BeagleBone Black: Increase CPU frequency from 800MHz to 1GHz

[Ian Lepore]

On Thu, 2014-04-10 at 06:05 +0300, Sulev-Madis Silber (ketas) wrote:
> On 2014-04-03 04:05, Ian Lepore wrote:
> > On Thu, 2014-04-03 at 08:08 +0800, Xuebing Wang wrote:
> >> Hi community,
> >>
> >> I am working on a small project to increase AM335x Cortex-A8 MPU 
> >> frequency from 800MHz to 1GHz.
> >>
> >> Would you please point to me which tree should I base my work on? Is it 
> >> current?
> >>
> >> I did notice that there is "projects/armv6", svn log under sys/arm/ti 
> >> shows the latest commit is "2012-08-15"
> >>
> > 
> > Definitely use -current.  That projects branch was where the initial
> > armv6 work was done long ago, but that was all merged to 10 and has now
> > evolved into 11-current.
> > 
> > I think very many Beaglebone users will be interested in your work,
> > including me!
> > 
> > -- Ian
> 
> I worry that I might need heatsink on SoC when running 1GHz... I hope
> this thing has proper thermal downscaling or other means of protection.
> At 500MHz and under load, it's already too warm... the thing was sitting
> on table with SoC side up. The original idea of running it inside
> enclosed box doesn't seem so good anymore...

On what basis are you declaring it "too warm"?  Did you use an IR
thermometer or something?  The datasheet gives lifetime ratings with a
junction temperature of 90c, I'll bet you're nowhere near that.

-- Ian