[wdmaudiodev] RevokeMapping
- From: Marc Sillinger <marctiti@xxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Wed, 2 Jul 2003 16:33:24 +0200 (CEST)
Hi,
this should be an easy question for most of you :
I wonder what happens on AC'97, when RevokeMappings is
called with a tag that matches the current buffer
(CIV). From what I've seen, after the ICH is reset,
CIV = LVI = 0. Hence, the Buffer Descriptor list is
rearranged so that the current buffer data is located
at index 0. Now, I believe the PICB is reset too, so
what happens when DMA is resumed ? does the ICH replay
a part of the current mapping, or how did the current
position get saved ?
Or does portcls prevent the cancellation of the
current mapping ?
thanks
Marc.
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