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xalverti's avatar
xalverti
Icon for Occasional Contributor rankOccasional Contributor
2 years ago
Solved

Problem with CXL IP Design Example Type 3 on DK-DEV-AGI027RBES

Hi, We are using Quartus 24.1 to compile the type 3 ddr memory design example for the board and program the FPGA using the following guide: Agilex™ 7 R-Tile Compute Express Link* (CXL*) FPGA IP Des...
Cxl
  • xalverti's avatar
    xalverti
    2 years ago

    Hi again,

    The problem was on the PCIe slot on the server side.

    We replaced our card and the problem was fixed.

    For anyone facing the same problems, we had to check the x16 slot with other devices to identify the lane drop issue in BIOS.

    CXL IP designs apparently are note recognized in BIOS as PCIe devices even when the design is working -- the corresponding PCIe slot always shows the message "Link did not train" -- as if nothing is attached on the slot.

    Thank you for your help,

    Chloe

xalverti's avatar
xalverti
Icon for Occasional Contributor rankOccasional Contributor
2 years ago

Hi,

Thank you for your reply -- We are trying to figure out if it is a server problem as you pointed out.

Our server is CXL compatible but we may face a PCIe drop lane issue.

As a clarification the CXL IP cannot tolerate 8 lanes on the PCIe slot, right?

I will keep you posted once we have figured out.

Best,

Chloe

xalverti's avatar
xalverti
Icon for Occasional Contributor rankOccasional Contributor
2 years ago

Hi again,

The problem was on the PCIe slot on the server side.

We replaced our card and the problem was fixed.

For anyone facing the same problems, we had to check the x16 slot with other devices to identify the lane drop issue in BIOS.

CXL IP designs apparently are note recognized in BIOS as PCIe devices even when the design is working -- the corresponding PCIe slot always shows the message "Link did not train" -- as if nothing is attached on the slot.

Thank you for your help,

Chloe