CONFIG_EISA is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

EISA support

modulename: eisa.ko

and/or

eisa-bus.ko

and/or

ip22-eisa.ko

configname: CONFIG_EISA

Linux/MIPS Kernel Configuration
└─>Bus options (PCI, PCMCIA, EISA, ISA, TC)
└─>EISA support
In linux kernel since version 2.6.12  
The Extended Industry Standard Architecture (EISA) bus was
developed as an open alternative to the IBM MicroChannel bus.

The EISA bus provided some of the features of the IBM MicroChannel
bus while maintaining backward compatibility with cards made for
the older ISA bus. The EISA bus saw limited use between 1988 and
1995 when it was made obsolete by the PCI bus.

Say Y here if you are building a kernel for an EISA-based machine.

Otherwise, say N.