1 ===================== 2 Firmware lookup order 3 ===================== 4 5 Different functionality is available to enable firmware to be found. 6 Below is chronological order of how firmware will be looked for once 7 a driver issues a firmware API call. 8 9 * The ''Built-in firmware'' is checked first, if the firmware is present we 10 return it immediately 11 * The ''Firmware cache'' is looked at next. If the firmware is found we 12 return it immediately 13 * The ''Direct filesystem lookup'' is performed next, if found we 14 return it immediately 15 * The ''Platform firmware fallback'' is performed next, but only when 16 firmware_request_platform() is used, if found we return it immediately 17 * If no firmware has been found and the fallback mechanism was enabled 18 the sysfs interface is created. After this either a kobject uevent 19 is issued or the custom firmware loading is relied upon for firmware 20 loading up to the timeout value.
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