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Problem with PCIe Root Complex nic sample

Former Member

Hello,

I am having trouble running the PCIe Endpoint Ethernet NIC sample on a Mini-ITX XC7Z045 board.

I have the exact model Broadcom BCM5751 nic and the most recent (v1) of the PCIe Root Complex Reference Design file for the 7Z045.

I have set the board jumpers as described in section 4.2 of Zynq_Mini_ITX_PCIe_RC_Design.pdf and copied the files in the sd_image_nic directory to a FAT32 uSD card.

Linux boots fine on the board and the blue "Done" light comes on.

However, the lspci command returns nothing.

I also ran "dmesg |grep pcie" and "ifconfig" to try to troubleshot .

zynq> lspci
zynq> dmesg |grep pcie
xaxi_pcie_init_port: Link is Down
xaxi_pcie_of_probe: Port Initalization failed
xaxi_pcie_init: Root Port Probe failed
zynq> ifconfig
zynq>

It seems the pcie controller isn't being detected.

I have also tried two other PCIe cards, an AHCI SSD and a USB3 controller with exactly the same results so I do not think that it's a bad NIC.

Is it possible there is some other jumper or dipswitch that was incorrectly at the factory? Or perhaps my board is defective?

Please let me know if there is any other diagnostic I can perform.

Thanks,
Jordan

  • 0

    We have seen cold solder joints on U40 device, which provides the 100 MHz clock to the PCIe slot as well as the PCIe IP in the Zynq. Would you probe R218 and R219 (on the back side of the board near U40) to see if 100 MHz PCIe slot clock is present? You can also probe C314 and C315 (on the back side below the Zynq device) to make sure the 100 MHz clock is also driven to the Zynq device to clock the PCIe IP.

    If you don't see the 100 MHz clock, there are two options:

    1) See if you can re-solder U40.

    2) RMA the board and we will repair it.

  • 0

    We tested it and there does indeed seem to be a cold solder joint on U40. We see the clock on the IC pin but not on the resistors. I'll see if one of our techs is willing to re-solder it. If not I'll RMA it.
    Thanks for your assistance.