LED - Qualcomm Dragonwing Documentation

LED Indicators

The mainboard includes several LEDs that provide visual feedback for system status, power regulation, and debugging.

Reference Designator	Location	Color	Function
DS1	Mainboard	Green	Reserved for debugging
DS8	Mainboard	Green	Ethernet status LED
DS9	Mainboard	Green	Ethernet status LED
DS10	Mainboard	Green	VREG_3P3_SIP indicator
DS11	Mainboard	Orange	VREG_3P3_SIP indicator
LED1	Mainboard	Green	Software-controlled RGB lighting through GPIOs

DS1 — Not active during normal operation. Intended for internal development and troubleshooting.

DS8 — Indicates link and activity status for the Ethernet interface. When lit, the Ethernet port is active; blinking denotes data transmission.

DS9 — Functions similarly to DS8, typically associated with a second Ethernet interface or dual-port configuration.

Ethernet LEDs (DS8 & DS9) follow standard Ethernet signaling conventions: solid green for link established, blinking for activity.

DS10 — Shows that the 3.3V system-in-package voltage regulator is enabled and supplying power correctly (PS_HOLD signal).

DS11 — Provides an alternate visual cue for the same voltage rail as DS10, often used to indicate a fault or secondary state (e.g., standby or error).

Voltage regulator LEDs (DS10 & DS11): green indicates normal operation; orange may indicate a warning or alternate state depending on firmware configuration.

LED1 — Connected to GPIO pins, allowing software to control LED color and behavior for status indication or user-defined patterns. Can be programmed via GPIOs 17 (red), 56 (green), and 57 (blue).

Boot Sequence

Boot Stage	LED Behavior
Power-On Self-Test (POST)	DS10 (Green) ON — stable 3.3V supply. DS11 (Orange) ON — no fault detected. DS1 may blink briefly for debug checks.
Bootloader	LED1 may show a static color (default green) if configured in bootloader. Ethernet LEDs remain OFF.
Kernel Initialization	LED1 becomes software-controllable. Ethernet LEDs (DS8, DS9) start blinking once network drivers load.
OS Ready	LED1 can display custom patterns. DS8/DS9 indicate link/activity status.

Troubleshooting

DS1 (Debug) — LED remains ON continuously

Possible cause: Debug mode stuck or firmware issue.Action: Power cycle the board. If the issue persists, reflash the bootloader or check debug logs.

DS8 / DS9 (Ethernet) — LED OFF after OS boot

Possible cause: Ethernet link not established or driver failure.Action: Check the Ethernet cable and port. Verify network configuration and reload network drivers.

DS10 (Green – VREG_3P3_SIP) — LED OFF during power-on

Possible cause: 3.3V regulator not enabled.Action: Inspect power rails. Check PMIC configuration and verify boot logs for regulator errors.

DS11 (Orange – VREG_3P3_SIP) — LED ON during normal boot

Possible cause: Regulator fault or overcurrent condition.Action: Disconnect peripherals, measure voltage, check PMIC fault registers. Replace board if the issue persists.

LED1 (RGB via GPIO) — No color change after OS boot

Possible cause: GPIO control not initialized.Action: Confirm GPIO driver is loaded. Check software configuration and test with manual GPIO toggling.

​LED Indicators

​Boot Sequence

​Troubleshooting

LED Indicators

Boot Sequence

Troubleshooting