Usage - 2023.2 English

Vivado Design Suite User Guide: Programming and Debugging (UG908)

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2023.2 English
This option is used to start up the hw_server with the ability to enable ir lengths greater than 64 bits. The default value for this setting is 64. You can increase this value for devices in the JTAG chains whose ir lengths are wider (for example, 93).
Note: Increasing this number slows the device discovery process, which can slow cable access. Therefore, you should only increase this value for systems with long ir lengths and device counts.

This is how you specify the option at hw_server start-up:

hw_server -e "set max-ir-length 93"