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.

Direct dependencies¶

PRINTK && X86

(Includes any dependencies from ifs and menus.)

Default¶

y

Kconfig definition¶

At <Zephyr>/arch/x86/Kconfig:172

Included via <Zephyr>/Kconfig:8 → <Zephyr>/Kconfig.zephyr:29 → <Zephyr>/arch/Kconfig:12

Menu path: (Top) → X86 Architecture Options

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.)