[linux-dvb] Re: DVB-CI question

[Andrew de Quincey <adq_dvb@lidskialf.net>]

On Friday 26 March 2004 18:45, Ralph Metzler wrote:
> Andrew de Quincey writes:
>  > Sure, thats what I was intending to do. However, I need to finish it
>  > first in line with these new ideas (I've kept the old code though, but
>  > that does not work as I was still debugging it).
>  >
>  > > I'd like to hear Ralph's or Marcus's opinion, as they originally
>  > > wrote the CI code in the av7110 firmware and driver, and I think
>  > > they know a good deal more about that stuff than I do.
>  >
>  > Yep, absolutely. I mean, I'm not trying to "get out" of writing the
>  > defragmentation code; I just don't see the need for it in-kernel.
>
> AFAIR, the reason for handling the defragmentation in the firmware was
> that we thought that the overhead of exchanging messages with the
> kernel driver for each 128 byte packet (or whatever CI driver and
> module settle on) is too much, especially when recording at the same
> time. Of course one can transfer more packets at once, but then one
> can also already defragment them ...

I suspected this might be the case.

> For other hardware this can of course be handled in user space.
> If you keep the interfaces between layers general enough it should
> also be no problem to support drivers with other interfaces (like the
> av7110 cards or also the Twinhan cards with even higher level interface)
> with the same code.

Yup, should be. Out of interest, what level do the Twinhan cards operate at?


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