CONFIG_AT91_EARLY_DBGU1 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_AT91_EARLY_DBGU1.
Result is shown for kernelversion 5.3.7

DBGU on 9263 and 9g45

configname: CONFIG_AT91_EARLY_DBGU1

Select a UART for early kernel messages
└─>DBGU on 9263 and 9g45
In linux kernel since version 3.3 (release Date: 2012-03-18)