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The Dragonwing IQ-9075 EVK has status LEDs that monitor system functions such as power-on and board faults, which are useful for debugging and bring-up.

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LED Indicators

The mainboard includes several LEDs that provide visual feedback for system status, power regulation, and debugging.
Reference DesignatorLocationColorFunction
DS1MainboardGreenReserved for debugging
DS8MainboardGreenEthernet status LED
DS9MainboardGreenEthernet status LED
DS10MainboardGreenVREG_3P3_SIP indicator
DS11MainboardOrangeVREG_3P3_SIP indicator
LED1MainboardGreenSoftware-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).

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Boot Sequence

Boot StageLED 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.
BootloaderLED1 may show a static color (default green) if configured in bootloader. Ethernet LEDs remain OFF.
Kernel InitializationLED1 becomes software-controllable. Ethernet LEDs (DS8, DS9) start blinking once network drivers load.
OS ReadyLED1 can display custom patterns. DS8/DS9 indicate link/activity status.

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Troubleshooting

Possible cause: Debug mode stuck or firmware issue.Action: Power cycle the board. If the issue persists, reflash the bootloader or check debug logs.
Possible cause: Ethernet link not established or driver failure.Action: Check the Ethernet cable and port. Verify network configuration and reload network drivers.
Possible cause: 3.3V regulator not enabled.Action: Inspect power rails. Check PMIC configuration and verify boot logs for regulator errors.
Possible cause: Regulator fault or overcurrent condition.Action: Disconnect peripherals, measure voltage, check PMIC fault registers. Replace board if the issue persists.
Possible cause: GPIO control not initialized.Action: Confirm GPIO driver is loaded. Check software configuration and test with manual GPIO toggling.