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Firmware lookup order
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=====================
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Different functionality is available to enable firmware to be found.
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Below is chronological order of how firmware will be looked for once
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a driver issues a firmware API call.
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* The ''Built-in firmware'' is checked first, if the firmware is present we
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return it immediately
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* The ''Firmware cache'' is looked at next. If the firmware is found we
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return it immediately
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* The ''Direct filesystem lookup'' is performed next, if found we
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return it immediately
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* If no firmware has been found and the fallback mechanism was enabled
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the sysfs interface is created. After this either a kobject uevent
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is issued or the custom firmware loading is relied upon for firmware
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loading up to the timeout value.
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