Build named firmware blobs into the kernel binary
configname: CONFIG_EXTRA_FIRMWARE
Linux Kernel Configuration
└─>Device Drivers
└─>Generic Driver Options
└─>Firmware loader
└─>Build named firmware blobs into the kernel binary
In linux kernel since version 2.6.27 (release Date: 2008-10-09)
Device drivers which require firmware can typically deal with
having the kernel load firmware from the various supported
/lib/firmware/ paths. This option enables you to build into the
kernel firmware files. Built-in firmware searches are preceded
over firmware lookups using your filesystem over the supported
/lib/firmware paths documented on CONFIG_FW_LOADER.
This may be useful for testing or if the firmware is required early on
in boot and cannot rely on the firmware being placed in an initrd or
initramfs.
This option is a string and takes the (space-separated) names of the
firmware files -- the same names that appear in MODULE_FIRMWARE()
and request_firmware() in the source. These files should exist under
the directory specified by the EXTRA_FIRMWARE_DIR option, which is
/lib/firmware by default.
For example, you might set CONFIG_EXTRA_FIRMWARE="usb8388.bin", copy
the usb8388.bin file into /lib/firmware, and build the kernel. Then
any request_firmware("usb8388.bin") will be satisfied internally
inside the kernel without ever looking at your filesystem at runtime.
WARNING: If you include additional firmware files into your binary
kernel image that are not available under the terms of the GPL,
then it may be a violation of the GPL to distribute the resulting
image since it combines both GPL and non-GPL work. You should
consult a lawyer of your own before distributing such an image.
NOTE: Compressed files are not supported in EXTRA_FIRMWARE.
having the kernel load firmware from the various supported
/lib/firmware/ paths. This option enables you to build into the
kernel firmware files. Built-in firmware searches are preceded
over firmware lookups using your filesystem over the supported
/lib/firmware paths documented on CONFIG_FW_LOADER.
This may be useful for testing or if the firmware is required early on
in boot and cannot rely on the firmware being placed in an initrd or
initramfs.
This option is a string and takes the (space-separated) names of the
firmware files -- the same names that appear in MODULE_FIRMWARE()
and request_firmware() in the source. These files should exist under
the directory specified by the EXTRA_FIRMWARE_DIR option, which is
/lib/firmware by default.
For example, you might set CONFIG_EXTRA_FIRMWARE="usb8388.bin", copy
the usb8388.bin file into /lib/firmware, and build the kernel. Then
any request_firmware("usb8388.bin") will be satisfied internally
inside the kernel without ever looking at your filesystem at runtime.
WARNING: If you include additional firmware files into your binary
kernel image that are not available under the terms of the GPL,
then it may be a violation of the GPL to distribute the resulting
image since it combines both GPL and non-GPL work. You should
consult a lawyer of your own before distributing such an image.
NOTE: Compressed files are not supported in EXTRA_FIRMWARE.