CONFIG_CMDLINE: Kernel command line arguments string

General informations

The Linux kernel configuration item CONFIG_CMDLINE has multiple definitions:

Kernel command line arguments string found in arch/sh/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Kernel command line arguments string
• type: string
• depends on: CONFIG_CMDLINE_OVERWRITE || CONFIG_CMDLINE_EXTEND
• defined in arch/sh/Kconfig
• found in Linux kernels: 2.6.32–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

(none)

Built-in kernel command string found in arch/x86/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Built-in kernel command string
• type: string
• depends on: CONFIG_CMDLINE_BOOL
• defined in arch/x86/Kconfig
• found in Linux kernels: 2.6.28–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

Enter arguments here that should be compiled into the kernel image and used at boot time. If the boot loader provides a command line at boot time, it is appended to this string to form the full kernel command line, when the system boots.

However, you can use the CMDLINE_OVERRIDE option to change this behavior.

In most cases, the command line (whether built-in or provided by the boot loader) should specify the device for the root file system.

Initial kernel command string found in arch/xtensa/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Initial kernel command string
• type: string
• depends on: CONFIG_CMDLINE_BOOL
• defined in arch/xtensa/Kconfig
• found in Linux kernels: 2.6.13–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

On some architectures (EBSA110 and CATS), there is currently no way for the boot loader to pass arguments to the kernel. For these architectures, you should supply some command-line options at build time by entering them here. As a minimum, you should specify the memory size and the root device (e.g., mem=64M root=/dev/nfs).

Initial kernel command string found in arch/sparc/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Initial kernel command string
• type: string
• depends on: CONFIG_CMDLINE_BOOL
• defined in arch/sparc/Kconfig
• found in Linux kernels: 2.6.29–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

Say Y here if you want to be able to pass default arguments to the kernel. This will be overridden by the bootloader, if you use one (such as SILO). This is most useful if you want to boot a kernel from TFTP, and want default options to be available with having them passed on the command line.

NOTE: This option WILL override the PROM bootargs setting!

Initial kernel command string found in arch/powerpc/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Initial kernel command string
• type: string
• 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, 6.0–6.8, 6.9-rc+HEAD

Help text

On some platforms, there is currently no way for the boot loader to pass arguments to the kernel. For these platforms, you can supply some command-line options at build time by entering them here. In most cases you will need to specify the root device here.

Default kernel command string found in arch/openrisc/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Default kernel command string
• type: string
• depends on: (none)
• defined in arch/openrisc/Kconfig
• found in Linux kernels: 3.1–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

On some architectures there is currently no way for the boot loader to pass arguments to the kernel. For these architectures, you should supply some command-line options at build time by entering them here.

Default kernel command string found in arch/nios2/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Default kernel command string
• type: string
• depends on: CONFIG_CMDLINE_BOOL
• defined in arch/nios2/Kconfig
• found in Linux kernels: 3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

On some platforms, there is currently no way for the boot loader to pass arguments to the kernel. For these platforms, you can supply some command-line options at build time by entering them here. In other cases you can specify kernel args so that you don't have to set them up in board prom initialization routines.

Default kernel command string found in arch/mips/Kconfig.debug

The configuration item CONFIG_CMDLINE:

• prompt: Default kernel command string
• type: string
• depends on: CONFIG_CMDLINE_BOOL
• defined in arch/mips/Kconfig.debug
• found in Linux kernels: 2.6.9–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

On some platforms, there is currently no way for the boot loader to pass arguments to the kernel. For these platforms, and for the cases when you want to add some extra options to the command line or ignore the default command line, you can supply some command-line options at build time by entering them here. In other cases you can specify kernel args so that you don't have to set them up in board prom initialization routines.

For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE options.

Default kernel command string found in arch/microblaze/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Default kernel command string
• type: string
• depends on: CONFIG_CMDLINE_BOOL
• defined in arch/microblaze/Kconfig
• found in Linux kernels: 2.6.30–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

On some architectures there is currently no way for the boot loader to pass arguments to the kernel. For these architectures, you should supply some command-line options at build time by entering them here.

Default kernel command string found in arch/hexagon/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Default kernel command string
• type: string
• depends on: (none)
• defined in arch/hexagon/Kconfig
• found in Linux kernels: 3.2–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

On some platforms, there is currently no way for the boot loader to pass arguments to the kernel. For these, you should supply some command-line options at build time by entering them here. At a minimum, you should specify the memory size and the root device (e.g., mem=64M root=/dev/nfs).

