Is there an obvious way to migrate data from the PL into memory that is 
mapped into the address space of the PS?   Ideally I would use 
axi_interconnect as shown 
https://casper-toolflow.readthedocs.io/en/latest/axi4lite_documentation.html

A possible approach is to instantiate axi_dma within the PL , and the PL 
acts as the master during transfers. But the axi_dma exposes a AXI4-Lite 
slave port to the PS so that the PS configures and starts the transfers.   
The receiving raw device would be the memory controller of the PS DDR4.     
(Presumably the data is accessed later by software via the DMA engine).  

Another approach would be to expose a single register, and perform this 
slowly word-by-word (without streaming or bursting.)  

Is this plausible in CASPER,  or are steep changes required?  


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