CONFIG_DEBUG_SPEAR3XX is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
Kernel low-level debugging messages via ST SPEAr 3xx/6xx UART
configname: CONFIG_DEBUG_SPEAR3XX
Kernel low-level debugging port
└─>Kernel low-level debugging messages via ST SPEAr 3xx/6xx UART
In linux kernel since version 4.1 (release Date: 2015-06-21)
Say Y here if you want kernel low-level debugging support
on ST SPEAr based platforms.
on ST SPEAr based platforms.