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[Garry Hurley]

I am going to have to get caught up on the development chain.  I dropped off
for a while while I pursued my MS degree and concentrated on paying the
bills, but I am going to have to get back into the thick of coding.  I am
going through withdrawal. Management courses and systems administration
tasks are enough to drive any good developer to blog on facebook.

On Fri, Feb 25, 2011 at 3:56 PM, Dave Airlie <airlied at redhat.com> wrote:

> On Fri, 2011-02-25 at 15:42 -0500, Phillip Susi wrote:
> > On 2/25/2011 3:03 PM, Dave Airlie wrote:
> > > How do you know its running in an infinite loop?
> >
> > Because the gpu temperature is rising to over 80 C, so it is busy doing
> > something.  And this is booting with init=/bin/bash, so NOTHING is
> > running that could be keeping it busy.
>
> So you made an assumpution you knew how graphics cards worked and
> derived a theory, unfortunately the assumption was wrong.
>
> a GPU doing nothing still runs at a high clock speed, clocking the
> memory bus for the video RAM at full tilt. We don't have reliably
> dynamic power management yet so at the moment manual clock switching is
> all we have.
>
> Even if the CP was running in a tight loop it consumes no power compared
> to the memory interfaces.
>
> >
> > I had been under the impression that since ati/amd started releasing
> > documentation a few years ago that the mesa driver had managed to
> > implement its own firmware.  I sounds more like it has ripped the
> > firmware out of the proprietary driver and reverse engineered the
> interface?
>
> Yes and no. AMD supplied firmware from their driver with the interfaces
> documented like they have done since r100. You could write your own
> microcode after you RE and write an assembler for the CP core, but so
> far nobody has done this and we have a lot of other areas to improve
> before most of the developers would care.
>
> Dave.
>
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