Joerg Sommer <joerg@alea.gnuu.de> writes: > John Steele Scott <toojays@toojays.net> wrote: >> the ICTC. Try some small odd values like 3 or 7 and see what happens. The >> information on ICTC usage is from "MPC7450 RISC Microprocessor Family User's >> Manual", section 10.3. > > I found this document: > http://www-3.ibm.com/chips/techlib/techlib.nsf/techdocs/2EF555D341769CE787256E470077DD3D/$file/750gx_um_pub.pdf Ah, I didn't realise that the IBM chips had ICTC as well. My code checks the chip type in ict_init. Currently it will only run on the 7450 based CPUs. I referenced the Motorola datasheet because I have a G4; I had not looked at the IBM one before. What CPU are you using? >> I also started a Wiki page about power consumption on the iBook G4, but >> currently it has no really new information. > > Where? <http://www.toojays.net/portal/Wiki/IBookG4PowerConsumption> I am quite happy for other people to create their own accounts and add more info. > In the IBM document I read you need to set HID0[DPM] = 1. I don't know, > if this is currently done. It's done in linux/arch/ppc/kernel/cpu_setup_6xx.S, except for the CPUs which are listed as CPU_FTR_NO_DPM in linux/arch/ppc/kernel/cputable.c. This includes a couple of 750FX revisions. > Do you know how to read the ictc register in OSX? I don't really know anything about OSX. I guess you would need to make some kind of kernel module, so you can execute code in kernel mode, like you do in Linux. cheers, John
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