CONFIG_ARCH_ACORN is not available for thedefaultarchitecture x86.
Result is shown for architecture arm26

CONFIG_ARCH_ACORN (not configurable)

modulename: ecard.ko

configname: CONFIG_ARCH_ACORN

Linux Kernel Configuration
└─>ARCH_ACORN
In linux kernel since version 2.6.12  
source code:
is selected by
CONFIG_ARM_ETHERH