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