Bifurication not working with Gen 4 PCI-Express, and more problems with GEN 4 PCI support

• DdH

  Derek den Haas

  10/3/23, 5:15 PM

  When you bifuricate for example root complex 1 (the top x16 slot) in 4x4x4x4, it is not possible to set it to GEN4 speeds, only the first 4 lanes will get the GEN4 speeds, the others will default to GEN3 speeds, while I've set them all to GEN 4 speeds.

  Further when you set the 2 x8 slots to GEN 4, only the first slot will get GEN4 speeds, the other will fall back to GEN 3 speeds.

  Also when setting ANY device to GEN 4, the ASPM does not work, you should disable pcie_aspm=off in the linux args. This is in the latest LInux 6.5.5/6.1.55 version.

  
  Any suggestions or advice. I'm also running the latest firmware from your wiki.

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• A

  Anson Staff member

  10/5/23, 2:51 AM

  Hi Derek,

    Can you send me an email, I will ask an expert to provide you the proper configuration to fix the issue.

  Email address: anson.ruan@adlinktech.com

  Thanks

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