CONFIG_DEBUG_UART_8250_PALMCHIP is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

8250 UART is Palmchip BK-310x


Linux Kernel Configuration
└─>8250 UART is Palmchip BK-310x
In linux kernel since version 4.1 (release Date: 2015-06-21)  
Palmchip provides a UART implementation compatible with 16550
except for having a different register layout. Say Y here if
the debug UART is of this type.