CONFIG_ALPHA_EIGER is not available for thedefaultarchitecture x86.
Result is shown for architecture alpha

Eiger

modulename: sys_eiger.ko

configname: CONFIG_ALPHA_EIGER

Alpha system type
└─>Eiger
In linux kernel since version 2.6.12  
Apparently an obscure OEM single-board computer based on the
Typhoon/Tsunami chipset family. Information on it is scanty.

source code:
arch/alpha/kernel/