From: August Hoerandl <ahoerandl@gmx.at>
To: linuxppc-embedded@lists.linuxppc.org
Subject: Re: power saving
Date: Thu, 10 May 2001 12:36:12 +0200 [thread overview]
Message-ID: <01051012361202.02674@linuxhoe> (raw)
In-Reply-To: <3AF6FC60.D5FE49D9@mvista.com>
On Monday 07 May 2001 09:49 pm, Dan Malek wrote:
> Tania Oka wrote:
> > I would like to reduce power consumption on a custom MPC855T board.
>
> This has been asked before, and you can read about it in mailing
> list archives.
checked this - found nothing very specific
> Basically, the MPC8xx processors have a dynamic power management
> system that doesn't gain much from just doing something in the idle()
> loop. The majority of the power is consumed by peripherals. If they
> are not enabled, they automatically power down. All of the MPC8xx
> drivers "do the right thing" on open and close to power up/down
> peripherals.
>
> If you have some very low power standby requirement, you need to add
> lots of power management software to do things like power down/up
> any external peripherals on your board, put DRAM in autorefresh
> mode, shut down the clocks and put the processor into a deep sleep.
yes - thats what i would like to do ;-)
> You could look at some of the PowerMac power management code for
> design ideas.
could anyone be a little more specific to get me to the right files ?
Regards
Gustl
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
prev parent reply other threads:[~2001-05-10 10:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-05-07 5:54 power saving Tania Oka
2001-05-07 19:49 ` Dan Malek
2001-05-10 10:36 ` August Hoerandl [this message]
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