:orphan:

.. title:: CONFIG_X86_VERY_EARLY_CONSOLE

.. kconfig:: CONFIG_X86_VERY_EARLY_CONSOLE

CONFIG_X86_VERY_EARLY_CONSOLE
#############################

*Support very early boot printk*

Type: ``bool``

Help
====

.. code-block:: none

    Non-emulated X86 devices often require special hardware to attach
    a debugger, which may not be easily available. This option adds a
    very minimal serial driver which gets initialized at the very
    beginning of z_cstart(), via arch_kernel_init(). This driver enables
    printk to emit messages to the 16550 UART port 0 instance in device
    tree. This mini-driver assumes I/O to the UART is done via ports.

Direct dependencies
===================

\ :kconfig:`SOC_LAKEMONT <CONFIG_SOC_LAKEMONT>` || \ :kconfig:`SOC_LAKEMONT <CONFIG_SOC_LAKEMONT>` || (\ :kconfig:`PRINTK <CONFIG_PRINTK>` && \ :kconfig:`X86 <CONFIG_X86>`)

*(Includes any dependencies from ifs and menus.)*

Defaults
========

- n
- n
- y

Kconfig definitions
===================



At ``<Zephyr SoC>/x86/lakemont/Kconfig.defconfig:15``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:25`` → ``<BuildDir>/kconfig/Kconfig.soc.defconfig:1``

Menu path: (Top)

.. code-block:: kconfig

    config X86_VERY_EARLY_CONSOLE
    	bool
    	default n
    	depends on SOC_LAKEMONT

----

At ``<Zephyr SoC>/x86/lakemont/Kconfig.defconfig:15``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:27``

Menu path: (Top)

.. code-block:: kconfig

    config X86_VERY_EARLY_CONSOLE
    	bool
    	default n
    	depends on SOC_LAKEMONT

----

At ``<Zephyr Architecture>/x86/Kconfig:326``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:39`` → ``<Zephyr Architecture>/Kconfig:12``

Menu path: (Top) → X86 Architecture Options

.. code-block:: kconfig

    config X86_VERY_EARLY_CONSOLE
    	bool "Support very early boot printk"
    	default y
    	depends on PRINTK && X86
    	help
    	  Non-emulated X86 devices often require special hardware to attach
    	  a debugger, which may not be easily available. This option adds a
    	  very minimal serial driver which gets initialized at the very
    	  beginning of z_cstart(), via arch_kernel_init(). This driver enables
    	  printk to emit messages to the 16550 UART port 0 instance in device
    	  tree. This mini-driver assumes I/O to the UART is done via ports.

*(The 'depends on' condition includes propagated dependencies from ifs and menus.)*