Request for tests: scatter-gather dma support on via686 and emu10k1

[Takashi Iwai <tiwai@suse.de>]

Hi,

i just added the support of scatter-gather (sg) dma support on some chips.
some chips such like via686 and emu10k1 have sg dma function, which
enables to use discontiguous pages as buffer.  hence we'll have almost
no memory allocation problem on these chips.

on via686 and emu10k1, the playback (and capture for via686) buffers
are no longer preallocated but allocated always dynamically
(preallocation doesn't make sense for sg buffers).

on via686 driver, there is a new constraint.  the period byte size
must be in power of two, to make sure that the period is aligned to
the kernel page size.  i don't believe that this matters, though.

there are some other chips with this function, via8233, intel8x0 and
trident.  they will be supported eventually soon.  (the porting must
be easy but i have no hardware :)


anyway, if you have an emu10k1 or via686 soundchip, please test the
latest cvs version of alsa-kernel/alsa-driver.


thanks,

Takashi


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