On Fri, Jan 19, 2024 at 07:34:26PM +0100, Rafael J. Wysocki wrote: > On Fri, Jan 19, 2024 at 2:25 PM Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx> wrote: > > > > Store the state change reason to some black box for later investigation. > > Seriously? > > What black box, where, how this is useful and who is going to use it, > pretty please. The 'black box' refers to a non-volatile memory (NVMEM) cell used by the Power State Change Reasons (PSCR) framework. This cell stores reasons for sudden power state changes, like voltage drops or over-temperature events. This data is invaluable for post-mortem analysis to understand system failures or abrupt shutdowns. It's particularly useful for systems where PMICs or watchdogs cannot record such events. The data can inform recovery routines in the bootloader or early kernel stages during subsequent boots, enhancing system reliability and aiding in debugging and diagnostics. Regards, Oleksij -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
