On 05/16/10 16:47, Nathan Whitehorn wrote:
On 05/16/10 16:38, Marius Strobl wrote:
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).
This is tricky on PowerPC, because there are 3 OF implementations in
use (native virtual-mode, 32-bit virtual mode, and 32-bit real mode),
and it has to go in all of them. I'll try to come up with a
non-horrible way to put this in the MD code, and I won't MFC this
change in the meantime.
-Nathan
Immediately after writing this, I realized I had tricked myself into
thinking it was hard. Since this is called very early on, in the context
set up by Open Firmware, none of those distinctions matter. It's been
pulled back in to PPC-specific code in revision 208172.
-Nathan
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