LEDs (HMM)
Overview⚓︎
This platform has four red, green and yellow light-emitting diodes (LEDs).
LEDs are used to indicate system flashing.
LED 1 will be yellow when entering u-boot and green when leaving. The same LED is then set up with a heartbeat trigger from device tree and blink in green light to indicate that the system is running.
The following LEDs are available⚓︎
| Name | Overlay Typical Name | Default mode |
|---|---|---|
| green:LED_1 | A | Heartbeat |
| red:LED_1 | A | Off |
| green:LED_2 | B | Off |
| red:LED_2 | B | Off |
| green:LED_3 | C | Off |
| red:LED_3 | C | Off |
| green:LED_4 | D | Off |
| red:LED_4 | D | Off |
Default front⚓︎
Overlay illustration (HM020-003711, HM020-010411)
- 🟢 D
- 🟢 C
- 🟢 B
- 🟢 A
System built in modes⚓︎
| Stage | LED 4 (Top) | LED 3 | LED 2 | LED 1 (Bottom) |
|---|---|---|---|---|
| Power On | 🟡 | 🟡 | 🟡 | 🟡 |
| Booting U-Boot | ⚫ | ⚫ | ⚫ | 🟡 |
| Bootscript(load bootfs) | ⚫ | ⚫ | ⚫ | ⚫ |
| Flashing Mode(initial USB*) | ⚫ | ⚫ | ⚫ | ⚫ |
| File Load OK | ⚫ | 🟢 | ⚫ | ⚫ |
| File Load Fail(USB*) | ⚫ | 🔴 | ⚫ | ⚫ |
| Flash Success | 🟢 | 🟢 | ⚫ | ⚫ |
| Booting Linux | ⚫ | 🟢 | ||
| Linux Running | ⚫ | ⚫ | ⚫ | 🟢/⚫(blinking) |
| - *USB= Flashing with USB memory stick |