CONFIG_ARCH_MX5 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_ARCH_MX5.
Result is shown for kernelversion 6.2.5

CONFIG_ARCH_MX5 (not configurable)

configname: CONFIG_ARCH_MX5

Linux Kernel Configuration
└─>ARCH_MX5
In linux kernel since version 2.6.34 (release Date: 2010-05-16)