kernelconfig_penguin
CONFIG_DEBUG_SPEAR13XX is not available for the default architecture x86.
Result is shown for architecture arm

Kernel low-level debugging messages via ST SPEAr 13xx UART

configname: CONFIG_DEBUG_SPEAR13XX

Kernel low-level debugging port
└─> Kernel low-level debugging messages via ST SPEAr 13xx UART

Say Y here if you want kernel low-level debugging support
on ST SPEAr13xx based platforms.