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Master Abort.

Hi .

I am using a card with a MPC860 connected with a Qspan that is connected
with a 21554.
When I try to do a DMA access to a memory on a card behind the 21554 it
doesn't work and
the Qspan tells me he has done a Master Abort.

What's happening ?

What is the signification of a master abort ?

In wich bus is the problem ( bus MPC860, local PCI bus on Qspan, PCI bus
behind 21554 ) ?

Thanks

Chris