DMA take 2

[Charles Krinke]

Let me try my DMA question a bit more concisely to the linuxppc group.
 
I am working on a DMA routine for the 8541 and the status register ends up with the CB (ChannelBusy) bit set, which I suspect is a programming error on my part.
 
So, the question is:
 
"What are the common programming errors that lead to SR0[CB] set at the end of a DMA transaction in an 8541?"
 
Charles