CONFIG_EARLY_PRINTK: Activate early kernel debugging

General informations

The Linux kernel configuration item CONFIG_EARLY_PRINTK has multiple definitions:

Activate early kernel debugging found in arch/nios2/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Activate early kernel debugging
• type: bool
• depends on: CONFIG_TTY
• defined in arch/nios2/Kconfig.debug
• found in Linux kernels: 4.0–4.20, 5.0–5.19, 6.0–6.17, 6.18-rc+HEAD

Help text

Enable early printk on console. This is useful for kernel debugging when your machine crashes very early before the console code is initialized. You should normally say N here, unless you want to debug such a crash.

Early printk found in arch/x86/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early printk
• type: bool
• depends on: CONFIG_EXPERT
• defined in arch/x86/Kconfig.debug
• found in Linux kernels: 2.6.24–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.17, 6.18-rc+HEAD

Help text

Write kernel log output directly into the VGA buffer or to a serial port.

This is useful for kernel debugging when your machine crashes very early before the console code is initialized. For normal operation it is not recommended because it looks ugly and doesn't cooperate with klogd/syslogd or the X server. You should normally say N here, unless you want to debug such a crash.

Early printk found in arch/um/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early printk
• type: bool
• depends on: (none)
• defined in arch/um/Kconfig.debug
• found in Linux kernels: 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.17, 6.18-rc+HEAD

Help text

Write kernel log output directly to stdout.

This is useful for kernel debugging when your machine crashes very early before the console code is initialized.

Early printk found in arch/sh/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early printk
• type: bool
• depends on: CONFIG_SH_STANDARD_BIOS
• defined in arch/sh/Kconfig.debug
• found in Linux kernels: 6.7–6.17, 6.18-rc+HEAD

Help text

Say Y here to redirect kernel printk messages to the serial port used by the SH-IPL bootloader, starting very early in the boot process and ending when the kernel's serial console is initialised. This option is only useful while porting the kernel to a new machine, when the kernel may crash or hang before the serial console is initialised. If unsure, say N.

Early printk found in arch/mips/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early printk
• type: bool
• depends on: ( CONFIG_EXPERT ) && ( CONFIG_SYS_HAS_EARLY_PRINTK )
• defined in arch/mips/Kconfig.debug
• found in Linux kernels: 2.6.33–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.17, 6.18-rc+HEAD

Help text

This option enables special console drivers which allow the kernel to print messages very early in the bootup process.

This is useful for kernel debugging when your machine crashes very early before the console code is initialized. For normal operation, it is not recommended because it looks ugly on some machines and doesn't cooperate with an X server. You should normally say N here, unless you want to debug such a crash.

Early printk found in arch/m68k/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early printk
• type: bool
• depends on: CONFIG_MMU_MOTOROLA
• defined in arch/m68k/Kconfig.debug
• found in Linux kernels: 3.3–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.17, 6.18-rc+HEAD

Help text

Write kernel log output directly to a serial port. Where implemented, output goes to the framebuffer as well. PROM console functionality on Sun 3x is not affected by this option.

Pass "earlyprintk" on the kernel command line to get a boot console.

This is useful for kernel debugging when your machine crashes very early, i.e. before the normal console driver is loaded. You should normally say N here, unless you want to debug such a crash.

Early printk found in arch/arm/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early printk
• type: bool
• depends on: CONFIG_DEBUG_LL
• defined in arch/arm/Kconfig.debug
• found in Linux kernels: 2.6.33–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.17, 6.18-rc+HEAD

Help text

Say Y here if you want to have an early console using the kernel low-level debugging functions. Add earlyprintk to your kernel parameters to enable this console.

found in arch/s390/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt:
• type: bool
• depends on: (none)
• defined in arch/s390/Kconfig.debug
• found in Linux kernels: 4.11–4.20, 5.0–5.19, 6.0–6.17, 6.18-rc+HEAD

Help text

(none)

found in arch/powerpc/Kconfig

The configuration item CONFIG_EARLY_PRINTK:

• prompt:
• type: bool
• depends on: (none)
• defined in arch/powerpc/Kconfig
• found in Linux kernels: 2.6.15–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.17, 6.18-rc+HEAD

Help text

(none)

found in arch/hexagon/Kconfig

The configuration item CONFIG_EARLY_PRINTK:

• prompt:
• type: bool
• depends on: (none)
• defined in arch/hexagon/Kconfig
• found in Linux kernels: 3.2–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.17, 6.18-rc+HEAD

Help text

(none)

found in arch/alpha/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt:
• type: bool
• depends on: CONFIG_ALPHA_GENERIC || CONFIG_ALPHA_SRM
• defined in arch/alpha/Kconfig.debug
• found in Linux kernels: 2.6.9–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.17, 6.18-rc+HEAD

Help text

(none)

found in arch/unicore32/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt:
• type: bool
• depends on: (none)
• defined in arch/unicore32/Kconfig.debug
• found in Linux kernels: 2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.8

Help text

Write kernel log output directly into the ocd or to a serial port.

