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In the schematic on Radxas site[1] there is no connection between the RP2040 and the power circuit, I would love to be able to shutdown the Intel chip from the Raspberry Pi microchip. Seems far fetched that it would be hackable if this is not a feature, I'm guessing the power chips are a lot more complicated and undocumented than a RP2040.

[1] page 22 https://dl.radxa.com/x/x4/radxa_x4_v1.11_schematic.pdf

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You do not need a hardware means for the RP2040 to shutdown the SBC.

You can run on the N100 a program that would monitor continuously the RP2040, e.g. by reading periodically the state of a GPIO pin or of a variable in the internal memory. Such a program can shutdown all the SBC.

While this is true, it misses most usecases, since you need cooperation from the Intel chip and you cannot start it up again after it shut down

I suppose the usecase would be a "poor man's IPMI", a separate chip dedicated to monitoring the main system, with the ability to power if off and on.

Sadly most(?) x86 systems don't offer a non-visual way to access BIOS/UEFI settings (like ARM boards usually do with uBoot over serial), so the utility of such monitoring without video input is limited, but just being able to remotely reset a system via a built-in chip would be very useful.

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