Date: Tue, 30 Oct 2012 18:42:36 +0800 From: Alie Tan <alie@affle.com> To: Ian Lepore <freebsd@damnhippie.dyndns.org> Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: BeagleBone questions (was Re: Towards an ARM system-building script) Message-ID: <CANuCnH_Dc1XWUmhHmmpOHTGy%2Bjh5AjuVrOzVKE-QA=3zjfTDRA@mail.gmail.com> In-Reply-To: <1351550400.1123.364.camel@revolution.hippie.lan> References: <CANuCnH-Y_Bixer7s5EEU4sJVjRC7s3QQbpJeevdXTpxS2K0OqA@mail.gmail.com> <2E208EEB-B2CF-4AC6-B420-03FB4CF08041@freebsd.org> <1351522908.1123.356.camel@revolution.hippie.lan> <CANuCnH9KcRvp2yKeKg6Tp%2Ba2tZLc7RdhRzQiQ9C2VDcHZwAEEg@mail.gmail.com> <CAJ-VmokQmJbr0P4xp9PHHXC5_q0Fte18atvQu28QX%2B2oZiYmrw@mail.gmail.com> <1351550400.1123.364.camel@revolution.hippie.lan>
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On Tue, Oct 30, 2012 at 6:40 AM, Ian Lepore <freebsd@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@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 > > >
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