Default kernel command string found in arch/arm64/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Default kernel command string
• type: string
• depends on: (none)
• defined in arch/arm64/Kconfig
• found in Linux kernels: 3.7–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

Provide a set of default command-line options at build time by entering them here. As a minimum, you should specify the the root device (e.g. root=/dev/nfs).

Default kernel command string found in arch/arm/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Default kernel command string
• type: string
• depends on: (none)
• defined in arch/arm/Kconfig
• found in Linux kernels: 2.5.45–2.5.75, 2.6.0–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

On some architectures (e.g. CATS), there is currently no way for the boot loader to pass arguments to the kernel. For these architectures, you should supply some command-line options at build time by entering them here. As a minimum, you should specify the memory size and the root device (e.g., mem=64M root=/dev/nfs).

Built-in kernel command line found in arch/riscv/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Built-in kernel command line
• type: string
• depends on: (none)
• defined in arch/riscv/Kconfig
• found in Linux kernels: 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

For most platforms, the arguments for the kernel's command line are provided at run-time, during boot. However, there are cases where either no arguments are being provided or the provided arguments are insufficient or even invalid.

When that occurs, it is possible to define a built-in command line here and choose how the kernel should use it later on.

Built-in kernel command line found in arch/loongarch/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Built-in kernel command line
• type: string
• depends on: (none)
• defined in arch/loongarch/Kconfig
• found in Linux kernels: 5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

For most platforms, the arguments for the kernel's command line are provided at run-time, during boot. However, there are cases where either no arguments are being provided or the provided arguments are insufficient or even invalid.

When that occurs, it is possible to define a built-in command line here and choose how the kernel should use it later on.

Kernel command line found in arch/c6x/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Kernel command line
• type: string
• depends on: CONFIG_CMDLINE_BOOL
• defined in arch/c6x/Kconfig
• found in Linux kernels: 3.3–3.19, 4.0–4.20, 5.0–5.11

Help text

On some architectures there is currently no way for the boot loader to pass arguments to the kernel. For these architectures, you should supply some command-line options at build time by entering them here.

Default kernel command string found in arch/unicore32/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Default kernel command string
• type: string
• depends on: (none)
• defined in arch/unicore32/Kconfig
• found in Linux kernels: 2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.8

Help text

(none)

Built-in kernel command string found in arch/riscv/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Built-in kernel command string
• type: string
• depends on: CONFIG_CMDLINE_BOOL
• defined in arch/riscv/Kconfig
• found in Linux kernels: 4.15–4.18, 4.20

Help text

Supply command-line options at build time by entering them here.

Built-in kernel command string found in arch/riscv/Kconfig.debug

The configuration item CONFIG_CMDLINE:

• prompt: Built-in kernel command string
• type: string
• depends on: CONFIG_CMDLINE_BOOL
• defined in arch/riscv/Kconfig.debug
• found in Linux kernels: 4.19

Help text

Supply command-line options at build time by entering them here.

Built-in kernel command string found in arch/tile/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Built-in kernel command string
• type: string
• depends on: CONFIG_CMDLINE_BOOL
• defined in arch/tile/Kconfig
• found in Linux kernels: 2.6.36–2.6.39, 3.0–3.19, 4.0–4.16

Help text

Enter arguments here that should be compiled into the kernel image and used at boot time. If the boot loader provides a command line at boot time, it is appended to this string to form the full kernel command line, when the system boots.

However, you can use the CMDLINE_OVERRIDE option to change this behavior.

In most cases, the command line (whether built-in or provided by the boot loader) should specify the device for the root file system.

Default kernel command string found in arch/score/Kconfig.debug

The configuration item CONFIG_CMDLINE:

• prompt: Default kernel command string
• type: string
• depends on: (none)
• defined in arch/score/Kconfig.debug
• found in Linux kernels: 2.6.32–2.6.39, 3.0–3.19, 4.0–4.16

Help text

On some platforms, there is currently no way for the boot loader to pass arguments to the kernel. For these platforms, you can supply some command-line options at build time by entering them here. In other cases you can specify kernel args so that you don't have to set them up in board prom initialization routines.

