CONFIG_IA64_SGI_SN2 is not available for the default architecture x86.
Result is shown for architecture ia64


configname: CONFIG_IA64_SGI_SN2

System type
└─> SGI-SN2

Selecting this option will optimize the kernel for use on sn2 based
systems, but the resulting kernel binary will not run on other
types of ia64 systems. If you have an SGI Altix system, it's safe
to select this option. If in doubt, select ia64 generic support