From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: nearly-working support for cpufreq on 2004 iBook G4 with 7447A cpu From: Benjamin Herrenschmidt To: John Steele Scott Cc: linuxppc-dev list , Christiaan Welvaart In-Reply-To: <200405302331.35357.toojays@toojays.net> References: <200405302331.35357.toojays@toojays.net> Content-Type: text/plain Message-Id: <1085956980.9638.17.camel@gaston> Mime-Version: 1.0 Date: Mon, 31 May 2004 08:43:00 +1000 Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: On Mon, 2004-05-31 at 00:01, John Steele Scott wrote: > Hi all, > > I have written a patch against kernel 2.6.6 which lets the pmac cpufreq driver > support dynamic frequency scaling on the 7447A cpu in my new iBook. It also > fixes the incorrect clock speed reporting (i.e. on boot 2.6.6 reports cpu is > running at 1066 MHz when really it is 533 MHz). OF is probably not reporting wrong frrequency, check your bogomips. I suspect your clock chip isn't configured properly at boot, like with other newer models. I need to hack the proper bits in. I'll have a look at this asap. > Unfortunately, if I use this to set my cpu frequency up to 1 GHz, my system > locks up hard when I try and do something cpu-intensive. Christiaan Welvaart > has tested the previous version of this patch (functionally the same, but a > bit messier), and on his system it works fine. Yet even if I use the exact > same kernel as him, my system locks up. Both systems are 1 GHz, 12" iBooks. > > Does anyone have any ideas on why this might not work on my system? Is there > something else that needs to be looked at when increasing the frequency after > booting? You might need the proper clock chip tweaks. Ben. ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/