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slipknotchik
Adventurer
Adventurer
392 Views
Registered: ‎06-25-2016

XDMA question and issue

Hello!

I'm using xdma core in ultrascale+ project. Question is how can I extend window in BARs? I need to extend them to 64 GB window. And I have an issue while writing and reading data frames from PC to board using xdma core via PCIe bus. PCIe driver hangs if size of frame is bigger than 4KB. Why does that happens? In my previius projects with Virtex 7 it was ok with frames bigher than 4KB.

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kurihara
Xilinx Employee
Xilinx Employee
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Registered: ‎07-26-2012

PCIe spec. says as "Requests must not specify an Address/Length combination which causes a Memory Space
access to cross a 4-KB boundary."

 

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slipknotchik
Adventurer
Adventurer
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Registered: ‎06-25-2016

No. This is not about it. If I'm sending frames less than 4K and after reaching totally 4K size of data writing or reading hangs

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