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== Introduction == | == Introduction == | ||
The blue and red [[LEDs and buttons on STM32 MPU boards|LEDs on STM32MP15 boards]] are used to notify the user in case of boot failure during the [[Boot | The blue and red [[LEDs and buttons on STM32 MPU boards|LEDs on STM32MP15 boards]] are used to notify the user in case of boot failure during the [[Boot chain overview|boot chain]] execution and at runtime.<br /> | ||
== Description and debug == | == Description and debug == | ||
The statuses of blue and red LEDs allow to see at which stage the execution failed: the diagram below shows how each boot component uses these LEDs while the table gives more information on the way to interpret the LED statuses when the boot fails. Among the boot components, the FSBL can be TF-A or U-Boot SPL and the SSBL is U-Boot, as explained in the [[Boot | The statuses of blue and red LEDs allow to see at which stage the execution failed: the diagram below shows how each boot component uses these LEDs while the table gives more information on the way to interpret the LED statuses when the boot fails. Among the boot components, the FSBL can be TF-A or U-Boot SPL and the SSBL is U-Boot, as explained in the [[Boot chain overview|boot chain overview]]. | ||
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Revision as of 11:29, 25 September 2020
1. Introduction[edit | edit source]
The blue and red LEDs on STM32MP15 boards are used to notify the user in case of boot failure during the boot chain execution and at runtime.
2. Description and debug[edit | edit source]
The statuses of blue and red LEDs allow to see at which stage the execution failed: the diagram below shows how each boot component uses these LEDs while the table gives more information on the way to interpret the LED statuses when the boot fails. Among the boot components, the FSBL can be TF-A or U-Boot SPL and the SSBL is U-Boot, as explained in the boot chain overview.
| Blue LED | Red LED | System state | Action |
|---|---|---|---|
| Off | Blinking | The execution failed during ROM code execution | Check that:
|
| On | Blinking | The execution failed during the second stage bootloader (SSBL) | See U-Boot - How to debug to investigate the failure |
| Off | Off | The execution may have failed:
|
|
| Off or on | Off | The execution may have failed during Linux® kernel execution between two heartbeat pulses (blue LED): a fatal error leading to a kernel panic might have occurred... | See How to debug a Linux kernel crash to investigate the failure |
| Blinking | Off | Your platform is alive | Enjoy ! |