26 lines
1.6 KiB
Markdown
26 lines
1.6 KiB
Markdown
# On-board Button
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!!! note
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All the above on-board buttons are also exposed on the [Front Panel](/helios64/front-panel/).
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## Power Button
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Helios64 board provides a POWER push button (SW1) to power ON/OFF the system. This button is connected to Power Management IC (PMIC) RK808-D. The following actions can be performed:
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* **Power ON** : Short press (~1 second) will turn on the system when the current state is power off.
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* **Power OFF** : Short press (~1 second) will inform system to perform graceful shutdown when the system is on.
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* **Force Power OFF** : Long press (~4 seconds) will signals PMIC to cut off the power in case of system not responding.
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## Reset Button
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Helios64 board provides a RESET push button (SW3) to hard reset the system.
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## Recovery Button
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Helios64 board provides a RECOVERY push button (SW2) to allow user to easily flash over USB the on-board eMMC storage. This can be useful if you want to do a fresh install or if you want to repair a system that doesn't boot anymore.
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User can enter recovery mode by pressing this button during boot up (bootloader stage). U-Boot will read the button state and switch the USB type-C port into USB Mass Storage device to expose eMMC flash as storage device. User can then use flash tools to write new OS image into eMMC flash.
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Under Linux, this button behaves as user button and when pressed will emit **BTN_0** keycode (refer to [Linux Input Codes](https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/plain/include/uapi/linux/input-event-codes.h)). Therefore this button can also be used to trigger other actions than recovery.
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