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@lanodan From my understanding, most RISC-V specifications (including SBI) don't expect any kind of input devices or special shortcuts.

So any kind of SysRQ-magic is just using the default input driver from the kernel. This is what Linux does at least.

It's possible that a device has an interrupt source for this use-case - check the device tree. Though I'm not very familiar with RV hardware, no idea if there exists a board with such a feature.