hi: 2010/9/6 Mulyadi Santosa <mulyadi.santosa@xxxxxxxxx>: > 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. I will and thanks for your kind help. BTW, I know it is the not question meet the topic. Why I use kgdb for debugging, I cannot p/x para1, the content of para1 cannot be seem from gdb console. But some global variable can be seen by gdb. I google this proble and it say I need to make sure some "frame options" should be included while compiling the kernel. I follow the instructions but I still cannot see the value of the parameter. did I miss something or is it originally impossible to see the value in kernel. Appreciate your kind and selfless help, miloody > 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
