CONFIG_DEBUG_UART_8250 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
CONFIG_DEBUG_UART_8250 (not configurable)
configname: CONFIG_DEBUG_UART_8250
Linux Kernel Configuration
└─>Kernel hacking
└─>DEBUG_UART_8250
In linux kernel since version 3.10 (release Date: 2013-06-30)
is depended by
CONFIG_DEBUG_BCM_5301XCONFIG_DEBUG_OMAP2UART1
CONFIG_DEBUG_OMAP2UART2
CONFIG_DEBUG_OMAP2UART3
CONFIG_DEBUG_OMAP3UART3
CONFIG_DEBUG_OMAP4UART3
CONFIG_DEBUG_OMAP3UART4
CONFIG_DEBUG_OMAP4UART4
CONFIG_DEBUG_TI81XXUART1
CONFIG_DEBUG_TI81XXUART2
CONFIG_DEBUG_TI81XXUART3
CONFIG_DEBUG_AM33XXUART1