PCIe not working on Verdin Development Board

Technical Support
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1

Hi everyone,
are there any special step to be taken in order to activate PCI-Express on the Verdin Development Board?
I installed the most recent version of Torizon Core to my SoM and put an LTE-Modem (ublox MPCI-L210) into the mini PCIE slot.
However, PCIE does not seem to work at all. Log output:

dmesg | grep pcie
[    1.012919] imx6q-pcie 33800000.pcie: PLL REF_CLK is used!.
[    1.013527] imx6q-pcie 33800000.pcie: PCIe PHY PLL clock is locked.
[    1.043894] imx6q-pcie 33800000.pcie: PCIe PLL is locked.
[    1.283886] imx6q-pcie 33800000.pcie: iATU unroll: enabled
[    1.283901] imx6q-pcie 33800000.pcie: Detected iATU regions: 4 outbound, 4 inbound
[    1.283912] imx6q-pcie 33800000.pcie: host bridge /soc@0/pcie@33800000 ranges:
[    1.283952] imx6q-pcie 33800000.pcie:       IO 0x001ff80000..0x001ff8ffff -> 0x0000000000
[    1.283970] imx6q-pcie 33800000.pcie:      MEM 0x0018000000..0x001fefffff -> 0x0018000000
[    1.284058] imx6q-pcie 33800000.pcie: iATU unroll: enabled
[    1.284065] imx6q-pcie 33800000.pcie: Detected iATU regions: 4 outbound, 4 inbound
[    2.284525] imx6q-pcie 33800000.pcie: Phy link never came up
[    2.289976] imx6q-pcie: probe of 33800000.pcie failed with error -110

“Phy link never came up” sure does not sound good…

Your help is highly appreciated!

Model: Toradex 0058 Verdin iMX8M Plus Quad 4GB WB IT V1.0D
Carrier: Toradex Verdin Development Board V1.1A
Linux: 5.15.77-6.2.0+git.aa0ff7e3554e #1-TorizonCore

2

Hello @armin.schmidt,

Thanks for reaching out!
You can see from the datasheet (please refer to block diagram in section 1.3 and also section 2.5) of MPCI-L210 that it uses USB 2.0 interface. If you configure the image correctly, you should be able to see the device with lsusb command.
Let me know if that helps :slight_smile:

3

Thank you very much for help.
lsusb shows the device as expected

Bus 001 Device 005: ID 1546:1146 U-Blox AG

Can I safety ignore the message
probe of 33800000.pcie failed with error -110
or is this another issue that will cause trouble with an actual PCIe device?

4

Hello @armin.schmidt ,

According to this topic you could safely ignore this message.

Best regards,
Josep