current focus / Removing PMU problem in future

Werner Almesberger werner at
Fri Jul 11 15:36:32 CEST 2008

Andy Green wrote:
> We would need to hit SHUTDOWN or something within some tens of ms to
> stop it trying to power up completely from USB insert,

Oh, just come out of reset quickly and switch off the FETs. Before
the PMU has left reset, it won't listen to I2C anyway, so everything
that could be trouble (AUTO, maybe BAT) needs to be controlled
directly anyway.

> And VB_SYS has the big advantage it
> is already "mixed" from the power sources.

Yeah ! :-)

> That's a whole other (zombie) battle :-)

Let's see how the next round of that one will go, in light of the
case for the MPU getting stronger.

It actually went pretty much like we predicted: we couldn't tell
any specific problem the MPU would solve, but we were sure that
it would eventually appear. And so it did, even earlier than we

Cheers, Werner

More information about the openmoko-kernel mailing list