Wake up duo 256m after poweroff

Duo
1

Hi, all

could you please help me to figure out how to wake up duo256m after power off without reconnecting the power source?

Are there some pins which must be shorted to wake up? From what I have understood from data sheet, there are none, but I’m not good at understanding schematics at all )

Assume the following scenario:

  1. execute poweroff command. Duo will power off
  2. Do not disconnect the PSU
  3. Short the pins
  4. duo starts
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2

AFAIK, ARM or RISC-V cores in such an SoC either go deep sleep (wakeups are possible from low power cores — secondary or MCU), or stop. And in the second case you can’'t do a thing unless you power-cycle the whole system.

What you need, as I see it, is the first scenario: the first core goes to sleep until woken up by other cores or an interrupt.

3

Maybe you can do something with the 8051 core.

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4

Thank you guys. Simple power on/off button seems to be a much longer story than I expected. I planned to utilize gpiokeys and busybox acpid for safe power off, but hoped that wake up could be not so complex

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