CONFIG_FW_LOADER: Firmware loading facility

General informations

The Linux kernel configuration item CONFIG_FW_LOADER has multiple definitions:

Firmware loading facility found in drivers/base/firmware_loader/Kconfig

The configuration item CONFIG_FW_LOADER:

• prompt: Firmware loading facility
• type: tristate
• depends on: CONFIG_EXPERT
• defined in drivers/base/firmware_loader/Kconfig
• found in Linux kernels: 4.18–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD
• modules built: firmware_class, firmware_class

Help text

This enables the firmware loading facility in the kernel. The kernel will first look for built-in firmware, if it has any. Next, it will look for the requested firmware in a series of filesystem paths:

o firmware_class path module parameter or kernel boot param o /lib/firmware/updates/UTS_RELEASE o /lib/firmware/updates o /lib/firmware/UTS_RELEASE o /lib/firmware

Enabling this feature only increases your kernel image by about 828 bytes, enable this option unless you are certain you don't need firmware.

You typically want this built-in (=y) but you can also enable this as a module, in which case the firmware_class module will be built. You also want to be sure to enable this built-in if you are going to enable built-in firmware (EXTRA_FIRMWARE).

Userspace firmware loading support found in drivers/base/Kconfig

The configuration item CONFIG_FW_LOADER:

• prompt: Userspace firmware loading support
• type: tristate
• depends on: CONFIG_EXPERT
• defined in drivers/base/Kconfig
• found in Linux kernels: 2.6.16–2.6.39, 3.0–3.19, 4.0–4.17
• modules built: firmware_class, firmware_class

Help text

This option is provided for the case where none of the in-tree modules require userspace firmware loading support, but a module built out-of-tree does.

Hotplug firmware loading support found in drivers/base/Kconfig

The configuration item CONFIG_FW_LOADER:

• prompt: Hotplug firmware loading support
• type: tristate
• depends on: (none)
• defined in drivers/base/Kconfig
• found in Linux kernels: 2.5.73–2.5.75, 2.6.0–2.6.15
• modules built: firmware_class, firmware_class

Help text

This option is provided for the case where no in-kernel-tree modules require hotplug firmware loading support, but a module built outside the kernel tree does.

Hardware

LKDDb

Raw data from LKDDb:

• lkddb module firmware_class CONFIG_FW_LOADER : drivers/base/Kconfig : "Userspace firmware loading support" # in 2.5.73–2.5.75, 2.6.0–2.6.39, 3.0–3.19, 4.0–4.17
• lkddb module firmware_class CONFIG_FW_LOADER : drivers/base/firmware_loader/Kconfig : "Firmware loading facility" # in 4.18–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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