svn commit: r208152 - in head/sys: dev/ofw powerpc/aim powerpc/ofw

[Nathan Whitehorn]

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