This is useful for kernel debugging when your machine crashes very early before the console code is initialized. For normal operation it is not recommended because it looks ugly and doesn't cooperate with klogd/syslogd or the X server. You should normally N here, unless you want to debug such a crash.

found in arch/riscv/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt:
• type: bool
• depends on: (none)
• defined in arch/riscv/Kconfig.debug
• found in Linux kernels: 4.19–4.20

Help text

(none)

found in arch/riscv/Kconfig

The configuration item CONFIG_EARLY_PRINTK:

• prompt:
• type: bool
• depends on: (none)
• defined in arch/riscv/Kconfig
• found in Linux kernels: 4.15–4.18

Help text

(none)

Early printk function for kernel found in arch/microblaze/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early printk function for kernel
• type: bool
• depends on: CONFIG_SERIAL_UARTLITE_CONSOLE || CONFIG_SERIAL_8250_CONSOLE
• defined in arch/microblaze/Kconfig.debug
• found in Linux kernels: 2.6.30–2.6.39, 3.0–3.19, 4.0–4.17

Help text

This option turns on/off early printk messages to console. First Uartlite node is taken.

Early printk found in arch/tile/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early printk
• type: bool
• depends on: CONFIG_EXPERT && CONFIG_DEBUG_KERNEL
• defined in arch/tile/Kconfig.debug
• found in Linux kernels: 2.6.36–2.6.39, 3.0–3.19, 4.0–4.16

Help text

Write kernel log output directly via the hypervisor console.

This is useful for kernel debugging when your machine crashes very early before the console code is initialized. For normal operation it is not recommended because it looks ugly and doesn't cooperate with klogd/syslogd. You should normally N here, unless you want to debug such a crash.

Early printk found in arch/blackfin/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early printk
• type: bool
• depends on: (none)
• defined in arch/blackfin/Kconfig.debug
• found in Linux kernels: 2.6.24–2.6.39, 3.0–3.19, 4.0–4.16

Help text

This option enables special console drivers which allow the kernel to print messages very early in the bootup process.

This is useful for kernel debugging when your machine crashes very early before the console code is initialized. After enabling this feature, you must add "earlyprintk=serial,uart0,57600" to the command line (bootargs). It is safe to say Y here in all cases, as all of this lives in the init section and is thrown away after the kernel boots completely.

Early printk found in arch/arc/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early printk
• type: bool
• depends on: CONFIG_EMBEDDED
• defined in arch/arc/Kconfig.debug
• found in Linux kernels: 3.9–3.19, 4.0

Help text

Write kernel log output directly into the VGA buffer or to a serial port.

This is useful for kernel debugging when your machine crashes very early before the console code is initialized. For normal operation it is not recommended because it looks ugly and doesn't cooperate with klogd/syslogd or the X server. You should normally N here, unless you want to debug such a crash.

Early printk support found in arch/arm64/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early printk support
• type: bool
• depends on: (none)
• defined in arch/arm64/Kconfig.debug
• found in Linux kernels: 3.9–3.15

Help text

Say Y here if you want to have an early console using the earlyprintk=<name>[,<addr>][,<options>] kernel parameter. It is assumed that the early console device has been initialised by the boot loader prior to starting the Linux kernel.

Early printk support found in arch/sh/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early printk support
• type: bool
• depends on: CONFIG_SH_STANDARD_BIOS || CONFIG_EARLY_SCIF_CONSOLE
• defined in arch/sh/Kconfig.debug
• found in Linux kernels: 2.6.9–2.6.32

Help text

Say Y here to redirect kernel printk messages to the serial port used by the SH-IPL bootloader, starting very early in the boot process and ending when the kernel's serial console is initialised. This option is only useful porting the kernel to a new machine, when the kernel may crash or hang before the serial console is initialised. If unsure, say N.

On devices that are running SH-IPL and want to keep the port initialization consistent while not using the BIOS callbacks, select both the EARLY_SCIF_CONSOLE and SH_STANDARD_BIOS, using the kernel command line option to toggle back and forth.

Early printk found in arch/mips/Kconfig

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early printk
• type: bool
• depends on: ( CONFIG_EMBEDDED && CONFIG_DEBUG_KERNEL ) && ( CONFIG_SYS_HAS_EARLY_PRINTK )
• defined in arch/mips/Kconfig
• found in Linux kernels: 2.6.21–2.6.32

Help text

This option enables special console drivers which allow the kernel to print messages very early in the bootup process.

This is useful for kernel debugging when your machine crashes very early before the console code is initialized. For normal operation, it is not recommended because it looks ugly on some machines and doesn't cooperate with an X server. You should normally say N here, unless you want to debug such a crash.

