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[Alex Deucher]

On Fri, Feb 25, 2011 at 9:38 AM, Phillip Susi <psusi at cfl.rr.com> wrote:
> On 2/24/2011 6:03 PM, Jerome Glisse wrote:
>> We don't have source of firmware, only nouveau is reverse engineering
>> the nvidia one.
>
> Then where does the firmware come from?  I've been glancing at the AMD
> documentation for the R600 and I'd like to figure out why the firmware
> seems to be running in an infinite loop without ever halting, and
> driving the temperature of my card over 80 C, but I need the original
> assembly code for that.

The CP firmware has nothing to do with the temperature.  The CP
firmware is just a packet parser for reading in command buffers and
programming the register backbone.  Just alike a CPU, the GPU runs at
whatever speed it's clock is set to.  You can manually force lower
power states using sysfs.  See the power management section of this
page:
http://wiki.x.org/wiki/RadeonFeature

Alex

>
>>> 2)  What is a "fence"?
>>
>> It's what it means, it tell the cpu when the gpu reached some point in
>> command stream or resource usage so we know we can free or move memory
>> that was previously in use. Or simply to know when gpu is done doing
>> somethings.
>
> So it is kind of like a barrier in the IO world?  You put a dozen
> commands into the pipeline and then a fence, and when they all complete,
> the fence gives you feedback so you know?
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