5 comments:
Patch Set #1, Line 9: shutdown
shuts down […]
In atf code, RTC will switch clock source from dcxo to eosc before real shutdown. So we need to switch it back at next boot.
When system shutdown, RTC enable eosc calibration feature to save
power.
… This will reduce the RTC clock source accuracy. […]
At eosc calibration mode, RTC bias is within 63.4ppm which dcxo is within 2ppm.
Patch Set #1, Line 11: a more accurate one
Which one?
Done
Patch Set #1, Line 11: boot up
boot
Done
How much power is saved?
This eosc calibration mode saved about 200uA power.
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