Why My NI PXIe-8861 is Unable to Boot Up When Daisy-Chained MXI With Several Chassis?

Updated Sep 24, 2025

Reported In

Hardware

  • PXIe-8861
  • PXIe-1084
  • PXIe-1095
  • PXIe-8360
  • PXIe-8364

Issue Details

I am using NI PXIe-8861 controller and daisy-chained MXI with four NI PXI chassis. I realize that the PXIe-8861 is unable to boot up with the following error:

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Solution

Disable the Thunderbolt support in BIOS will have the controller working normal again as the Thunderbolt will take up some PCIe resource and causing insufficient PCIe resource when connected to a number of chassis.

Here are the steps to modify the reserved bus number:

  1. Boot into BIOS.
  2. Navigate to Advanced tab and look for Thunderbolt configuration. Under Thunderbolt configuration, user can modify the setting for TBT ports.
  3. Look for Extra Bus Reserved number to modify PCIe bus number reserved. Take note the bus number reserved is divided equally between 2 Thunderbolt port.
  4. Hit F10 to save the changes and exit. The new setting will be implemented on next boot.

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