On Thu, 2006-03-23 at 08:39 +1100, Benjamin Herrenschmidt wrote:

> > Ok that's what I figured. Well, it has to change if I shall be able to
> > write a driver for the digital output of above chip.
> 
> Well, you can be sneaky in the meantime :) If you use small buffers and
> large dbdma command lists, you can have the dbdma command list skip the
> status data but that mean one output command per sample (or packet),
> fairly horribly inefficient if your ratio data/status is not high :)

I don't think so, since the user/channel status bits are interleaved
*bitwise* :)

Though there's another thing I don't yet understand. If you look at the
three datasheets of the topaz chips, you'll notice that one of them is a
receiver, one of them a transmitter, and the third a transceiver! Now I
really wonder wtf apple is doing with them.
But to find out that, I first need to write a topaz module that probes
which one of the chips it is :)

johannes