CONFIG_DEBUG_TI81XXUART1 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
Kernel low-level debugging messages via TI81XX UART1 (ti8148evm)
configname: CONFIG_DEBUG_TI81XXUART1
Kernel low-level debugging port
└─>Kernel low-level debugging messages via TI81XX UART1 (ti8148evm)