Early SCIF console support found in arch/sh64/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early SCIF console support
• type: bool
• depends on: (none)
• defined in arch/sh64/Kconfig.debug
• found in Linux kernels: 2.6.9–2.6.24

Help text

(none)

Early printk found in arch/i386/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early printk
• type: bool
• depends on: CONFIG_EMBEDDED && CONFIG_DEBUG_KERNEL
• defined in arch/i386/Kconfig.debug
• found in Linux kernels: 2.6.9–2.6.23

Help text

Write kernel log output directly into the VGA buffer or to a serial port.

This is useful for kernel debugging when your machine crashes very early before the console code is initialized. For normal operation it is not recommended because it looks ugly and doesn't cooperate with klogd/syslogd or the X server. You should normally N here, unless you want to debug such a crash.

found in arch/x86_64/Kconfig

The configuration item CONFIG_EARLY_PRINTK:

• prompt:
• type: bool
• depends on: (none)
• defined in arch/x86_64/Kconfig
• found in Linux kernels: 2.5.45–2.5.75, 2.6.0–2.6.23

Help text

(none)

Early console support found in arch/mips/cobalt/Kconfig

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early console support
• type: bool
• depends on: CONFIG_MIPS_COBALT
• defined in arch/mips/cobalt/Kconfig
• found in Linux kernels: 2.6.17–2.6.20

Help text

Provide early console support by direct access to the on board UART. The UART must have been previously initialised by the boot loader.

found in arch/mips/Kconfig

The configuration item CONFIG_EARLY_PRINTK:

• prompt:
• type: bool
• depends on: (none)
• defined in arch/mips/Kconfig
• found in Linux kernels: 2.6.4–2.6.20

Help text

(none)

Early printk found in arch/frv/Kconfig.debug

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early printk
• type: bool
• depends on: CONFIG_EMBEDDED && CONFIG_DEBUG_KERNEL
• defined in arch/frv/Kconfig.debug
• found in Linux kernels: 2.6.12–2.6.15

Help text

Write kernel log output directly into the VGA buffer or to a serial port.

This is useful for kernel debugging when your machine crashes very early before the console code is initialized. For normal operation it is not recommended because it looks ugly and doesn't cooperate with klogd/syslogd or the X server. You should normally N here, unless you want to debug such a crash.

found in arch/ppc64/Kconfig

The configuration item CONFIG_EARLY_PRINTK:

• prompt:
• type: bool
• depends on: (none)
• defined in arch/ppc64/Kconfig
• found in Linux kernels: 2.5.45–2.5.75, 2.6.0–2.6.14

Help text

(none)

Early printk found in arch/frv/Kconfig

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early printk
• type: bool
• depends on: CONFIG_EMBEDDED && CONFIG_DEBUG_KERNEL
• defined in arch/frv/Kconfig
• found in Linux kernels: 2.6.11

Help text

Write kernel log output directly into the VGA buffer or to a serial port.

This is useful for kernel debugging when your machine crashes very early before the console code is initialized. For normal operation it is not recommended because it looks ugly and doesn't cooperate with klogd/syslogd or the X server. You should normally N here, unless you want to debug such a crash.

Early SCIF console support found in arch/sh64/Kconfig

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early SCIF console support
• type: bool
• depends on: (none)
• defined in arch/sh64/Kconfig
• found in Linux kernels: 2.6.8

Help text

(none)

Early printk support found in arch/sh/Kconfig

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early printk support
• type: bool
• depends on: CONFIG_SH_STANDARD_BIOS || CONFIG_EARLY_SCIF_CONSOLE
• defined in arch/sh/Kconfig
• found in Linux kernels: 2.6.8

Help text

Say Y here to redirect kernel printk messages to the serial port used by the SH-IPL bootloader, starting very early in the boot process and ending when the kernel's serial console is initialised. This option is only useful porting the kernel to a new machine, when the kernel may crash or hang before the serial console is initialised. If unsure, say N.

Early printk found in arch/i386/Kconfig

The configuration item CONFIG_EARLY_PRINTK:

• prompt: Early printk
• type: bool
• depends on: CONFIG_EMBEDDED
• defined in arch/i386/Kconfig
• found in Linux kernels: 2.6.4–2.6.8

Help text

Write kernel log output directly into the VGA buffer or to a serial port.

This is useful for kernel debugging when your machine crashes very early before the console code is initialized. For normal operation it is not recommended because it looks ugly and doesn't cooperate with klogd/syslogd or the X server. You should normally N here, unless you want to debug such a crash.

found in arch/alpha/Kconfig

The configuration item CONFIG_EARLY_PRINTK:

• prompt:
• type: bool
• depends on: CONFIG_ALPHA_GENERIC || CONFIG_ALPHA_SRM
• defined in arch/alpha/Kconfig
• found in Linux kernels: 2.5.60–2.5.75, 2.6.0–2.6.8

Help text

(none)

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