I don't know if SBUS<->SBUS DMA actually works, there are some bits
for it but have never tried, but PCI<->other PCI should definitely
work.
SBUS<-->SBUS on the same segment works, I've tried it.
One thing which probably does not work is PCI<-->PCI on the same PCI
controller yet different PBM segments, at least sun PCI docs describe
it this way. It seems the PCI controller cannot handle if it sends
out a transaction to the system bus which is addressed back to itself.
Later,
David S. Miller
davem@redhat.com
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