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- =================
- Built-in firmware
- =================
- Firmware can be built-in to the kernel, this means building the firmware
- into vmlinux directly, to enable avoiding having to look for firmware from
- the filesystem. Instead, firmware can be looked for inside the kernel
- directly. You can enable built-in firmware using the kernel configuration
- options:
- * CONFIG_EXTRA_FIRMWARE
- * CONFIG_EXTRA_FIRMWARE_DIR
- There are a few reasons why you might want to consider building your firmware
- into the kernel with CONFIG_EXTRA_FIRMWARE:
- * Speed
- * Firmware is needed for accessing the boot device, and the user doesn't
- want to stuff the firmware into the boot initramfs.
- Even if you have these needs there are a few reasons why you may not be
- able to make use of built-in firmware:
- * Legalese - firmware is non-GPL compatible
- * Some firmware may be optional
- * Firmware upgrades are possible, therefore a new firmware would implicate
- a complete kernel rebuild.
- * Some firmware files may be really large in size. The remote-proc subsystem
- is an example subsystem which deals with these sorts of firmware
- * The firmware may need to be scraped out from some device specific location
- dynamically, an example is calibration data for some WiFi chipsets. This
- calibration data can be unique per sold device.
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