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Visitor grimmg
Visitor
247 Views
Registered: ‎07-03-2018

No RX_STATUS_EOP status flag for C2H streaming transfers

We use an own adapted driver based on XILINX xdma driver version 20180420. The driver buffer is organized as an ring buffer (driver works in a cyclic mode) and use interrupts at the end of a descriptor to check write back status from DMA engine.

For the first cycle we get the expected RX_STATUS_EOP status flag on write back address. After the first cycle we get no further RX_STATUS_EOP status flag.

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Xilinx Employee
Xilinx Employee
174 Views
Registered: ‎08-06-2008

Re: No RX_STATUS_EOP status flag for C2H streaming transfers

Have you run the default example design with Xilinx driver? Do you see the same issue? Have you checked the status of tlast? Have you checked the dmesg log and see if it reports EOP packet or not? The following document has some tips for debugging XDMA issues.

https://www.xilinx.com/Attachment/Xilinx_Answer_71435_XDMA_Debug_Guide.pdf

Please check and let us know the results of your investigation.

Thanks.

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