Honored Contributor
Honored ContributorI just need to change the BAR size from 256MB down to 128MB ... for some reason the configuration space works but the two BAR's in the sample with the
Arria V starter kit return a status of UR ( unsupported request ) , when I try to read internal memory or DMA status registers that are accessed vie the BAR's I am in the middle of probing the chipselect decoded by the PCIe mega function to see if the internal memory or DMA slaves are even getting selected which I suspect they are not. My other approach is to get the simulation up that I also need to do . The PCIe probe and analyzer ( LeCroy ) indicates the MemRD is going out to the correct address but we get a completion with no data and status of UR. Is there any config status that would indicate the reason for the UR status ? Also, when I tried to move the address from 0x0800_0000 to 0x1000_0000 for the internal memory address map in the design, the BAR registers somehow automatically changed to A(31..29) from A(31.. 28) ... since writing 0xFFFF_FFFF returns 0xE000_0000 when it previously returned 0xF000_0000 from the BAR's indicating size ... Any ideas appreciates.
