Hi, On Wed, Jan 15, 2014 at 11:45 PM, m silverstri <michael.j.silverstri@xxxxxxxxx> wrote: > Hi, > > If my application allocate memory for input and output buffers, and > pass the pointer to a kernel driver (via v4l2 queue buffer operation), > can the kernel driver access it? Do I need to setup DMA before teh > kernel driver can read/write to it? > If your application is allocating memory for v4l2 buffers how are you making sure its contiguous ? What call are you using to allocate memory @application level ? If the application is allocating buffers its USER_PTR buffer. Yes kernel can access the buffer. For reading and writing of buffers you dont need to setup DMA. Regards, --Prabhakar Lad http://in.linkedin.com/in/prabhakarlad _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
