Hello John, thank you for your answer.
On Sun, Mar 20, 2005 at 03:45:53PM +1030, John Steele Scott wrote: > There is not really any proper documentation about this stuff, but > the source code for Darwin is available on the Apple developer web > site, so you can see exactly what they do. The package that deals > with this stuff used to be called AppleMacRISC2PE. I wanted to do so, but I found out that Apple's stuff is published under a license which is incompatible with the GPL. Then I was worried about tainting my brain with GPL-incompatible stuff which would prevent me from contributing my fixes to the kernel. Isn't this a problem. If I read Apple's source, see how it works, and rephrase the result in my own "words" (well, code), would this be ok then? > A simpler way is to find the code in your open > firmware which knows how to change the frequency. On the iBook G4 I > have, this is at /cpus/PowerPC,[EMAIL PROTECTED], I have set-dfs-high, > set-dfs-low. Sorry, no such luck for me. The command find /proc/device-tree -name "*dfs*" finds nothing. > If you look back at the linux-ppc-dev archives from May 2004, there are some > posts there about it. There may be some clues there. Ok, I will have a look. Is this list the place where I should have sent my question? > So far we have been assuming that the new PowerBooks behave the same > as the older ones with the 7447A chip. If this is true, then I would > suggest starting with a known good kernel ... I will give this a try. > I think what you have suggested (cpu doesn't like going high speed without > elevated voltage) makes the most sense. Do you know whether I can read the current voltage setting using the following call? pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, voltage_gpio, 0) Would I expect the return value 5 or 1 for high voltage or does reading not work like this. I always get 0, even after I did pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 5) > In one of your previous posts, you mentioned something in > pmac_feature.c ... Ok, I will have a look, too. All the best and many thanks, Jochen -- http://seehuhn.de/
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