This option starts 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, increase this value for
systems only 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"