CDDA playback on Pismo (and other newer models)

[Iain Sandoe]

[...]
>>From the the drive's spin-up sounds it seems to always be in
>>high-speed mode, but unlike the ATAPI driver, there is little
>>head movement noise.
>
> I think the problem is more with cdparanoia. I think it's more or less
> synchronous, it doesn't have a thread that collects datas while another
> outputs sounds. I've looked at cdparanoia sources some time ago, and I
> think and intermediate step of buffering is necessary.

>From my IRQ latency measurements I would think that there was *no* chance
without the intermediate step.  On my Lombard, CD access over IDE can mask
IRQs for 2 >>ms<<<  which also means you need to make sure the audio frag
sizes are sensible as well... i.e. don't try 2 frags of 256 bytes - it won't
work as things stand.

Iain.

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