On 2022-06-28 16:04, Shashank Anand wrote:

Hi Genodians,

On x86, the acipica component enables shutdown and reboot of the device. I was however unable to find any related component in the genode repo for power management on ArmV8

The PSCI functions are a convenient way for power management in ArmV8. The base-hw kernel already provides a PSCI implementation of cpu_on and cpu_off and it is trivial to implement the other PSCI functions as well. I am particularly interested in system reset.

I would like to perform a system reset from a user space component, however PSCI requires kernel privileges. Would it be possible to expose the PSCI system reset service to a specific component? How feasible is this modification with respect to the structure of base-hw?

Regards,

Shashank

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Hi Genodians,

Regarding resetting the IMX8MM board, I have found a better solution that does not require kernel privilege. The board can be reset by clearing the WDA bit of the Watchdog Control Register (WDOG1_WCR). Clearing the WDA bit triggers the WDOG_B signal which performs a system reset.

Regards,

Shashank