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

TI-NSPIRE based

modulename: zevio-timer.ko

and/or

clk-nspire.ko

configname: CONFIG_ARCH_NSPIRE

Linux Kernel Configuration
└─>TI-NSPIRE based
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This enables support for systems using the TI-NSPIRE CPU

source code:
selects
CONFIG_CPU_ARM926T
CONFIG_COMMON_CLK
CONFIG_GENERIC_CLOCKEVENTS
CONFIG_GENERIC_IRQ_CHIP
CONFIG_SPARSE_IRQ
CONFIG_ARM_AMBA
CONFIG_ARM_VIC
CONFIG_ARM_TIMER_SP804
CONFIG_USE_OF
CONFIG_CLKSRC_OF
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is selected by
CONFIG_KEYBOARD_NSPIRE
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