CONFIG_DEBUG_OMAP7XXUART3 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
Kernel low-level debugging via OMAP730 UART3
configname: CONFIG_DEBUG_OMAP7XXUART3
Kernel low-level debugging port
└─>Kernel low-level debugging via OMAP730 UART3
In linux kernel since version 4 (release Date: 2015-04-12)
Say Y here if you want kernel low-level debugging support
on OMAP730 based platforms on the UART3.
on OMAP730 based platforms on the UART3.