MPC8548 PCI Burst issue

I have an issue with a 8548 while I memcpy a block from DDR over a Tundra-60X bridge.
I have been told by FS that the best way in my case is to use the DMA for DDR to PCI transfer.

I can't find any reference or API for this implementation. May someone points me on the right documentation or API.
My board looks like a CDS.

Thanks for any info.

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