CONFIG_ARCH_MX1 is not available for the selected architecture x86.
Result is shown for architecture arm
MX1-based
modulename: iomux-mx1-mx2.ko
configname: CONFIG_ARCH_MX1
Freescale CPU family:
└─>MX1-based
In linux kernel since version 2.6.29 (release Date: 2009-03-23)
This enables support for systems based on the Freescale i.MX1 family