CONFIG_ARCH_MX51 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
i.MX51
configname: CONFIG_ARCH_MX51
Freescale CPU family:
└─>i.MX51
In linux kernel since version 2.6.34 (release Date: 2010-05-16)
This enables support for systems based on the Freescale i.MX51 family