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avg@freebsd

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  1. Yes, I am seeing the same with Armbian 20.05.4 Focal (Linux 5.4.45-sunxi). At this point I think that the closest to soft poweroff would be some sort of custom firmware indeed. The firmware would put a system into a deepest sleep state possible. If it's ever woken up then it would reset the system. I see some code in linux-sunxi repo that does something like that. It looks like it copies some special code to a special address in SRAM (?). Probably that code gets run to handle a wake-up or something like that. I cannot find that code in the modern linux kernel.
  2. I wonder how it does that. AFAICT, boards like Orange Pi PC Plus do not have any power management unit (e.g., something like AXP209). Also, I do not see any PSCI support for shutdown. No GPIO shutdown either. There does not seem to be a syscon poweroff method too. I looked at various drivers under drivers/reset and beyond and I could not find anything that would be compatible with Orange Pi H3-based boards. So, I am very curious what mechanism Linux or Armbian uses for powering off on those boards .
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