topic Shutdown command behavior of i.MX6 linux in i.MX Processors

Shutdown command behavior of i.MX6 linux

torus1000 — Tue, 12 Apr 2016 02:30:06 GMT

Hi,

Shutdown command (shutdown -h -P now) cause system boot if 5V still remained that is expected behavior.

I tried it was success at first time but it failed at 2nd time.

I cleared SRTC registers once for secure interrupt but nothing changed.

Why 2nd shutdown command ignored (no boot)?

Can anybody help me?

b36401 — Tue, 12 Apr 2016 10:39:00 GMT

Please try to use "shutdown -r now" instead of "-h".

Have a great day,

Victor

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torus1000 — Wed, 13 Apr 2016 08:29:06 GMT

Dear Victor

Yes, -r works fine but actually what I like to want is "20sec delayed" wake up.

Finally I found hwclock command solved this problem as following.

WRONG:

# shutdown -h now
...
# shutdown -h now

CORRECT:

# shutdown -h now
...
# hwclock -w
# echo 0 > /sys/class/rtc/rtc0/wakealarm
# echo +20 > /sys/class/rtc/rtc0/wakealarm
# shutdown -h now

Just in case, could you explain why such command is need?

Thank you for your kindness.