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Date: Sun, 16 May 2010 23:38:22 +0200
From: Marius Strobl <marius@alchemy.franken.de>
To: Nathan Whitehorn <nwhitehorn@freebsd.org>
Message-ID: <20100516213822.GA49967@alchemy.franken.de>
References: <201005161557.o4GFv0Lf046659@svn.freebsd.org>
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
	src-committers@freebsd.org
Subject: Re: svn commit: r208152 - in head/sys: dev/ofw powerpc/aim
	powerpc/ofw
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On Sun, May 16, 2010 at 03:57:00PM +0000, Nathan Whitehorn wrote:
> Author: nwhitehorn
> Date: Sun May 16 15:56:59 2010
> New Revision: 208152
> URL: http://svn.freebsd.org/changeset/base/208152
> 
> Log:
>   On PowerMac11,2 and (presumably) PowerMac12,1, we need to quiesce the
>   firmware in order to take over control of the SMU. Without doing this,
>   the firmware background process doing fan control will run amok as we
>   take over the system and crash the management chip.
>   
>   This is limited to these two machines because our kernel is heavily
>   dependent on firmware accesses, and so quiescing firmware can cause
>   nasty problems.
> 

Given that the "quiesce" service isn't part of the Open Firmware
standard nor of one of its supplements as far as I can see and
given this service isn't available on sun4u I'd prefer this
implementation to be entirely moved to MD parts instead (similar
to the "SUNW,<foo>" services which we keep MD).

Marius