation such as read, write and so on (scatter gather? is it possible in DMA?)...or perhaps I/O mapping too. -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
