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1=====================2Firmware lookup order3=====================4 5Different functionality is available to enable firmware to be found.6Below is chronological order of how firmware will be looked for once7a driver issues a firmware API call.8 9* The ''Built-in firmware'' is checked first, if the firmware is present we10 return it immediately11* The ''Firmware cache'' is looked at next. If the firmware is found we12 return it immediately13* The ''Direct filesystem lookup'' is performed next, if found we14 return it immediately15* The ''Platform firmware fallback'' is performed next, but only when16 firmware_request_platform() is used, if found we return it immediately17* If no firmware has been found and the fallback mechanism was enabled18 the sysfs interface is created. After this either a kobject uevent19 is issued or the custom firmware loading is relied upon for firmware20 loading up to the timeout value.21