svn commit: r191674 - in head/sys/dev/ata: . chipsets

[Alexander Leidinger]

Quoting Alexander Motin <mav at FreeBSD.org> (from Wed, 17 Jun 2009  
16:10:25 +0300):

> Alexander Leidinger wrote:
>> Quoting Alexander Motin <mav at FreeBSD.org> (from Wed, 29 Apr 2009
>> 21:17:18 +0000 (UTC)):

>>>   PARTIAL state has up to 100us (50us for me) wakeup latency, but for my
>>>   ICH8M saves 0.5W of power per drive. SLUMBER state has up to 10ms
>>> (3.5ms
>>>   for me) wakeup latency, but saves 0.8W of power.
>>>
>>>   Modes 2 and 3 are implemented only for AHCI driver now.
>>
>> Does this mean it is for SATA devices only, or is this a feature of the
>> complete controller (ICH5 in my case) and also works with PATA drives?
>
> This feature is SATA-specific by definition. AFAIK there is no bus power
> management in PATA.

What happens if such a setting is made for a pata channel, will the  
system ignore it? The idea of the question is: can I just add those  
hints for all my ata channels on a remote system without getting into  
trouble?

Bye,
Alexander.

-- 
While you're chewing, think of STEVEN SPIELBERG'S bank account ...  his
will have the same effect as two "STARCH BLOCKERS"!

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