From: Clemens Koller <clemens.koller@anagramm•de>
To: Kumar Gala <galak@kernel•crashing.org>
Cc: Marta Chamorro <Marta.Chamorro@xerox•com>,
linuxppc-embedded@ozlabs•org, linuxppc-dev@ozlabs•org
Subject: Re: Power management for ppc 85xx
Date: Sat, 09 Dec 2006 06:31:44 +0100 [thread overview]
Message-ID: <457A4A40.2060803@anagramm.de> (raw)
In-Reply-To: <5480D0D0-2F38-4BF1-B018-78E25D97F7B6@kernel.crashing.org>
Hello, Kumar, Hi, Marta!
>> Glad I managed to make sense. I checked the hardware spec on the board
>> and it looks like we're using everything, apart from the SEC and maybe
>> the stand-alone I2C (I think we're just using the one within the CMP).
>> By the way, I made a mistake and the actual processor on the board is
>> the cut-down 8541, not the 8555. My apologies for that.
>>
>> This morning I added some printks and confirmed that there is no code
>> behind pm_ops, so my question remains: is there some code out there
>> that
>> I can use? (hope so, otherwise I'm doomed...)
>
> I'm sorry to say you're doomed. I don't believe anyone's spent any
> time trying to do pwr mgmt on 85xx.
I am working with the MPC8540 in a mobile product and some
power saving would be fine to use. But I haven't seen any
power management code for that thingy in the kernels at all.
So, there is some work left there. Maybe I will have
a closer look in the future.
According to some tests of a board manufacturer, the cpu
doesn't power down very much, when you stop some peripherals
or send the core to nap. But I wasn't able to confirm that yet.
Best greets,
Clemens Koller
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next prev parent reply other threads:[~2006-12-09 5:37 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-06 21:06 Power management for ppc 85xx Chamorro, Marta
2006-12-06 21:50 ` Kumar Gala
2006-12-06 22:27 ` Chamorro, Marta
2006-12-06 22:53 ` Kumar Gala
2006-12-07 15:53 ` Chamorro, Marta
2006-12-07 15:56 ` Kumar Gala
2006-12-09 5:31 ` Clemens Koller [this message]
2006-12-12 15:17 ` Chamorro, Marta
2006-12-07 19:57 ` Chamorro, Marta
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