From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin Herrenschmidt To: Cc: Joseph Garcia , Francois Felix Ingrand , Subject: Re: Pismo battery support (was 'Re: Debian pmud package available') Date: Wed, 7 Jun 2000 09:55:01 +0200 Message-Id: <20000607075501.32213@mailhost.mipsys.com> In-Reply-To: <393DF504.B7F839F8@jvc.nl> References: <393DF504.B7F839F8@jvc.nl> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: On Wed, Jun 7, 2000, Stephan Leemburg wrote: >FYI, in 2.2.16pre4, there is NO support for letting the Pismo and the >iBook sleep. It is however, as proven by the discussed battery monitors, >possible to get some info on the battery status. Supporting the KEYLARGO >is no trivial task, first of all, you need to have a iBook or Pismo to >experiment with and then get your hands dirty on trial and error kernel >modifications. I'm the happy owner of a Pismo since one or two weeks. Implementing sleep on this machine (and on the iBook) is on my to-do list (I already gathered various infos on KeyLargo from the Darwin sources and some MacOS hacking). I will first work on improving the gmac driver, which seems to be more urgent, and then work on that sleep support. >As I don't own a iBook or a Pismo, I cannot experiment with it and >experimenting over the net - that is one person writing the testcode and >the other testing it on a KEYLARGO based machine - is far to >inconvenient and will most probably not work. > >For what that experimenting is concerned, I believe that in the latest >Darwin kernel there is some powermanagement code, which could be analysed. It's still not complete, but there are interesting bits scattered here or there. The basic mecanism seems to be the same as for the wallstreet and lombard: the CPU is powered OFF by the PMU after entering a special sleep-loop. We need to fix this sleep-loop so that it resist to spurrious wake-ups by the decrementer interrupt, but that's a detail. The different thing is the way things are powered off before sleep and turned back on after sleep. It's a lot different for KeyLargo that it was for Heathrow and Paddington, but Darwin source is helpful here. I plan to rework (again) the arch/ppc/kernel/features.c stuffs to add more abstractions that match keylargo and uni-north new FCRs and power control. >Note that even though you cannot put the machines to sleep, you can have >pmud signal init that there is a powerfailure and have it shutdown... > ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/