Re: [Xenomai-help] RTDM mmap alternative

[Jan Kiszka <jan.kiszka@domain.hid>]

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Rodrigo Rosenfeld Rosas wrote:
> Hi Jan, I'm back on this discussion.
> 
> At the time I asked you, you told me to do the mmap on driver
> initialization.
> 
> But now, I realized that, since I'll be using RTDM, how could I use
> mmap from RTDM, even if in a non RT-context?

Which mapping step are you now referring to, the one to get the large
physical DMA area inside the kernel address space or the one to map
kernel addresses to user space? Already checked the related LDD3 chapter
for this?

> 
> I'm a bit confusing...
> 
> What would be others alternatives for avoid copying the video frames
> in a RTDM driver?

Either map or copy, there is no third way. The point is just which
mapping functions to use and when.

Jan


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