Re: Sound stoppage: TRIAL code to re-start DEAD dma

Paul experienced some problems with the DEC ethernet controller of his old
PowerBook 3400 for example. It may be useful to flush the dbdma command buffer
after modifying and invalidate it before it gets modified by the controller...

OK, that's not too difficult - we get a chance to do this before the cmd
block is queued on TX... and after we read the data on RX.

(although we don't *seem* to be seeing a coherency problem here - the
xfer_status is {AFAICT} getting updated properly for dmasound).

I'll figure it into the next lot of changes.

Iain.

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