I have used ml403 reference board recently, and now I am porting the
opb_ethernet driver downloaded from the net onto the board. I use the EDK9.1
developing environment, and the driver files like "xemac.c" are copied from the
EDK drivers lib. My opb_ethernet driver can work in the "No DMA mode", but the
speed of FIFO is too slow to transport big files. So I transfer to "Simple DMA
mode". I configured the hardware IP core in the EDK, in details, I only changed
the DMA mode of opb_ethernet IP core to "Simple DMA", and then synthesize the
hardware again. After that I recompile the kernel of the new xparameters.h
file. But when I ping the board, in the Recv ISR function, the result of DMA
operation from Recv FIFO to kernel memory is always "DMA timed out". I checked
the pdf of opb_ethernet and the ipif, but I can't find any problem, especially
the manner of DMA. I can only guess that there are some problems in the
hardware configuration, so who can help me about that problem?
Thank you very much.
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