CONFIG_DEVTMPFS_MOUNT: Automount devtmpfs at /dev, after the kernel mounted the rootfs

General informations

The Linux kernel configuration item CONFIG_DEVTMPFS_MOUNT has multiple definitions:

Automount devtmpfs at /dev, after the kernel mounted the rootfs found in drivers/base/Kconfig

The configuration item CONFIG_DEVTMPFS_MOUNT:

• prompt: Automount devtmpfs at /dev, after the kernel mounted the rootfs
• type: bool
• depends on: CONFIG_DEVTMPFS
• defined in drivers/base/Kconfig
• found in Linux kernels: 2.6.34–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

This will instruct the kernel to automatically mount the devtmpfs filesystem at /dev, directly after the kernel has mounted the root filesystem. The behavior can be overridden with the commandline parameter: devtmpfs.mount=0|1. This option does not affect initramfs based booting, here the devtmpfs filesystem always needs to be mounted manually after the rootfs is mounted. With this option enabled, it allows to bring up a system in rescue mode with init=/bin/sh, even when the /dev directory on the rootfs is completely empty.

Automount devtmpfs at /dev found in drivers/base/Kconfig

The configuration item CONFIG_DEVTMPFS_MOUNT:

• prompt: Automount devtmpfs at /dev
• type: bool
• depends on: CONFIG_DEVTMPFS
• defined in drivers/base/Kconfig
• found in Linux kernels: 2.6.32–2.6.33

Help text

This will mount devtmpfs at /dev if the kernel mounts the root filesystem. It will not affect initramfs based mounting. If unsure, say N here.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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