CONFIG_AT91_EARLY_USART4 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_AT91_EARLY_USART4.
Result is shown for kernelversion 6.2.5

USART4

configname: CONFIG_AT91_EARLY_USART4

Select a UART for early kernel messages
└─>USART4
In linux kernel since version 2.6.25 (release Date: 2008-04-16)