Initial kernel command string found in arch/blackfin/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Initial kernel command string
• type: string
• depends on: CONFIG_CMDLINE_BOOL
• defined in arch/blackfin/Kconfig
• found in Linux kernels: 2.6.22–2.6.39, 3.0–3.19, 4.0–4.16

Help text

If you don't have a boot loader capable of passing a command line string to the kernel, you may specify one here. As a minimum, you should specify the memory size and the root device (e.g., mem=8M, root=/dev/nfs).

Kernel command line found in arch/metag/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Kernel command line
• type: string
• depends on: CONFIG_CMDLINE_BOOL
• defined in arch/metag/Kconfig
• found in Linux kernels: 3.9–3.19, 4.0–4.16

Help text

On some architectures there is currently no way for the boot loader to pass arguments to the kernel. For these architectures, you should supply some command-line options at build time by entering them here.

Default kernel command line found in arch/avr32/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Default kernel command line
• type: string
• depends on: (none)
• defined in arch/avr32/Kconfig
• found in Linux kernels: 2.6.19–2.6.39, 3.0–3.19, 4.0–4.11

Help text

If you don't have a boot loader capable of passing a command line string to the kernel, you may specify one here. As a minimum, you should specify the memory size and the root device (e.g., mem=8M, root=/dev/nfs).

Kernel command line to built-in found in arch/arc/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Kernel command line to built-in
• type: string
• depends on: (none)
• defined in arch/arc/Kconfig
• found in Linux kernels: 3.9

Help text

The default command line which will be appended to the optional u-boot provided command line (see below)

Initial kernel command string found in arch/sh/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Initial kernel command string
• type: string
• depends on: CONFIG_CMDLINE_BOOL
• defined in arch/sh/Kconfig
• found in Linux kernels: 2.5.71–2.5.75, 2.6.0–2.6.31

Help text

(none)

Initial kernel command string found in arch/sparc64/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Initial kernel command string
• type: string
• depends on: CONFIG_CMDLINE_BOOL
• defined in arch/sparc64/Kconfig
• found in Linux kernels: 2.6.2–2.6.28

Help text

Say Y here if you want to be able to pass default arguments to the kernel. This will be overridden by the bootloader, if you use one (such as SILO). This is most useful if you want to boot a kernel from TFTP, and want default options to be available with having them passed on the command line.

NOTE: This option WILL override the PROM bootargs setting!

Initial kernel command string found in arch/ppc/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Initial kernel command string
• type: string
• depends on: CONFIG_CMDLINE_BOOL
• defined in arch/ppc/Kconfig
• found in Linux kernels: 2.5.45–2.5.75, 2.6.0–2.6.26

Help text

On some platforms, there is currently no way for the boot loader to pass arguments to the kernel. For these platforms, you can supply some command-line options at build time by entering them here. In most cases you will need to specify the root device here.

Default kernel command string found in arch/arm26/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Default kernel command string
• type: string
• depends on: (none)
• defined in arch/arm26/Kconfig
• found in Linux kernels: 2.5.71–2.5.75, 2.6.0–2.6.22

Help text

On some architectures (EBSA110 and CATS), there is currently no way for the boot loader to pass arguments to the kernel. For these architectures, you should supply some command-line options at build time by entering them here. As a minimum, you should specify the memory size and the root device (e.g., mem=64M root=/dev/nfs).

Initial kernel command string found in arch/ppc64/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Initial kernel command string
• type: string
• depends on: CONFIG_CMDLINE_BOOL
• defined in arch/ppc64/Kconfig
• found in Linux kernels: 2.5.45–2.5.75, 2.6.0–2.6.14

Help text

On some platforms, there is currently no way for the boot loader to pass arguments to the kernel. For these platforms, you can supply some command-line options at build time by entering them here. In most cases you will need to specify the root device here.

Default kernel command string found in arch/mips/Kconfig

The configuration item CONFIG_CMDLINE:

• prompt: Default kernel command string
• type: string
• depends on: (none)
• defined in arch/mips/Kconfig
• found in Linux kernels: 2.6.4–2.6.8

Help text

On some platforms, there is currently no way for the boot loader to pass arguments to the kernel. For these platforms, you can supply some command-line options at build time by entering them here. In other cases you can specify kernel args so that you don't have to set them up in board prom initialization routines.

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