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"