CONFIG_BF518_UART1_PORTF is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin
default or selected kernelversion does not have config value CONFIG_BF518_UART1_PORTF.
Result is shown for kernelversion 5.6.18

PORT F

configname: CONFIG_BF518_UART1_PORTF

UART1
└─>PORT F
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
PORT F