Modifying QSys PCIe reference design to have dual port OCM

I'm not sure about the size that you are sending, but in general, if the data size is not aligned to..I think 64bitx16, the DMA won't work correctly.

You just need to open the setting of mSGDMA. I think the PCIe interface is 64bit, so you just need to check the burst length. It has to be exact length in that design. If you want to send much smaller data, change the setting of the mSGDMA, so you can send whatever size you want.

The other thing I can think of is accessing same address of the OCM? if so, use 2 pgaes of location.

For example, page0 start from offset address of 0x0000 - 0x7FFF

page1 start from offset address of 0x8000 - 0xFFFF

external port uses like

page0, page1, page0, page1

whereas PCIe or mSGDMA should read

page1, page0, page1, page0

to avoid conflict.