Uwe Klein wiederling at googlemail.com
Wed Aug 20 10:23:55 CEST 2008

On 8/19/08, Joerg Reisenweber <joerg at openmoko.org> wrote:

> This power removal is done by U1705, and it should relyably cut power when we
>  disable IO_3V3 what is quite normal for shutoff.
>  No special kernel action required.

This is in a lot of cases a faulty assumtion.

Depending on the internal setup of the  IO pins the chip is fed
via the protective diodes on each IO.

This will lead to very inpredictable behaviour when powering back on.

With some ICs even the dedicated reset pin is not able to do
a proper reset due to internal lockup.


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