BeagleBone questions (was Re: Towards an ARM system-building script)

[Alie Tan]

On Tue, Oct 30, 2012 at 6:40 AM, Ian Lepore
<freebsd at damnhippie.dyndns.org>wrote:

> On Mon, 2012-10-29 at 09:14 -0700, Adrian Chadd wrote:
> > On 29 October 2012 08:08, Alie Tan <alie at affle.com> wrote:
> > > I have tried angstrom, ArchLinux and FreBSD. Only FreeBSD makes the
> > > chip/board quite hot.
> > >
> > > Anyone have same experiece?
> >
> > Are we not halting the CPU during idle ticks on ARM?
> >
> > Does Linux have some extra power management code for ARM that we don't?
>
> I'm not sure all arm SoCs we support have the ability to do this well
> (or at all).  I know for sure the atmel chips can do it, and we don't
> use that abillity.  We're pretty poor on power management in general in
> the atmel world.  I mean poor, like we turn on all on-chip devices early
> in kernel init and leave them that way, even the ones we don't have
> drivers for.  A comment in the code labels that a "temporary hack" but
> it's been that way for 5 years.
>
> More directly on the OP's point, I wonder if the combo of the system not
> fully booting and too much heat imply that something has gone into a
> tight loop somewhere.
>
Is there any way to debug/detect this issue?
I cant see any heavy processes from 'top'

>
> -- Ian
>
>
>