We are using MinnowBoard as a reference and Minnow UEFI as a firmware for one of our custom board.
We have a PCIe-PCI bridge connected to PCIe port 1 [00|18|00] of Atom E6xx. On the other side of PCIe to PCI bridge, we have a FPGA device which identifies itself as a PCI device using a IP core.
During EFI PCI enumeration, resource is not allocated for the FPGA(PCI) device(requests 256MB of Memory space via BAR). Why resource allocation has not happened for the PCI (FPGA) device?
If a new on-board PCI device is added, do we have to do any configuration in EFI, to support that device?
Please help on this to fix this issue. Attached the logs and setup diagram.
This is just a guess, since I don't know the details on the BIOS you're using, but I would assume the issue is the size of the memory space request (256 MB). You can find out the maximum size empirically by reducing the size of the memory space request, until the BIOS successfully grants it. The BIOS would have to be modified to increase this maximum.
Hope that helps,