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To: Tim Kientzle <tim@kientzle.com>
Subject: Re: BeagleBone questions (was Re: Towards an ARM system-building
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In-reply-to: Your message of "Tue, 30 Oct 2012 23:01:12 PDT."
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Comments: In-reply-to Tim Kientzle <tim@kientzle.com>
 message dated "Tue, 30 Oct 2012 23:01:12 -0700."
Date: Wed, 31 Oct 2012 12:35:28 -0700
From: Bakul Shah <bakul@bitblocks.com>
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Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>,
 Alie Tan <alie@affle.com>
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On Tue, 30 Oct 2012 23:01:12 PDT Tim Kientzle <tim@kientzle.com>  wrote:
> 
> On Oct 30, 2012, at 9:20 AM, Adrian Chadd wrote:
> 
> > .. ah. armv5 has no sleep "halt" function, so it's just spinning.
> > Chances are that's a good candidate for why things are running too
> > warm.
> 
> RaspberryPi uses a Broadcom BCM2835 with an ARM1176JZF-S core (ARMv6).
> 
> BeagleBone uses a TI Sitara AM3358 with an ARM Cortex-A8 core (ARMv7).

See
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka13332.html

The method outlined here puts Rpi in low power standby mode,
waiting for an interrupt to wake it up. Haven't measured actual
power us in this mode.