CONFIG_ARCH_PXA_ESERIES is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

PXA based Toshiba e-series PDAs

modulename: eseries.ko

configname: CONFIG_ARCH_PXA_ESERIES

Linux Kernel Configuration
└─>Intel PXA2xx/PXA3xx Implementations
└─>PXA based Toshiba e-series PDAs
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
source code:
/arch/arm/mach-pxa/eseries.c

depends
CONFIG_ARCH_PXA

is selected by
CONFIG_PCMCIA_PXA2XX