Whoops, it is actually a 750GX, not 750FX, if that makes any difference.

So running the processor at its rated 1GHz is impossible right now?

Francis

On 7/12/05, Chris Tribo <ctribo@dtcc.edu> wrote:
> AFAIK, the 750FX needs support for CPU frequency scaling in the
> kernel which we do not yet support, and then a sysctl or userland
> program to activate it. It hasn't really been a priority as we don't
> support power and thermal management to the extent needed for a
> laptop to be allowed to go into high speed mode without damaging the
> computer and/or processor.
>=20
> On Jul 12, 2005, at 6:35 AM, Francis Koclas wrote:
>=20
> > I recently gave my trusty old PowerMac 7300 new guts, by buying a 1GHz
> > Powerlogix G3 cpu upgrade. That CPU is a 1GHz IBM PPC 750FX, with 1MB
> > level2 cache running at 1:1. (got it at OWC)
> >
> > It did give the 7300 an incredible speed bost (judging by some testing
> > I did under Mac OS 9 and Linux)
> >
> > I managed to get NetBD 2.0.2 running on it (2.0.2 ISO is not bootable
> > on OF 1.0.5 machines at the moment). To do that, I had to burn an
> > ISO-9660 CD-R with the 2.0.2 install kernel and the ofwboot.xcf file,
> > and then boot scsi-int/sd@3:,\OFWBOOT.XCF NETBSD.GZ. That worked fine,
> > thankfully. (It's really the only way to go on those machines, boot
> > floppies NEVER worked in my experience, and its much easier than doing
> > a netboot.)
> >
> > Noticing the level2 cache wouldn't activate, I came upon posts
> > about L2CR..
> >
> > I managed to make my own config and put it in my kernel :
> > options    L2CR_CONFIG=3D"(L2SIZ_1M|L2CLK_10|L2RAM_PIPELINE_BURST)"
> >
> > This worked fine, as I now get this :
> >
> > cpu0 at mainbus0: 750 (Revision 2.3), ID 0 (primary)
> > cpu0: HID0 8290c0a4<EMCP,ECLK,DOZE,DPM,ICE,DCE,SGE,BTIC,BHT>
> > cpu0: 500.00 MHz, no-parity 1MB WB L2 cache (PB SRAM) at 1:1 ratio
> >
> > instead of just :
> >
> > cpu0 at mainbus0: 750 (Revision 2.3), ID 0 (primary)
> > cpu0: HID0 8290c0a4<EMCP,ECLK,DOZE,DPM,ICE,DCE,SGE,BTIC,BHT>
> > cpu0: 500.00 MHz
> >
> >
> > Now, my question is, how do I make the processor run at its rated 1GHz
> > speed, instead of 500mhz? In Mac OS, it defaults to 500mhz, unless I
> > use Powerlogix' CPU Director to set it to 1000mhz.
> >
> > I noticed that when trying linux on it, using BootX, it would get the
> > speed set by the CPU Director software. If I booted without the
> > extensions, and didn't set the CPU speed, and then boot in linux using
> > BootX, i'd get about 994 bogomips. If i let the extensions load
> > (therefore loading my 1ghz setting), and then boot linux with BootX,
> > I'd get around 1998 bogomips.
> >
> > A little sorting benchmark showed me that it was really twice as fast
> > if I had the correct speed set under mac os prior to loading linux.
> >
> > So back to my question, is there a way to get my processor running at
> > the speed it was made for?
> >
> > Best Regards,
> >
> > Francis Koclas
> >
> >
> > !DSPAM:42d39d6284506235120822!
> >
>=20
>