Contributed by jose on from the magic-boot-sequence dept.
I've seen a number of posts on how to get the unfortunate default power-saver state from 667mhz to 800mhz, in fact I was one of those posts on the OpenBSD list today. I spent half a day hacking openfirmware and was met with success. The following will do the trick. Boot into Openfirmware Type EXACTLY THE FOLLOWING (with spaces) nveditNow note that this is really experimental, and any OpenFirmware hacking you do can render your machine unusable (I did it to one of my machines years ago!). However, if you're feeling brave and desparate for speed, this may be something to look at." /cpus/PowerPC,G4@0" select-dev 2faf0800 " clock-frequency" get-my-property 2drop ! 00000000 " force-reduced-speed" get-my-property 2drop ! (Type Ctrl-C to exit editor) nvstore setenv use-nvramrc? true reset-all (Laptop will reboot, then enter normal boot hd command to boot {Open,Net}BSD) dmesg will now report 800mhz! :)
(Comments are closed)
By Ben Goren () ben@trumpetpower.com on http://www.trumpetpower.com/
I posted a similar message to misc@ earlier today, namely: just what is performance like with OpenBSD on the newer Apple hardware? How does it stack up against the other platforms?
Does this speed hack have a noticible difference? Was the system really slow before?
This is pure idle curiousity--I certainly can't afford any of the latest and greatest from Apple right now. Not that I don't want a dual G4 and one of those stupid-huge flatscreen displays....
Cheers,
b&
Comments
By jolan () on
Well, it's the difference between running at 667mhz and running at 800mhz.
This is for *laptops* as it clearly states in the article.
Basically, it's the same thing as Intel's speedstep technology where the machine runs at a lower speed to save power.
By deem0N () on
By Gilbert Fernandes () gilbertf@posse-press.com on mailto:gilbertf@posse-press.com
By Peter Hessler () spambox@theapt.org on http://www.sfobug.org
By AC () on
Comments
By Jimmy () on
i have snake in my openfirmware...
ypu just have to love the idea of
openfirmware with pram =)
may the forth be with us indeed.
/ Jimmy
By Mark Grimes () mark@openbsd.org on http://www.stateful.net/
the posting of this article, this hack did not
meet success. It was experimental and was an
initial stab at the problem. Wall clock times
and benchmark analysis will prove this point.
The real solution is horribly more complex:
http://mail-index.netbsd.org/port-macppc/2002/08/05/0002.html
(OpenBSD macppc users SHOULD read both lists, but
alas I did make an effort to crosspost the fact that
the initial hack did not work)