Documentation/driver-api/firmware/fw_search_path.rst

Source file repositories/reference/linux-study-clean/Documentation/driver-api/firmware/fw_search_path.rst

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Linux kernel
Corpus path
Documentation/driver-api/firmware/fw_search_path.rst
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.rst
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1081 bytes
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32
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: documentation
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atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

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=====================
Firmware search paths
=====================

The following search paths are used to look for firmware on your
root filesystem.

* fw_path_para - module parameter - default is empty so this is ignored
* /lib/firmware/updates/UTS_RELEASE/
* /lib/firmware/updates/
* /lib/firmware/UTS_RELEASE/
* /lib/firmware/

The module parameter ''path'' can be passed to the firmware_class module
to activate the first optional custom fw_path_para. The custom path can
only be up to 256 characters long. The kernel parameter passed would be:

* 'firmware_class.path=$CUSTOMIZED_PATH'

There is an alternative to customize the path at run time after bootup, you
can use the file:

* /sys/module/firmware_class/parameters/path

You would echo into it your custom path and firmware requested will be searched
for there first. Be aware that newline characters will be taken into account
and may not produce the intended effects. For instance you might want to use:

echo -n /path/to/script > /sys/module/firmware_class/parameters/path

to ensure that your script is being used.

Annotation

Implementation Notes