CONFIG_BF518_UART1_PORTG is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin
default or selected kernelversion does not have config value CONFIG_BF518_UART1_PORTG.
Result is shown for kernelversion 5.6.18

PORT G

configname: CONFIG_BF518_UART1_PORTG

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